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DOEPFER A-100 Owner's Manual

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Table of Contents

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Download this manual See also: User Manual, Manual
SYSTEM A - 100
Owner's Manual
doepfer Musikelektronik Gmbh

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Summary of Contents for DOEPFER A-100

  • Page 1 SYSTEM A - 100 Owner’s Manual doepfer Musikelektronik Gmbh...

  • Page 2: Important Safety Notes

    The A-100 must never be operated outdoors but only by a qualified person who will follow the valid safety in dry, closed rooms. Never use the A-100 in a humid instructions. Every modification should becarried or wet environment nor near inflammables.
  • Page 3 System A - 100 Important safety notes doepfer ment in a humid or wet environment nor near be disconnected if it is not used for any substantial inflammables. period. If there is any damage the cables must be • Do not use this instrument in damp environments, repaired or replaced by an authorized person •...

  • Page 4: Table Of Contents

    Because the A-100 is a modular system, 3.2 Signals in the A-100 ....... 8 each module has its own separate manual, which can be inserted into this ring-binder. 3.3 The System Bus in the A-100 ....9 3.4 Integrating the A-100 with MIDI ... 11...

  • Page 5: About This Manual

    Chapter 9 (Appendix) deals with installing an extra 5V power supply, for modules which require this additional voltage. If this is your first time using the A-100, please make sure you are familiar with all the safety in- Detailed descriptions of the individual modules fol- structions (eg.

  • Page 6: Introduction

    Each unique In the A-100, Doepfer have strarted in 1994 a capable sound has to be puzzled out, and may never be exactly and versatile analog modular synthesizer, built in the repeated.

  • Page 7: Important Notes

    A-100 frame (220 V to 240 V / 50 Hz or 110 to 120 (monitors, computers, etc.), to avoid the possibility of mutual interference.
  • Page 8 System A -100 doepfer Fuse values for different mains voltages and power supplies Type of power supply A-100NT12 A-100PSU2 (standard power supply, 650 mA output (power supply with ring core/toroid Mains voltage current) transformer and 1.2A output current) 630 - 800 mA time lag (slow blow)

  • Page 9: Overall Design

    2. Overall design 2.1 Introduction 3 HU The A-100 modular system is based on a standard 19” rack system A-100 G into which individual Modules can be fitted in any chosen layout. The rack system (see Fig. 1) conforms to the 19”...

  • Page 10: Installing Modules

    Important: you going ahead and installing them. Read on! Before you install a module into the rack D First of all, take the A-100’s plug out of the wall system: socket. D Calculate the total current requirement D Plug the supplied ribbon cable into the module’s...
  • Page 11 (see in Fig. 3). D Now plug the system A-100 back into the main Check very carefully that it is connected so power supply, and switch it on. that the coloured marking on the ribbon cable is at the bottom of the bus connector D Test out the newly installed module.

  • Page 12: Interconnecting Modules

    2. Overall design System A - 100 doepfer A-118 A-110 A-120 VCF 1 A-130 VCA-LIN. NOISE / STANDARD VCO RANDOM LOW PASS FILTER In this case, double-check the connections, making SYNC White Range CV 1 CV 1 Blue completely sure that the ribbon cable is the right Freq.

  • Page 13: Signal Flow In The

    System A - 100 3. A-100 signal flow doepfer 3. Signal flow in the A-100 Low Pass Filt er Input Output Output P it ch 3.1 The Principles of Voltage Control What makes analogue synthesizers (and modular sy- stems in particular) special is that the important para-...

  • Page 14: Signals In The A-100

    As well as modules which can be affected by voltage 3.2 Signals in the A-100 control, there are other modules like the ADSR and In the System A-100 there are three types of signal: LFO which themselves produce voltages to control other modules.

  • Page 15: The System Bus In The A-100

    It also carries the internal control system waveform shoots up from 0 V to +5V/12 V. The A-100 (INT.GATE and INT.CV), which some of the modules modules usually output +12V, but the corresponding (such as the VCO A-110, or ADSR A-140) can tap into.
  • Page 16 CV/gate leads, the A-100 BC. This is how you go about it: D Remove the A-100 from the electrical supply. D Remove Jumpers J1 and J2(see p.9) from the upper (see Fig. 8 !) and lower (see Fig. 8 ") ➀...

  • Page 17: Integrating The A-100 With Midi

    3.4 Integrating the A-100 with MIDI VC Modules like the A-141 VC-ADSR and A-147 To link the A-100 into a MIDI system, you can use VC-LFO can be controlled via the A-190-1 or A-190-2, external MIDI interfaces like our MCV4, MSY2 or so that, for instance, a continuous MIDI controller can MCV24.
  • Page 18 3. A-100 signal flow 3. A-100 signal flow System A - 100 System A - 100 doepfer doepfer...

  • Page 19: Bs Basic Systems

    System A - 100 4. A-100 Basic System doepfer 4. A-100 Basic Systems Pos. Quantity Module Function A-110 It’s not in the nature of modular systems to have hard and fast rules about which modules should be inclu- A-114 Dual Ring Modulator ded.
  • Page 20 System A - 100 4. A-100 BS Basic system doepfer...

  • Page 21: Accessories

    System A - 100 5. Accessories doepfer Part Description A-100BUS Separate system bus One bus board with 14 connectors for connecting modules, 3 control LEDs (+12,-12,+5V) A-100AD5 5V Low cost adapter Additional power supply producing +5 V / 100 mA; can be connected to any free socket on the system bus board.
  • Page 22 Contains the schematics, silk screens, parts lists, assembly, test, basic principles and adjust- A-100SM ment instructions of all currently available modules. The words (e.g. assembly instructions) are in German language but schematics, components overlays and parts lists are international. Available only to A-100 customers. Subject to change without notice...

  • Page 23: Items Included As Standard

    System A - 100 6. Standard items included doepfer 6. Items included as standard A-100G3/G6 - Rack System 3HU/6HU • Rack system, completely assembled, including The following parts are included in each order: two system bus boards, one 12V, 650mA power supply, internal power cables.
  • Page 24 6. Standard items included System A - 100 doepfer...

  • Page 25: Further Reading

    Duke, Powell, Gleeson, DeFuria, Anderton, et al.) skill with which you can use modular systems like the A-100. Crombie, The Synthesizer & Electronic Keyboard Handbook ISBN 0 330 28681 1, and The New Com-...
  • Page 26 7. Further reading System A - 100 doepfer Specialist books in German Elrad, Heise-Verlag Hannover Electronic Musician, Polyphony Publishing Co., Dellmann / Thewes, Synthesizer-Handbuch, Musik Oklahoma City / USA Media / Augsburger Druck- und Verlagshaus, 1985 Electronics and Music Maker / Music Technology, Enders, Die Klangwelt des Musiksynthesizers, Cambridge, England.

  • Page 27: Module Overview

    Note: Not for all modules user manuals are available. In these cases please refer to the detailed module de- The table may be used for planning and arranging an scription on our website www.doepfer.com A-100 system regarding to need of space and current. Width Current Current@5V...
  • Page 28 8. Module Overview System A - 100 doepfer Module Width Curr. Curr.@5V Description Multitype Morphing Filter A-107 voltage controlled multitype filter with 36 different filter types and morphing feature 6/12/24/48 dB Low Pass / Band Pass A-108 voltage controlled low pass (ladder type) with 4 different slopes and bandpass...
  • Page 29 8. Module overview System A - 100 doepfer Module Width Curr. Curr.@5V Description External Input / Envelope Follower A-119 Input module for external audio signals, includes envelope follower and gate generator 24 dB Low Pass 1 A-120 voltage controlled 24 dB low pass (Moog type)
  • Page 30 8. Module Overview System A - 100 doepfer Module Width Curr. Curr.@5V Description VUV - Voiced / Unvoiced Detector (module no longer available) A-129-5 module for recognition of "voiced/unvoiced" speech VCA - Voltage Controlled Amplifier A-130 voltage controlled amplifier with linear response...
  • Page 31 8. Module overview System A - 100 doepfer Module Width Curr. Curr.@5V Description A-138 Mixer , mixer for audio or control voltages 10/20 a/b/c (a: linear or b: logarithmic controls or c: polarizing mixer) Manual Crossfader / Effect Insert A-138d...
  • Page 32 8. Module Overview System A - 100 doepfer Module Width Curr. Curr.@5V Description Quad ADSR A-143-2 Four ADSR envelope generators with EOA/EOD/EOR gate outputs and retrigger feature Quad LFO A-143-3 Four LFO modulation oscillators with triangle, rectangle and saw outputs, range switch...
  • Page 33 8. Module overview System A - 100 doepfer Module Width Curr. Curr.@5V Description Enhanced Sequencer Controller A-154 Expansion module for A-155, adds additional running modes and features to A-155 Analog / Trigger Sequencer A-155 8 step analog and trigger sequencer...
  • Page 34 8. Module Overview System A - 100 doepfer Module Width Curr. Curr.@5V Description Dual Slew Limiter A-170 two independent portamento controllers or integrators VC Slew Limiter A-171-1 voltage controlled portamento controller/integrator VC Slew Limiter / Processor / Generator A-171-2 licence copy of the SERGE VC Slew Limiter...
  • Page 35 8. Module overview System A - 100 doepfer Module Width Curr. Curr.@5V Description Switched Multiple A-182 eight sockets that can be switched to one of two busses or turned off Bus Access Module A-185-1 module for access to bus signals CV and gate...
  • Page 36 Analog display (moving coil instrument with back light), 3 display modes LCD Scope (module no longer available) A-197-2 kit without the scope to install a Velleman LCD scope into the A-100 system Trautonium / Ribbon-Controller A-198 Trautonium manual resp. ribbon controller, made of module + manual...

  • Page 37: Appendix

    The 5V power supply needs to be mounted near to the main power input, on the blank upper back panel with Some A-100 modules, for instance the A-113, A-190 or four stand-offs, nuts, serrated washers, and bolts. A-191, need an extra 5 V power supply, as well as the Newer back panels (about since summer 1999) are standard one.
  • Page 38 9. Appendix System A - 100 doepfer t o t he (black ) blue connect ors of f rom m ains blue t he bus board inlet +5 V black (re d) black or brown black or brown black blue blue Fig.
  • Page 39 To install the AD5, do the following: • The current for the modules that require a 5V supply doesn’t exceed 100 mA (e.g. only one A-190 Isolate the A-100 rack from the mains power sup- or A-191) ply by removing the main plug.
  • Page 40 9. Appendix System A - 100 doepfer The fins of the heat sink should be facing to the right. It’s vital to make certain that the 16-way plug and socket marry exactly, and aren’t displaced up or down a pin, or to the left or right.

  • Page 41: Using The Mini Power Supply/Bus

    A-100 manual, main introduction, chapter 3, ‘The 9.3. Using the mini power supply/ A-100 signal flow’.). The A-100 MNT is supplied as standard with an exter- 9.3.1. Introduction nal power supply, which has to be connected to the socket on the MNT’s circuit board.
  • Page 42 9. Appendix System A - 100 doepfer 9.3.2. A-100 MNT - Overview ➀ ➁ Controls: In- / Outputs: 1 LED : LED indicator for +12 V supply. ! BU 1 : Input for external power supply (7 ... 9 V AC) 2 LED : LED indicator for -12 V supply.
  • Page 43 System A - 100 9. Appendix doepfer 9.3.3. Controls / indicators " ST 1 ... ST 4 The sockets labelled " on the diagram on p.2 are 1 LED • 2 LED where the modules are connected. LEDs 1 and 2 indicate that the power supply is working properly.
  • Page 44 Connecting the ribbon cable to the bus board. D Now fix the module solidly in its case. D Re-connect the A-100 MNT’s power supply, and then switch on the mains again. D Test out the newly installed module. Fig. 1: Connecting the ribbon cable to the module If it doesn’t seem to be working as expected, imme-...
  • Page 45 System A - 100 A-101-1 doepfer Vactrol Multitype Filter 1. Introduction Module A-101-1 is a special multitype filter based on an idea by Nyle A. Steiner from the year 1974. Injecting an audio signal into different points of a standard low pass filter circuit leads to the three filter types low pass (LP), band pass (BP) amd high pass (HP).
  • Page 46 A-101-1 System A - 100 Vactrol Multitype Filter doepfer Controls: 2. Overview 1 Frequency manual frequency control 2 CVF2 attenuator for FCV input " 3 CVF3 attenuator for FCV input § 4 Emphasis manual resonance control 5 CVQ2 attenuator for QCV input % &...
  • Page 47 VCO) are not possible with vactrol based circuits. Please CVQ2. Input $ CVQ In 1 has no attenuator available. use one of the other A-100 filters for these purposes. By means of a LFO with gradually increasing frequency one The LED right from the resonance control 4 is a rough can discover the maximum modulation frequency that measure of the current filter resonance.
  • Page 48 From about middle position ( ~ 5) combinations that include multiple "~ 5" settings (e.g. distortion appears with A-100 standard audio signals notch) all "~ 5" controls have to be turned to the same (e.g. VCO output).
  • Page 49 System A - 100 A-101-1 doepfer Vactrol Multitype Filter Pay attention that the notch filter does not arise from a )a Out 1 / )b Out 2 (sockets) combination of low pass and high pass only - as one would expect. Even the band pass control has to be These are the two audio outputs of the module.
  • Page 50 A-101-1 System A - 100 Vactrol Multitype Filter doepfer 4. User Examples not yet ready • examples with different audio signals (e.g. 3 parallel VCOs, which have no fixed phase re- lation to each other) • voltage controlled filter panning with module A-134 •...
  • Page 51 Vactrol based circuits are known for their soft low- distortion sound. For details about vactrols please use the corresponding link in the A-101-2 info page on our web site www.doepfer.com. Frequency resp. loudness is controlled manually and by two control inputs.
  • Page 52 A-101-2 System A - 100 Vactrol Lowpass Gate doepfer 2. Overview Controls: 1 F/A manual frequency/loudness control 2 CV2 attenuator for CV input " 3 Level attenuator for audio input § 4 Resonance resonance control 5 Function function toggel LP / LP+VCA / VCA "...
  • Page 53 - especially other A-100 filters or VCAs that do not use vactrols. Fast for higher resonance settings. From about middle posi- attacks or decays (CV = ADSR) or FM effects in audio...
  • Page 54 A-101-2 System A - 100 Vactrol Lowpass Gate doepfer 4 Resonance (control) 5 Function (toggle switch) %a G1 (socket) / %b G2 (socket) In low pass mode this is the resonance control. The resonance function "colors" to the sound and is ad- This group of elements serves to select the desired function resp.
  • Page 55 System A - 100 A-101-2 doepfer Vactrol Lowpass Gate 4. User Examples not yet ready...
  • Page 56 A-101-2 System A - 100 Vactrol Lowpass Gate doepfer...
  • Page 57 (e.g. from a LFO, ADSR, Random Vol- page on our web site www.doepfer.com. tage, Theremin CV, Foot Controller CV ...). For each sub-module a phase shift display (LED) is available.
  • Page 58 A-101-3 System A - 100 Modular Vactrol Phaser doepfer Fig.1: A-101-3 Overall view...
  • Page 59 System A - 100 A-101-3 doepfer Modular Vactrol Phaser preceding stage are mixed and fed into the correspon- 2. Basic principles ding phase shift stage. The module is made of two identical units that differ This modular concept allows the realization of dif- only in the normalling of the sockets (i.e.
  • Page 60 A-101-3 System A - 100 Modular Vactrol Phaser doepfer that no plug is inserted into this socket. To obtain a middle position). On our web site a lot of examples of phaser with more or less stages the output of the corre-...

  • Page 61: Overview

    System A - 100 A-101-3 doepfer Modular Vactrol Phaser 3. Overview " § &...

  • Page 62: Level

    A-101-3 System A - 100 Modular Vactrol Phaser doepfer Controls: Inputs / Outputs: 1 Level: attenuator for audio input ! ! Audio In: Audio input 2 CV: attenuator for CV input " " CV In: Control voltage input 3 Shift: manual phase shift §...
  • Page 63 1 so that the output signal does not distort - unless you than 6 stages) as the phase shift controls of both units want to obtain distortion. For normal A-100 levels (e.g. are supplied with the same control voltage (applied to VCO A-110) distortion appears at about middle position socket "...
  • Page 64 A-101-3 System A - 100 Modular Vactrol Phaser doepfer stages can be obtained. The output of stage 1 does not To obtain different feedback loops the sockets % Polari- lead to a phaser but a high pass or low pass according zer In and &...
  • Page 65 System A - 100 A-101-3 doepfer Modular Vactrol Phaser 5. User Examples ( Stage Out (6x) not yet ready These are the outputs of the phase shifting stages. Applications of these outputs have been described on the preceding pages. The output of stage 6 is normalled to socket §...
  • Page 66 A-101-3 System A - 100 Modular Vactrol Phaser doepfer...
  • Page 67 System A - 100 A-102 • A-103 doepfer 1. Introduction Modules A-102 and A-103 are voltage controlled low-pass filters that filter out the higher parts of the sound spectrum and let lower frequencies pass A-102 CV 1 through. Both filters very similar to the A-120 low-pass filter but sound very different.
  • Page 68 A-102 • A-103 System A - 100 doepfer 2. Overview Controls: 1 Freq.: Cut-off frequency control A-103 VCF 6 2 CV 2: Attenuator for CV at input " 18 dB LOW PASS 3 CV 3: Attenuator for CV at input §...
  • Page 69 System A - 100 A-102 • A-103 doepfer frequencies around the cut-off point f . Close to its 3. Controls maximum setting, the filter becomes so resonant that 1 Frq. it goes into self-oscillation, and starts behaving like a sine wave. You can take advantage of this effect, With this control you adjust the Cut-Off Frequency f and use the VCF as an additional oscillator.
  • Page 70 A-102 • A-103 System A - 100 doepfer different audio sources using A-138 and so on). 4. In / Outputs % Audio Out ! CV 1 Filter output % sends out the filtered signal. Socket CV 1 is the filter’s standard voltage control input, and works on the 1V / octave rule, like the 5.
  • Page 71 (e.g. the vocal-like effects known from Audio the Trautonium). In combination with the subharmo- nic generator A-113 one obtains the complete replica of the Trautonium sound generation. More detailed information about the Trautonium can be found on our internet site www.doepfer.com .

  • Page 72: Resonance Resonance Control

    A-104 System A - 100 Trautonium Formant Filter doepfer 2. TFF - Overview Controls: 1 Input Level : Attenuator for audio input A-104 Trautonium Formant Filter signal (effective for all filters) Input Level Frequency Resonance Mode Level For each VCF: ➀...
  • Page 73 3. Controls The audio inputs of the filters are very sensitive 1 Input Level so that distortion - even with normal A-100 Attenuator 1 adjusts the level of the audio input signal audio levels (e.g. VCO A-110) - may intentio- applied to the audio input socket !.
  • Page 74 • In band pass mode i.e. the band width • In low pass mode i.e. frequency emphasis Res. around the cutoff frequency Self-oscillation - as for some other filters of the A-100 (e.g. A-120, A-121, A-122, A-123 and so on) - is not Freq. Freq.
  • Page 75 More detailed information about the Trautonium and the realization with A-100 modules can be found on our internet site www.doepfer.com . A module that’s related very close to the A-104 is the A-127 Voltage Controlled Resonance Filter.
  • Page 76 A-104 System A - 100 Trautonium Formant Filter doepfer 6. Patch-Sheet The following diagrams of the module can help you A-104 Trautonium Formant Filter recall your own Patches. They’re designed so that a complete 19” rack of modules will fit onto an A4 sheet...
  • Page 77 System A - 100 A-105 doepfer As the modules A-105 and A-122 are identical with regard to operation and functions and differ only in the sound because of the different filter circuits (SSM2044 resp. CEM3320) both modules are combined in one...
  • Page 78 A-105 System A - 100 doepfer...
  • Page 79 CV feedthrough …). But the A-106-1 has a lot of character – probably much more than any other filter of the A-100 – and is able to generate filter sweeps which are not possible with any other filter.
  • Page 80 The sockets are normalled, i.e. A-100 system, please refer to the frequency the signal applied to the LP input is available for the HP...
  • Page 81 90 degree phase shift). For better the HP control leads to different filter results. In the notches and band passes other A-100 filters should second case there is no difference, if the + or - range of be used - or two A-106-1 patched in series (band the HP control is used.
  • Page 82 X-treme Filter A-106-1 System A-100 DOEPFER DOEPFER DOEPFER DOEPFER Low pass (no resonance) High pass (no resonance) Pseudo Band pass (no resonance) Pseudo Notch (no resonance) Low pass (medium resonance) High pass (high resonance) Fig. 2: A-106-1 Frequency Response Curves...
  • Page 83 The audio inputs are very sensitive to allow even extreme distortion effects, much more than possible for the original Fig. 3 : A-106-1 Clipping functions MS20. The module is equipped with an insert option for the resonance feedback loop. This allows to insert other A-100...
  • Page 84 But the A-106-1 has a lot of jack plug into the high pass input (the two terminals of character - much more than any other filter of the A-100. It is the plug may even be shortened). For this reason a 30...
  • Page 85 “A-101-1 technical details” on control is no longer valid. our website www.doepfer.com (available from the A-101-1 or A-106-1 info page). In this document the basics of the A- 101-1 (Steiner) and A-106-1 ((Xtreme) filters are described.
  • Page 86 X-treme Filter A-106-1 System A-100 DOEPFER DOEPFER DOEPFER DOEPFER 3. Overview Controls: Frequ. : manual frequency control CV2: attenuator for CV2 CV3: polarizer for CV3 6 6 6 6 ! ! ! ! LP Level: low pass audio input attenuator...
  • Page 87 The control scales of the three CV inputs are non-linear, i.e. the sockets LP In and HP In is interrupted. not 1V/octave as CV inputs of many other A-100 modules. Both the LP and the HP audio input are very sensitive. With standard A-100 signals (e.g.
  • Page 88 X-treme Filter A-106-1 System A-100 DOEPFER DOEPFER DOEPFER DOEPFER influence each other. E.g. the waveform generated in self- oscillation mode depends upon the settings of the clipping CL+: positive clipping control controls and the resonance, or self-oscillation is reduced or CL–:...
  • Page 89 A-106-1. With an external voltage (Morph. CV) polarizer, waveshaper/wave multiplier, spring reverb, PLL) the relation between LP and HP is adjusted (e.g. LFO, for special effects. ADSR, sequencer, random or S&H, Theremin). On our web site www.doepfer.com several A-106-1 sound examples are available.
  • Page 90 X-treme Filter A-106-1 System A-100 DOEPFER DOEPFER DOEPFER DOEPFER...
  • Page 91 System A - 100 A-107 doepfer Multitype Morphing Filter 1. Introduction The transition between filters can be soft (morphing) or hard (switching). The morphing time (manual and voltage controlled) defines the transition time between Module A-107 is a completely new voltage controlled...
  • Page 92 A-107 System A - 100 Multitype Morphing Filter doepfer Permanent Memory Audio Out C01 C02 Display Amp. Chain Prog Control Unit Freq. 03 12 Filter Filter Unit Step S01 S02 S31 S32 Res. CV 1 Man Value CV 1 Clk Res...
  • Page 93 System A - 100 A-107 doepfer Multitype Morphing Filter 2. Basic principles Provided that a clock signal is applied to the Step Clock input the clocked mode is activated. In this mode each positive transition of the clock signal trig-...
  • Page 94 A-107 System A - 100 Multitype Morphing Filter doepfer 3. Overview ➆ ➀ ➉ — ➇ ➅ ˜ ➈ ™ š –...
  • Page 95 System A - 100 A-107 doepfer Multitype Morphing Filter Programming Unit Controls: Filter Unit Controls: 1 Display: 3 digit LED display ! Audio In: audio input of the filter 2 Step: button, calls up display mode "Step" " Freq.: two CV inputs with/without attenuator, 3 Filter: button, calls up display mode "Filter"...
  • Page 96 A-107 System A - 100 Multitype Morphing Filter doepfer 4. Programming Unit Controls The right decimal point is a warning indicator for the functions CHAIN and PRG and is blinking as soon the button 4 or 5 is operated (see below).
  • Page 97 System A - 100 A-107 doepfer Multitype Morphing Filter 3 Filter D Operate the Step button 2 and select the desired step (e.g. S01) within the current filter chain Operating this button calls up the display mode that (working buffer) by using the value control 6.
  • Page 98 A-107 System A - 100 Multitype Morphing Filter doepfer 4 Chain After about 2 seconds the chain is copied from the Operating this button calls up a chain from the me- non-volatile memory into the working buffer. mory, i.e. the chain is copied from the non-volatile memory into the working buffer.
  • Page 99 System A - 100 A-107 doepfer Multitype Morphing Filter If you release the button while the display shows 7 Step "PRG" the store procedure is interrupted and the This group of controls serves to address a step within right decimal point flashes slowly again.
  • Page 100 A-107 System A - 100 Multitype Morphing Filter doepfer 8 Step Clock The step reset input is also helpful to synchronize "filter sequences" by applying a sequener generated reset The positive transition (low to high) of a Clock signal signal to this input (e.g. .
  • Page 101 More details can be found in the manuals of audio signal has to be fed in. The attenuator controls other A-100 filters (e.g. A-121, A-123, A-124, A-108, the input level of the signal to be filtered. If the filter’s A-105/122).
  • Page 102 The filters 19...36 do not support self-oscillation. Even the effect of resonance and self-oscillation is treated more detailed in the manuals of other A-100 filters (e.g. A-121, A-123, A-124, A-108, A-105/122). $ Amp.
  • Page 103 A-160 to obtain a smaller clock frequency) zed with other A-100 modules (e.g. the "fast food filter" • Rhythmical advance by means of clock divider no. 09, look at response curve to understand the name and sequencer A-160/161, combined e.g.
  • Page 104 A-107 System A - 100 Multitype Morphing Filter doepfer (see first item above), Morphing D Turn up slowly the morph control to find out how the But the real fun arises with the morphing features of switching between the two filters turns more and the A-107.

  • Page 105: Filter Types

    (e.g. 14...16...18 10...16...22) The filters are divided into two groups. The filters of D Any control voltage sources of the A-100 can be the first group (01...18) allow self-oscillation. The used to control the 5 parameters of the A-107.
  • Page 106 A-107 System A - 100 Multitype Morphing Filter doepfer 24 dB Lowpass 12 dB Lowpass Bandpass Asymmetric Bandpass 1 (6 dB LP + 6 dB HP) (12 dB LP + 6 dB HP) Asymmetric Bandpass 2 Bandpass Notch + 6 dB Lowpass...
  • Page 107 System A - 100 A-107 doepfer Multitype Morphing Filter Lowpass + 2 shifted Bandpas- 2 shifted Bandpasses with dif- Lowpass + Notch + Highpass Lowpass + Notch II ses with different amplitudes ferent amplitudes Lowpass + Soft Notch + Band-...
  • Page 108 A-107 System A - 100 Multitype Morphing Filter doepfer 12 dB Notch Allpass (lower frequencies at- Notch + Highpass Soft Notch + shifted Bandpass tenuated) Allpass (higher frequencies at- Highpass with "step" "Wave" filter Lowpass + Soft Notch + Band-...
  • Page 109 12dB 24dB 48dB The A-108 features an external feedback input that enables the insertion of additional modules into the feedback path. The audio input is very sensitive so that distortion is possible even with normal A-100 levels.
  • Page 110 A-108 System A - 100 doepfer 6/12/24/48 dB Low Pass 2. VCF 8 - Overview Controls: 1 Freq. : Manual frequency control A-108 VCF 8 2 CV 2 : Attenuator for frequency control voltage at input § / CV2 6/12/24/48 dB Lowpass...
  • Page 111 If you want to use ble even with normal A-100 levels. Distortion appears the filter as a sine wave oscillator no audio signal about from position 5 with normal A-100 audio levels. should be fed in (or control 4 to zero).
  • Page 112 A-108 System A - 100 doepfer 6/12/24/48 dB Low Pass Fig. 2 Fig. 4 Fig. 2: Filter response curves (minimal resonance) Fig. 3: Filter response curves (middle resonance) Fig. 3 Fig. 4: Filter response curves (high resonance) For all figures:...
  • Page 113 System A - 100 A-108 doepfer 6/12/24/48 dB Low Pass If you patch one or more modulation sources (e.g. 4. In / Outputs LFO, ADSR, Random, S&H, Theremin, Ribbon, MIDI- to-CV) to these inputs, the cut-off frequency of the ! Audio In filter will be modulated by the sum of the control This is the filter’s audio input socket.
  • Page 114 A-144. That way it is possible to other filters of the A-100 system. sweep the cut-off slope from 6 ... 48dB (fig. 5, ) with...
  • Page 115 System A - 100 A-108 doepfer 6/12/24/48 dB Low Pass A-144 A-135 A-108 VCF 8 VC-Mixer Audio Level CV Out Audio In Audio ext. Char. CV 1 Mod. CV 2 ext. Freq. ext. 12dB CV 2 CV 2 Mod. 1 CV 3 Freq.
  • Page 116 42 and 48 to out 4. For details please refer On the pc board 4 double row pin headers are avai- to the A-100 service manual (additional charge). lable (see picture on next page). The positions of the...
  • Page 117 System A - 100 A-108 doepfer 6/12/24/48 dB Low Pass 6 | 12 dB 18 | 24 dB 30 | 36 dB 42 | 48 dB output 1 output 2 output 3 output 4...
  • Page 118 A-108 System A - 100 doepfer 6/12/24/48 dB Low Pass 6. Patch-Sheet The following diagrams of the module can help you A-108 VCF 8 A-108 VCF 8 recall your own Patches. They’re designed so that a 6/12/24/48 dB Lowpass 6/12/24/48 dB Lowpass...
  • Page 119 System A - 100 A-109 doepfer VC Signal Processor 1. Introduction The main VCA has a combined exponential/linear control scale: exponential from about 0...+200mV (corresponding to about -100dB ... -20dB attenuation), Module A-109 is a voltage controlled audio signal and linear from about 200mV...+5V (corresponding to processor containing the components VCF, VCA and about -20dB...0dB).
  • Page 120 A-109 System A - 100 VC Signal Processor doepfer 2. Overview A-109 VC Signal Processor 24 dB Low Pass / VCA / Panning ➁ CVF2 CVF1 CVF1 Frq. VCF Out — ™ ➂ VCA In Res. CVQ2 CVQ1 CVQ1 š...
  • Page 121 System A - 100 A-109 doepfer VC Signal Processor Controls: In- / Outputs: 1 Level : Attenuator for input signal at socket ! ! Audio In 1 • (Audio In 1) Audio In 2 : VCF audio inputs 2 Frq. : Manual control of filter frequency "...
  • Page 122 A-109 System A - 100 VC Signal Processor doepfer Audio Audio Audio Audio In 1 Audio In Audio In Out L Audio Audio In 2 man. man. Out R Amplitude Panning man. CV 1 CV 1 Frequency CV 2 CV 2...
  • Page 123 The audio input is very sensitive so that distortion is possible even with normal A-100 levels. Distortion appears about from po- sition 5 with normal A-100 audio levels. Freq. 2 Frq.
  • Page 124 A-109 System A - 100 VC Signal Processor doepfer • exponential 4 Res. from about 0...+200mV (corresponding to about -100dB ... -20dB attenua- With this control you adjust the filter’s resonance (or tion) emphasis or Q factor) - the parameter which emphasi- •...
  • Page 125 System A - 100 A-109 doepfer VC Signal Processor The actual panning setting results from the sum of the 4. In- / Outputs manual control 8 and the external control inputs CVP1 and CVP2. ! Audio In 1 • Audio In 2 The gains of the panning VCAs are complementary, These are the filter’s audio input sockets.
  • Page 126 A-109 System A - 100 VC Signal Processor doepfer If you patch a modulation source (eg LFO, ADSR) to $ VCF Out these inputs, the cut-off frequency of the filter will be Socket % is the audio output of the filter. The socket modulated by the voltages, i.e.
  • Page 127 As the A-109 is nothing but a collection of modules that trol the level of voltage - the intensity of panning are still available in the A-100 please look at the modulation - with the attenuator 9. examples in the manuals for the A-100 filters (e.g.
  • Page 128 A-109 System A - 100 VC Signal Processor doepfer 6. Patch-Sheet The following diagram of the modules can help you A-109 VC Signal Processor recall your own Patches. They’re designed so that a 24 dB Low Pass / VCA / Panning complete 19”...
  • Page 129 System A - 100 A-110 doepfer 1. Introduction Module A-110 (VCO) is a voltage-controlled oscilla- A-110 SYNC tor. This VCO’s frequency range is about ten octaves. It can produce four waveforms simultaneously: square, Range CV 1 sawtooth, triangle, and sine wave.
  • Page 130 A-110 System A - 100 doepfer 2. VCO Overview Controls: 1 Range: 5-position Octave or Footage switch 2 Tune: Fine tuning control STANDARD VCO 3 CV 2: Attenuator for voltage at CV 2 ( ) SYNC Range ➀ 4 PW:...
  • Page 131 System A - 100 A-110 doepfer 3. Basics strong, the third is one third, the fourth a quarter, and Module A-110 puts out four waveforms simultaneously. so on (see Fig. 1). All these signals have the same pitch, since all are Sawtooth waves are ideal for synthesizing sounds controlled by the same voltages present at inputs "...
  • Page 132 A-110 System A - 100 doepfer A symmetrical Pulse wave (i.e. an exact square Triangle wave wave, with a pulse width of 50 %), has only odd A triangle wave (VCO Output () is poor in upper harmonics of its fundamental (see Fig. 3) and produ- harmonics, and sounds softer and more mellow.
  • Page 133 System A - 100 A-110 doepfer Sine Wave Frequency Modulation (FM) Sine waves are pure waves: they just contain the Because the frequency of the VCO is controlled by the fundamental, without any harmonics (see Fig. 5). They voltages at inputs " and §, Frequency Modulation is...
  • Page 134 A-110 System A - 100 doepfer 4. Controls 3 CV 2 The pitch of the VCO is controlled by the voltages 1 Range present at inputs " and §. The amount the control voltage at input § affects VCO pitch can be controlled Footage (the octave of the fundamental) is controlled with Attenuator 3 (see also §).
  • Page 135 System A - 100 A-110 doepfer 5. In / Outputs Master ! SYNC f > f Slave Socket ! is the Sync Input for the VCO. What sync means in this context is that the waveform of one VCO Slave with Hard Sync ("Slave") is locked to the waveform of another VCO...
  • Page 136 A-110 System A - 100 doepfer Input " is normally connected to a control voltage $ PW CV 1 • % PW CV 2 governing pitch (for instance from a MIDI-CV interface, Sockets $ and % are the Voltage Control Inputs for or a master keyboard with a 1V / octave output).
  • Page 137 System A - 100 A-110 doepfer When you try this out (see Fig. 8), start off with sine 6. User examples waves, and slowly raise the modulation frequency from the sub-audio into the audio range. FM in the audio range...
  • Page 138 A-110 System A - 100 doepfer Tone colour changes using VCO SYNC Very interesting sounds can be created by syncing together two VCOs (see p.7), using sub-audio fre- quency modulation (eg. with an LFO) on the slave VCO, and a mixer to add to the excitement by subtly varying the level of each VCO (see Fig.
  • Page 139 System A - 100 A-110 doepfer Pulse Width Modulation VCO and DIVIDER If you modulate the pulse width of a square wave with Using a divider like the A-115, you can synthesize up to three square-wave sub-octaves, and mix them with the an LFO or ADSR (Pulse Width Modulation, or PWM), original signal at any level you choose.
  • Page 140 A-110 System A - 100 doepfer 7. Patch-Sheet The following diagrams of the module can help you recall your own Patches. They’re designed so that STANDARD VCO STANDARD VCO a complete 19” rack of modules will fit onto an A4...
  • Page 141 System A - 100 A-111 doepfer VCO 2 1. Introduction Module A-111 (VCO 2) is a voltage controlled oscil- lator. A-111 CV 1 The VCO has a range of about 12 octaves, and High End VCO CV 2 produces four waveforms simultaneously: pulse Range (rectangle), sawtooth, triangle and sine waves.
  • Page 142 A-111 System A - 100 doepfer VCO 2 2. VCO 2 - Overview Controls: 1 Range : 7-position switch for octave selection A-111 VCO 2 2 Tune : Control for coarse tuning HIGH END VOLTAGE CONTR. OSCILLATOR 3 Fine :...
  • Page 143 System A - 100 A-111 doepfer VCO 2 3. Basics 100% 3.1 Waveforms Module A-111 puts out four waveforms simulta- neously. All these signals have the same pitch, since all are controlled by the same CVs at inputs ! and " .
  • Page 144 A-111 System A - 100 doepfer VCO 2 ally - the third harmonic is a ninth as strong, the fifth 100% 1/25, and so on. 100% Harmonics ➨ Fig. 3: Harmonic spectrum of a true square wave Harmonics ➨ The further the pulse width deviates from 50% (see Fig.
  • Page 145 System A - 100 A-111 doepfer VCO 2 Sine wave nuously, depending on the incoming voltages at CV1 and CV2. In contrast with the standard VCO module Sine waves are pure waves: they just contain the (A-110), the A-111 provides two types of frequency fundamental, without any harmonics (see Fig.
  • Page 146 A-111 System A - 100 doepfer VCO 2 Completely different sounds will emerge, though, if the 500 Hz produce side bands at 400 Hz and 600 Hz). modulation frequency is in the audio range. When you try this out for the first time, start off with sine waves, and slowly raise the modulation frequency from the sub-audio into the audio range.
  • Page 147 System A - 100 A-111 doepfer VCO 2 talk about ‘digital’ sounds. After being superceded in popularity by ‘sample & synthesis’ technology in the late 80s - and analog or analog-like instruments in the 90s - it is now appreciated again as a very useful source of timbres.
  • Page 148 A-111 System A - 100 doepfer VCO 2 The other important influence on the end result is the intensity of the modulation - in other words, how high the Linear FM control 7 is set. 3.3 Synchronisation What synchronisation means in this context is that the waveform of one VCO (‘slave’) is locked to the wa-...
  • Page 149 System A - 100 A-111 doepfer VCO 2 If it’s the other way round, and the slave is at a higher frequency than the master (f < f ) then it still follows Slave-Signal the master’s frequency (Fig. 13 b: the slave’s cycle T matches the master VCO’s cycle), but the waveform is...
  • Page 150 A-111 System A - 100 doepfer VCO 2 Soft Sync Slave-Signal In contrast with hard sync, soft sync produces no change in the waveform of the slave VCO. The master VCO simply forces the slave’s waveform direc- tion changes to match its own.
  • Page 151 System A - 100 A-111 doepfer VCO 2 4. Controls 4 CV 2 The pitch of the VCO is controlled by the voltages 1 Range present at inputs ! and ". The level of CV input " can be controlled with the Attenuator 4 .
  • Page 152 A-111 System A - 100 doepfer VCO 2 5. In- / Outputs Input " is used for exponential FM in the sub-audio as well as the audio range; the level of its signal sent ! CV 1 • " CV 2 to the VCO is controlled by attenuator 4.
  • Page 153 System A - 100 A-111 doepfer VCO 2 $ H-Sync • % S-Sync • ( • ) • = Sockets $ and % are the synchronisation inputs. Socket $ is for hard sync, and socket % for soft sync. Sockets / to = are the VCO outputs, each sending out a different waveform: rectangle wave (/), &...
  • Page 154 A-111 System A - 100 doepfer VCO 2 7. Appendix The diagram on the right shows the layout of the A-111 main circuit board. If you want to disconnect the normalled CV 1 socket from the system bus INT. CV line (see also page 12), remove Jumper J1 from the circuit board.
  • Page 155 The module has the characteristic “grungy“ sound MIDI In of the early 8 bit Samplers and is a welcome addi- tion to the A-100’s sound generating capabilities. But it should not be compared with the polyphonic 16 MIDI Out Modus bit MIDI samplers available on the market.
  • Page 156 A-112 System A - 100 Sampler doepfer Sampling mode source A-176) or it may come from any other voltage source (e.g. LFO, ADSR, Sequencer). Both record and In sampling mode the incoming audio signal is sam- play take place in a loop whereby the complete page pled with a sampling frequency that is controlled is always passed through.
  • Page 157 System A - 100 A-112 doepfer Sampler 2. SAMPLER Overview Controls: 1 Atten. : Attenuator for Audio/Wave CV Input ! A-112 SAMPLER 2 Tune : Manual control for Sampling fre- VC Sampler / Wavetable Osc. quency MIDI Out 3 Run : Gate indicator LED / overload ➄...
  • Page 158 A-112 System A - 100 Sampler doepfer The voltage generated with the tune control 3. Controls is internally added to the voltage at input ". This input is normally used to control the 1 Atten. pitch of the sampler/wavetable oscillator in...
  • Page 159 System A - 100 A-112 doepfer Sampler 5 5 5 5 6 6 6 6 7 7 7 7 Function 5 Switch • 6 Switch • 7 Switch not implemented Loop With the 3-position switches 4 to 6 the operating mode is selected.
  • Page 160 A-112 System A - 100 Sampler doepfer • Normal record mode The pre-listening mode is also used to find out and set the sampling frequency. When record mode is entered (see below) the last sampling frequency in 5 5 5 5...
  • Page 161 System A - 100 A-112 doepfer Sampler A udio Gate = low: Sample The module is waiting for gate = high; LED 3 is off (see fig. 1 - a). Gate = high: Gat e When the gate level changes from low to high Play- back is triggered and the audio signal in the memory bank is played back.
  • Page 162 A-112 System A - 100 Sampler doepfer In this case the record starts again at the first memory as long as the gate level remains low (see fig. 2: loop address. This loop continues (LED 3 on) until gate turns low.
  • Page 163 System A - 100 A-112 doepfer Sampler • Wave record mode Gate = high: When the gate goes high record starts (LED 3 is on). 5 5 5 5 6 6 6 6 7 7 7 7 Audio / Wave-CV In...
  • Page 164 A-112 System A - 100 Sampler doepfer In fig. 3, the CV input is fed from the sine output of a • Wave play mode LFO. The sampling frequency is 32kHz, the LFO fre- quency 21 Hz. The resulting wavetable pages are...
  • Page 165 System A - 100 A-112 doepfer Sampler • Normal dump mode i.e. the next wavetable and the next sampling fre- quency are determined. This continues until the gate 5 5 5 5 6 6 6 6 7 7 7 7...
  • Page 166 A-112 System A - 100 Sampler doepfer During Data transmission via MIDI OUT the The number of the wavetable is determined by the MIDI input and gate are not scanned. There- position of the tune control 2 and the voltage applied fore a new dump cannot be triggered by to CV input ".
  • Page 167 System A - 100 A-112 doepfer Sampler The length of the delay memory is defined by the A udio parameter Len (see below). The maximum length is A udio A-112 A-138 A-112 the complete sampling memory (64kbyte = 65536 bytes). With a sampling frequency of 32 kHz this corresponds to 2 seconds delay time.
  • Page 168 A-112 System A - 100 Sampler doepfer If read and write frequency differ the audio signal is All functions and controls (sampling fre- read out faster or slower and the pitch shift effect quency, length of delay memory ...) are the occurs.
  • Page 169 System A - 100 A-112 doepfer Sampler • Freeze option When gate turns low the freeze option is cancelled and the module returns to the respective effect without 5 5 5 5 6 6 6 6 7 7 7 7...
  • Page 170 A-112 System A - 100 Sampler doepfer right (cw position 10) it corresponds to the whole 4. In / Outputs memory (64 kbyte or 256 pages). During the adjust- ment of Len with the tune control no external voltage ! Audio In / Wave-CV In should be applied to the CV input ".
  • Page 171 The MIDI SysEx message for a sample dump re- quest has the following structure: $ Audio Out 00 20 20 Doepfer SysEx-ID Socket $ is the audio output of the A-112. < bank> bank number (00 : S1, 01 : S2)
  • Page 172 < Wave-Nr., Bit 0 > with other A-100 modules. On top of this the module opens up a huge number of sound experiment possibi- lities – far too many to be covered in this manual.
  • Page 173 System A - 100 A-112 doepfer Sampler The control voltage range 0...+5V corresponds to the Sequencer-controlled wavetable playback 256 tables (0V = table no. 1, +5V = table no. 256). To In the patch in fig. 6 the Analog/Trigger Sequencer...
  • Page 174 A-112 System A - 100 Sampler doepfer Wavetable playback of a normal sample Suggestions for sound experiments: Very interesting sounds can be obtained if a normal • If the slope of the voltage controlling the wavetable sample is played back in wavetable mode - especially is running backwards (e.g.
  • Page 175 System A - 100 A-112 doepfer Sampler Cloc k A-155 VC-ADSR Trig. 1 Clock CV D Gat e Po s t Out 1 S & H Ctrl. 1 Wave- CV In A-112 Po s t Out 2 S & H Ctrl. 2...
  • Page 176 The latest version of the sample dump loader can be found on our internet home- Version 1.2 of this software (see fig. 7) enables bi- page (http://www.doepfer.com) for free directional transfer between A-112 and the PC. Sam- download. ples and waves can be organized and stored on the storage device (e.g.
  • Page 177 System A - 100 A-112 doepfer Sampler fig. 7: A-112 sample dump loader...
  • Page 178 A-112 System A - 100 Sampler doepfer 7. Patch-Sheet The following diagrams of the module can help you A-112 A-112 SAMPLER SAMPLER recall your own Patches. They’re designed so that a VC Sampler / Wavetable Osc. VC Sampler / Wavetable Osc.
  • Page 179 System A - 100 A-113 doepfer Subharmonic Generator 1. Introduction A-113 Module A-113 (Subharmonic Generator) is an addi- tional sound source that derives four independend Subharmonic Generator so-called Subharmonics from an incoming pulse si- Level 8.8. gnal. The module represents the sound generation...
  • Page 180 A-113 System A - 100 doepfer Subharmonic Generator 2. Basic principles The Subharmonic Generator A-113 contains four ti- mes the following elements (see fig. 1) • digital frequency divider (rectangle outputs) with 2-digit display and up/down buttons for divisor adju- stment •...
  • Page 181 System A - 100 A-113 doepfer Subharmonic Generator It becomes apparent that the subharmonics are equi- Subharmonics valent to the tones of the minor chord scale. The subharmonics result from integer division of the frequency of the input signal. By way of contrast the harmonics are equivalent to the tones of the major chord scale.
  • Page 182 A-113 System A - 100 doepfer Subharmonic Generator The term "subharmonic" is not quite correct as the volume foot controller are used to switch between the A-113 outputs are sawtooth waveforms in the 3 mixtures. contrast to the sine waves used in the harmo- nics theory.
  • Page 183 System A - 100 A-113 doepfer Subharmonic Generator Controls: 2. Overview 1 Display : displays the current divisor 2 Up : button to increase the divisor ➃ A-113 data ➂ Subharmonic Generator 3 Down : same to decrease ➁ ™...
  • Page 184 A-113 System A - 100 doepfer Subharmonic Generator 3. Controls 1 Display This is the 2-digit LED display that shows the current value of the divisor. In addition the decimal points of the displays are used to display the current mixture (see fig. 5): •...
  • Page 185 System A - 100 A-113 doepfer Subharmonic Generator 5 Preset 6 Store While button 5 is operated one reaches the preset The store button 6 is used to store presets. The mode (see chapter 2 concerning the term preset). In...
  • Page 186 A-113 System A - 100 doepfer Subharmonic Generator 4. In / Outputs The mixture is displayed with the decimal points (see chapter 3, fig. 5). ! In Socket ! is the subharmonic generator’s audio input. $ Single Out Connect up the signal you wish to use as master Sockets "...
  • Page 187 The controlling modules may be triggered or The replica of the Trautonium sound generation with synchronized (e.g. with a keyboard or sequencer con- the A-100 presents itself as the A-113 contains all the trolled gate) or free running. basic sound source elements of the Trautonium. The...
  • Page 188 A-113 System A - 100 doepfer Subharmonic Generator Fig. 8 : Schematic construction of the Mixtur- Trautonium sound generation (part 2 see next page)
  • Page 189 System A - 100 A-113 doepfer Subharmonic Generator...
  • Page 190 A-113 System A - 100 doepfer Subharmonic Generator A -113 A -135 VC- Mixer Single Audio Out 1 In 1 A udio V CO VC A ext . CV In 1 Tr ig Trig Trig Fig. 9: A-113 as a complex sound source...
  • Page 191 System A - 100 A-114 doepfer Dual Ring Modulator 1. Introduction Module A-114 (Dual Ring Modulator) contains two A-114 separate ring modulators. RING MOD. A ring modulator outputs the product (Multiplication X • X IN Y) of the signals at inputs X and Y. It’s similar to a...
  • Page 192 A-114 System A - 100 doepfer Dual Ring Modulator 2. Dual Ring Modulator - Overview In / Outputs: A-114 ! X In : Signal input RING MOD. " Y In Signal input – X IN § X*Y Out : Output —...
  • Page 193 System A - 100 A-114 doepfer Dual Ring Modulator 3. In / Outputs 4. User examples Basic ring modulation ! X In • " Y In Fig. 1 shows a basic form of ring modulation using two Sockets ! and " are the signal inputs for the A-114.
  • Page 194 (for instance, voices, strings, sax). On the one hand, it’s bringing the level of the external signal up to the A-100’s operating level (round about 5 The example at Fig. 2 shows an audio signal (input via module A-119 "Ext. In") ring modulated with a sine wave.
  • Page 195 System A - 100 A-114 doepfer Dual Ring Modulator “Glissando ring modulation” Use the upper part of the A-170 for this, The patch in Fig. 3. produces some interesting because the diode offset in the lower part wlll sounds. Input two VCOs set to an exact harmonic put the VCO out of tune.
  • Page 196 A-114 System A - 100 doepfer Dual Ring Modulator 5. Patch-Sheet The following diagrams of the module can help A-114 A-114 A-114 you recall your own Patches. They’re designed so RING MOD. RING MOD. RING MOD. that a complete 19” rack of modules will fit onto an...
  • Page 197 System A - 100 A-115 doepfer DIVIDER 1. Introduction Module A-115 (DIVIDER) is a four-way frequency Audio In divider. Orig. The frequency of a signal at the input is halved (half frequency = first sub-octave), quartered (1/4 frequency F / 2 A-115 = second sub-octave), and so on.
  • Page 198 A-115 System A - 100 doepfer DIVIDER 2. DIVIDER - Overview Controls: 1 Orig. : Attenuator controlling the amount of A-115 the original input signal present at the DIVIDER mix output " 2 F / 2 : Attenuator controlling the amount of the first sub-octave present at the mix –...
  • Page 199 System A - 100 A-115 doepfer DIVIDER 3. Controls 5. User examples 1 Orig. A-115 as a "frequency generator" This attenuator controls the amount of the original input signal present in the mix output. With the A-115, you can start out with a VCO’s basic square wave and produce more complex waveforms.
  • Page 200 Fig. 2: Frequency division of external audio The A-119 again has a double task: to bring the external signal up to the level the A-100 needs, so that the divider works properly, and to send voltages to an ADSR. That means that the Threshold control must...
  • Page 201 System A - 100 A-116 doepfer VC Waveform Processor 1. Introduction Module A-116 (Voltage Controlled Waveform Pro- A-116 cessor) provides voltage-controlled dynamic wa- veform modification of audio signals. It can produce new waveforms from the standard VCO shapes, and Lev.
  • Page 202 A-116 System A - 100 doepfer VC Waveform Processor 2. VC Waveform Processor - Overview Controls: 1 Lev. : Input ! amplifier level control A-116 2 Clipping Level : Clipping threshold control VC Waveform Processor 3 CCV : Clipping CV attenuator...
  • Page 203 System A - 100 A-116 doepfer VC Waveform Processor metry VCA is a special amplifier which operates in the 3. Controls amplification range from -1 to +1, so can amplify negative as well as positive voltages (see Fig. 2). 1 Lev.
  • Page 204 A-116 System A - 100 doepfer VC Waveform Processor 1.0 (Input Signal) 5. User examples 0.75 The VC Waveform Processor A-116 is a very complex module, which, especially through the modulation of 0.25 clipping level and symmetry parameters, can give any - 0.25...
  • Page 205 System A - 100 A-116 doepfer VC Waveform Processor • LFO (sine wave) for Symmetry, LFO (square wave) for Clipping Level A-114 Sync • RANDOM for Clipping Level, Modulation wheel for Symmetry A-116 etc. Gate D Try the same experiments with more complex (rich Symm.
  • Page 206 A-116 System A - 100 doepfer VC Waveform Processor v = 1 v = 0.5 Signal after Clipping Input Signal v = 0 Sum Up v = -0.5 v = -1 Fig. 4: Example of how the A-116 processes a...
  • Page 207 System A - 100 A-117 doepfer Digital Noise Generator 1. Introduction Module A-117 (DNG) is a combination module, inclu- A-117 ding a digital noise generator and an 808 source. DNG / 808 The digital noise generator uses random sequences of...
  • Page 208 A-117 System A - 100 doepfer Digital Noise Generator 2. DNG / 808 - Overview Controls: 1 Rate : Pulse rate control for random clock / noise output ! DIG. NOISE/ 808 Source DNG / Rate RND CLK In / Outputs: –...
  • Page 209 System A - 100 A-117 doepfer Digital Noise Generator 3. Controls 4. In / Outputs 1 Rate ! DNG / RND CLK This is used to adjust the pulse rate of the random Output ! ! ! ! produces random clock pulses or digital clocks generated.
  • Page 210 A-117 System A - 100 doepfer Digital Noise Generator type, different settings of the cut-off point and reso- 5. User examples nance amount can lengthen a click into bell-like sounds. Module A-117 is an inexhaustible source of scraping, lip-smacking, bell or other untuned percussion sounds,...
  • Page 211 System A - 100 A-117 doepfer Digital Noise Generator Change the band pass for a high pass filter, put the cut-off to high and the resonance to minimum, and A-138 summon up a hailstorm. A-117 Experiment with different filter kinds, and settings for cut-off and resonance.
  • Page 212 A-117 System A - 100 doepfer Digital Noise Generator "Octave noise" A-121 A-117 Patch the digital noise into an A-115 Audio Divider 2 Oscil. Band and create extra sub-octave bands in the character of the noise. The A-117’s digital noise is an excellent...
  • Page 213 System A - 100 A-118 doepfer NOISE / RANDOM 1. Introduction Module A-118 (NOISE / RANDOM) is (as you might A-118 have guessed) a noise and random voltage genera- tor. NOISE / RANDOM It produces three types of signal: white noise, colo-...
  • Page 214 A-118 System A - 100 doepfer NOISE / RANDOM 2. NOISE / RANDOM - Overview Controls: 1 Blue: Control for blue noise component at A-118 colored noise output " NOISE / RANDOM 2 Red: Control for red noise component at colored noise output "...
  • Page 215 If desired the random voltage can be derived Frequency ➨ ➨ ➨ ➨ from the white noise output. Please refer to the A-100 service manual or contact Doepfer if you want to Fig. 1: Spectra of white and pink noise...
  • Page 216 A-118 System A - 100 doepfer NOISE / RANDOM 5 Random Control Use these two LEDs to keep track of whether the random voltage is positive (+) or negative (-) at any point in time. Their relative brightness also shows amplitude.
  • Page 217 System A - 100 A-118 doepfer NOISE / RANDOM Random arpeggios 5. User examples In this example, momentary random voltages from the The A-118 as wind FX generator A-118’s random output are captured by a Sample & Hold Module which is itself triggered by an LFO.
  • Page 218 A-118 System A - 100 doepfer NOISE / RANDOM 6. Patch-Sheet The following diagrams of the module can help A-118 A-118 A-118 NOISE / NOISE / NOISE / you recall your own Patches. They’re designed so RANDOM RANDOM RANDOM that a complete 19” rack of modules will fit onto an...
  • Page 219 1. Introduction Module A-119 (External Input / Envelope Follower) A-119 Asym. is designed to allow external audio signals to be integrated into the System A-100. It comprises a pre- Ext. In. amp, envelope follower, and comparator. Symm. In Gain The pre-amp has two inputs: an unbalanced input for...
  • Page 220 A-119 System A - 100 doepfer Ext. Input / Envelope Follower 2. A-119 - Overview Controls and indicators: 1 Gain : Control for input signal level A-119 Ext. In. 2 Over-Load : LED overload warning Ext. Input / Env. Follower...
  • Page 221 ! or ", depending on its level. It is amplified by an amount set by the gain control 1, brought up to A-100 internal operating level, and can then be output from audio outs § and/or $. To produce envelope and gate signals, the amplified...
  • Page 222 • balanced input " : 0 ... 500. within the A-100 system. 2 Overload " Symm. In LED 2 lights when the circuit is overloaded - that is, The 6.3 mm stereo full-size jack socket "...
  • Page 223 $. These two sockets are simply linked as a The A-119 is what makes it possible for individual “mini-multiple”. parts of the A-100 to manipulate external signals. In the patch in Fig. 2, an external audio signal is filtered % Env. Out by a VCF, whose cut-off frequency is controlled by an ADSR.
  • Page 224 Fig. 3: Ring modulator squelch patch In this patch, the A-119 has two functions. One is to bring the level of the signal output at § and/or $ up to the operating level of the A-100 (c. 5 V). The other is...
  • Page 225 Whenever an external audio signal is present, the VCA comes a very interesting sound, distinctive but internal A-100 sound is attenuated (set the gain of difficult to describe. Turn up the first and second VCA 2 high).
  • Page 226 A-119 System A - 100 doepfer Ext. Input / Envelope Follower...
  • Page 227 System A - 100 A-120 doepfer VCF 1 1. Introduction Module A-120 (VCF 1) is a voltage controlled low- pass filter, which filters out the higher parts of the A-120 CV 1 sound spectrum, and lets lower frequencies pass VCF 1 through.
  • Page 228 A-120 System A - 100 doepfer VCF 1 2. VCF 1 - Overview Controls: 1 Freq.: Cut-off frequency control A-120 2 CV 2: Attenuator for CV at input " VCF 1 3 CV 3: Attenuator for CV at input §...
  • Page 229 System A - 100 A-120 doepfer VCF 1 3. Controls 2 CV 2 • 3 CV 3 For voltage control or modulation of the cut-off fre- 1 Freq. quency, use these CV inputs " and/or § (see Fig. 1). Use attenuators 2 and/or 3 to adjust the control With this control you adjust the Cut-Off Frequency f voltage level.
  • Page 230 A-120 System A - 100 doepfer VCF 1 modulated by its voltage: ie., the sound color changes according to the voltage put out by the modulator. If you use the VCF as a sine wave oscillator, connect Resonance the pitch CV into this socket. Do the same if you want 0 db the filter’s cut-off frequency to track exactly with the...
  • Page 231 System A - 100 A-120 doepfer VCF 1 5. User examples Producing wind FX with A-120 and A-118 D Patch coloured noise into the audio input, and The filter’s cut-off frequency can be modulated in random voltage CV into CV2. Set the filter CV to 0,...
  • Page 232 A-120 System A - 100 doepfer VCF 1...
  • Page 233 System A - 100 A-105 / A-122 doepfer 1. Introduction The modules A-105 and A-122 are voltage- Level controlled low-pass filters, which filter out the higher A-122 Audio parts of the sound spectrum, and lets lower frequen- cies pass through.
  • Page 234 A-105 / A-122 System A - 100 doepfer 2. VCF 3 - Overview Controls: 1 Lev. : Attenuator for audio input ! A-122 VCF 3 2 Frq. : Cut-off frequency control 24 dB Low Pass II 3 FCV : Attenuator for filter CV at input §...
  • Page 235 System A - 100 A-105 / A-122 doepfer 3. Controls 1 Lev. Use this attenuator to control the amount of signal entering the filter input $. If the filter’s output sounds distorted, turn this control down, unless you deliberately want the sound as a special effect.
  • Page 236 A-105 / A-122 System A - 100 doepfer At close to maximum resonance, the filter starts to 4. In / Outputs self-oscillate, and behaves like a sine wave oscilla- tor. Thanks to this effect, you can use the filter as an ! Audio In independent tone source.
  • Page 237 System A - 100 A-105 / A-122 doepfer 5. User examples $ QCV The filter’s cut-off frequency can be modulated in This socket is the voltage control input for the filter’s various ways: resonance. • VCF - LFO Modulation of the cut-off frequency produces cycli- If you patch a modulation source (eg LFO, ADSR) to cal changes of the sound spectrum.
  • Page 238 A-105 / A-122 System A - 100 doepfer A-121 multi-mode filter’s 12 dB) with voltage control- led resonance. To create a bandpass filter, put both modules in Freq. Freq. series (see Fig. 3). The band-width is governed by the A-122...
  • Page 239 Resonance can be adjusted manually. The filter can't go into self oscillation, in contrast to most of the other VCFs in the A-100 system. The cut-off frequency can be adjusted manually, or by voltage control. Two CV inputs are available.
  • Page 240 A-124 System A - 100 doepfer Wasp Filter (VCF 5) 2. VCF 5 - Overview Controls: 1 Audio Level : Input signal attenuator A-124 VCF 5 2 Frq. : Cut-off frequency control WASP FILTER 3 CV 2 : Attenuator for filter CV §...
  • Page 241 System A - 100 Wasp Filter ( A-124 doepfer VCF 5) 3. Basics Low Pass High Pass Module A-124 contains three filter types: low-pass, high-pass and band-pass. Low-pass and high-pass signals are internally mixed and appear as the mixed LP/HP output %. The mix control 5 governs the relative amounts of low-pass and high-pass.
  • Page 242 A-124 System A - 100 doepfer Wasp Filter (VCF 5) way, you can make the frequencies around the cut-off 4. Controls point stand out more. 1 Lev. In band-pass mode, an increase in Q’s value makes This attenuator controls the input level of the signal to the bandwidth narrower.
  • Page 243 System A - 100 Wasp Filter ( A-124 doepfer VCF 5) 5 Mix 5. In / Outputs Mix control 5 adjusts the relative amounts of low-pass ! Audio In and high-pass signals appearing at the LP/HP mix output %. This socket is the filter’s audio input.
  • Page 244 A-124 System A - 100 doepfer Wasp Filter (VCF 5) 6. User examples % LP/HP Out The A-124’s cut-off frequency can be modulated in a variety of ways (see table below). This is the mixed low-pass/high-pass output. Modulator Result cyclical changes of the sound spectrum (e.g.
  • Page 245 System A - 100 A-125 doepfer VC Phaser 1. Introduction Module A-125 (VC Phaser) is a voltage controlled Level phase shifter. A-125 Audio Phase shifting can be controlled either manually or by voltage control. Shift CV 2 Other parameters which can be controlled are reso-...
  • Page 246 A-125 System A - 100 doepfer VC Phaser 2. VC Phaser - Overview Controls: 1 Level : Attenuator to control the level of the signal at input ! A-125 2 Shift : Control for manually setting the VC PHASE SHIFTER...
  • Page 247 System A - 100 A-125 doepfer VC Phaser 3. Basic principles The principle can be explained by looking at the dia- gram (Fig. 2) of a phaser created by three band pass The phasing process relies on dynamic comb filtering.
  • Page 248 A-125 System A - 100 doepfer VC Phaser 4. Controls 5 Mix 1 Level Use control 5 to determine the exact balance of phase-shifted and original signal. From minimum to Attenuator 1 controls the level of the input signal. maximum produces the following:...
  • Page 249 System A - 100 A-125 doepfer VC Phaser 5. In / Outputs 6. User examples ! Audio In Standard set-up Socket ! is the phaser’s audio input. Fig. 3 shows a typical patch, with various alternative sources of slow-changing modulators affecting the speed of the phase sweep.
  • Page 250 A-125 System A - 100 doepfer VC Phaser The phaser is simply inserted in the audio path like "Stereo"-Phasing this. For modulation sources, you could use, for Using two A-125s and the patch in Fig. 4 you can instance, any of the following:...
  • Page 251 System A - 100 A-127 doepfer Triple VC Resonance Filter 1. Introduction Module A-127 is a Voltage-Controlled Triple Reso- nance Filter), consisting of three separate band pass A-127 filters with one common input. Audio In Level VCRF Audio For each of the filters, the filter frequency and Reso- nance can be manually controlled, and in addition the filter frequency can be voltage controlled.
  • Page 252 A-127 System A - 100 doepfer Triple VC Resonance Filter 2. VCRF - Overview ➁ ➂ ➄ ➅ ➆ A-127 VCRF Triple Voltage Controlled Resonance Filter ext. CV LFO Frq. CV Ampl. VCF Frq. Resonance Audio Level Audio ➃ VCF 1...
  • Page 253 System A - 100 A-127 doepfer Triple VC Resonance Filter Controls: In- / Outputs: 1 A. In Level : Input signal attenuator ! Audio In : Input to the filter per VCF: per VCF: 2 LFO Frq. : LFO frequency control "...
  • Page 254 A-127 System A - 100 doepfer Triple VC Resonance Filter band let through, and the Audio Level control to set the 3. Basic function volume (see fig. 1). The A-127 is a triple resonant filter containing three To make it easier to understand how the A-127 is band-pass filters each with controllable filter frequency configured, fig.
  • Page 255 If the socket has nothing connected, the amplitude of The filter inputs are very sensitive, so it’s possible to the internal LFO is controlled; if the socket does have overdrive the Filter with a normal A-100 signal level something connected, the amplitude of the external (e.g. a VCO).
  • Page 256 A-127 System A - 100 doepfer Triple VC Resonance Filter If the module has been re-configured to be a low The module is set up at the factory so that attenuator 1 doesn’t have any effect on the pass filter, control 6 boosts the frequencies around...
  • Page 257 System A - 100 A-127 doepfer Triple VC Resonance Filter § Audio Out 6. User examples Each filter Audio output § sends out the signal By controlling filter frequencies with the internal LFO or processed by the particular filter. Despite what the...
  • Page 258 A-127 System A - 100 doepfer Triple VC Resonance Filter • S&H filter effects with an A-148 One of the A-127’s particular strengths is its ability to the A-148 Sample&Hold samples signals from mo- bring out the formants that are crucial in re-creating dulation sources (LFO, Noise, Random, VCO, etc.)
  • Page 259 System A - 100 A-127 doepfer Triple VC Resonance Filter o u a It’s also possible to use non-harmonic sound spectra (e.g. ring modulator signals) for further experimentation. [kHz] Another source for discovering the formant frequency range of English language vowel sounds is Allen Strange's book Electronic Music.
  • Page 260 A-127 System A - 100 doepfer Triple VC Resonance Filter A-127 ext. CV 1 Clock A-155 ADSR Trig. 1 Post Out 1 Post Out 2 fig. 5: Simulation of vowel sounds Otherwise, three vowel formant frequencies can be produced using either a MAQ 16/3 sequencer, with three control voltages per step, or by running two A-155 sequencers in parallel.
  • Page 261 System A - 100 A-127 doepfer Triple VC Resonance Filter 7. Appendix Altering the filter characteristics The characteristics of each of the indifividual filters in the A-127 can be altered by changing the position of a corresponding jumper on its three-pin connector on the filter circuit-board.
  • Page 262 A-127 System A - 100 doepfer Triple VC Resonance Filter Changing how control 1 works As standard from the factory, Attenuator 1 doesn’t have any effect on the Original control 8, so that it’s possible to adjust 1 and 8 independently.
  • Page 263 System A - 100 A-128 doepfer Fixed Filter Bank 1. Introduction Module A-128 (Fixed Filter Bank) is a filter bank, made up of 15 parallel band pass filters, all with Audio 50 Hz fixed middle frequencies and bandwidth: 50 Hz 350 Hz 2.2 kHz...
  • Page 264 A-128 System A - 100 doepfer Fixed Filter Bank 2. A-128 - Overview Controls: 1 50 ... 11000 : Amplitude controls (attenuators) for the individual band pass filters A-128 FIXED FILTER BANK Audio In In / Outputs: 2200 ! Audio In :...
  • Page 265 System A - 100 A-128 doepfer Fixed Filter Bank 3. Controls 4. In / Outputs 1 Controls 50 Hz ... 11 kHz ! Audio In With these controls you can set the amplitude of each Socket ! is the filter bank’s input, into which you of the 15 bandpass filters (see Fig.
  • Page 266 A-128 System A - 100 doepfer Fixed Filter Bank 5. User examples Emphasising certain frequencies The patch in Fig. 3 shows how to emphasise certain The main purpose of the Fixed Filter Bank is for frequencies using a filter bank.
  • Page 267 System A - 100 A-128 doepfer Fixed Filter Bank Creating a multi-band equalizer just the just the original original original filter bank + boost + cut The patch in Fig. 4 shows how to model a simple graphic equalizer. An A-138 Mixer is used to mix the In 1 0 ...
  • Page 268 A-128 System A - 100 doepfer Fixed Filter Bank 6. Patch-Sheet The following diagrams of the module can help A-128 FIXED FILTER BANK you recall your own Patches. They’re designed so that a complete 19” rack of modules will fit onto an Audio In A4 sheet of paper.
  • Page 269 System A - 100 A-129 /1/2 doepfer Modular Vocoder interface to patch in your choice of modules (eg. 1. Introduction attenuator, slew limiter, CV-to-MIDI / MIDI-to-CV inter- faces,, inverter, etc.). The A-129 /x series of modules forms a modular The Five-way VC slew limiter / offset generator / vocoder.
  • Page 270 A-129 /1/2 System A - 100 doepfer Modular Vocoder 2. A-129 /1, /2 - Overview A-129 /1 A-129 /2 VOC-A VOC-S VOCODER SYNTHESIS SECTION VOCODER ANALYSIS SECTION Speech Instrument Input Band 5 Band 10 Low Pass Band 5 Band 10...
  • Page 271 System A - 100 A-129 /1/2 doepfer Modular Vocoder In / Outputs: Filter Frequency Filter Frequency 100 Hz 1.3 kHz Low Pass Band 8 A-129 /1 Band 1 120 Hz Band 9 1.6 kHz ! Speech In : Input for the speech signal...
  • Page 272 A-129 /1/2 System A - 100 doepfer Modular Vocoder The closer the audio spectra of the speech and carrier 3. Basic principles signals are, the more speech-like the resulting recon- struction. The fundamental modules in this vocoder are the analysis section A-129 /1 and the synthesis section A-129 /2 (see Fig.
  • Page 273 That means it’s possible to modify the control Don’t forget that the speech signal needs to be at the voltages by patching any sensible choice of high level the A-100 uses internally. Plugging a module (for instance attenuators, slew li- miters, LFO, CV-MIDI / MIDI-CV interfaces, microphone directly in to the vocoder won’t work.
  • Page 274 A-129 /1/2 System A - 100 doepfer Modular Vocoder § High Pass With an A-129 /5 voiced / un-voiced detector module, you can switch the carrier signal Socket § on the analysis section is the high pass depending on whether a speech signal is filter output.
  • Page 275 Good results can also be levels and signal-to-noise - and is repeatable. obtained using computer-generated speech (as on the A-100 demo CD). • For early experiments, radio news stations provide good raw material, because they are nearly always putting out a steady stream of human speech.
  • Page 276 (see above, chapter 5, Basic Principles) into the speech input socket of the analysis section at A-129 /1 A-129 /2 normal A-100 operating level. BP 12 BP 12 D Experiment with different audio signals for the car- BP 13...
  • Page 277 System A - 100 A-129 /1/2 doepfer Modular Vocoder "Chopped up” speech Speech Instrument The patch in Fig. 4 produces chopped-up speech: the vocoder chops speech up rhythmically, in time with the BP 1 BP 1 trigger signals. The vocoder output is patched into a Voc.
  • Page 278 A-129 /1/2 System A - 100 doepfer Modular Vocoder Using with the other modules ( /3, /4, /5) Audio In While extremely usable vocoder sounds can be produ- ced with just the two basic modules, total flexibility and MIDI CV 1...
  • Page 279 System A - 100 A-129 /3/4 doepfer Modular Vocoder 1. Introduction • Manual control of the slew rate The A-129 /x series of modules is a modular voco- • CV control of the slew rate, with an input attenuator der.
  • Page 280 A-129 /3/4 System A - 100 doepfer Modular Vocoder 2. A-129 /3, /4 - Overview A-129 /4 A-129 /3 Vocoder Slew-Limiter Slew Limiter Controller Attenuator Offset Freeze CV In 1 CV Out 1 Slew Ctr. Input ➂ Freeze Follow ➁...
  • Page 281 System A - 100 A-129 /3/4 doepfer Modular Vocoder A-129 /3 A-129 /4 In- / Outputs: In- / Outputs: ! CV In 1 ... CV In 5 : $ Freeze Control Input : CV inputs Gate input for controlling the freeze function "...
  • Page 282 A-129 /3/4 System A - 100 doepfer Modular Vocoder 3. Controls and indicators • Follow : The instant you switch to this position the output signal follows the input signal. 1 Attenuator Use Attenuator 1 to lower the signal at the corre- sponding output !.
  • Page 283 System A - 100 A-129 /3/4 doepfer Modular Vocoder 5 Slew CV The amplitude of the control voltage at input % is α α α α controlled with this attenuator 5. α α α α 6 LED The LED indicates the mode of the slew limiter signal at output &:...
  • Page 284 A-129 /3/4 System A - 100 doepfer Modular Vocoder 4. In- / Outputs $ Freeze Control Input A gate signal at input $ freezes the slew limiter’s ! CV In 1 ... CV In 5 output signal (see Fig. 3).
  • Page 285 System A - 100 A-129 /3/4 doepfer Modular Vocoder % Slew CV 5. User examples Input % is where the CV should be patched in to Basic layout control the slew rate. The amplitude of the CV can be set with the attenuator 5 if required.
  • Page 286 A-129 /3/4 System A - 100 doepfer Modular Vocoder Further adventures in vocoder control Freeze Man. Contr. Slew Using the layout in Fig. 4 (and also not forgetting Input Rate the tips and suggestions for experimentation in the Follow Slew...
  • Page 287 System A - 100 A-129 /3/4 doepfer Modular Vocoder Because as a modular vocoder the A-129 is totally open-ended, it would be wrong to be Atten. prescriptive about its use. Better to appeal to In 1 Out 1 your sense of adventure and experimenta-...
  • Page 288 A-129 /3/4 System A - 100 doepfer Modular Vocoder...
  • Page 289 System A - 100 A-130 / A-131 doepfer 1. Introduction Modules A-130 (Linear VCA) and A-131 (Exp. VCA) provide voltage-controlled amplification. A-130 CV 1 This section of the manual applies equally to VCA-LIN. CV 2 the A-130 and A-131, because apart from...
  • Page 290 A-130 / A-131 System A - 100 doepfer 2. VCA - overview Controls: 1 Gain: Overall gain control 2 CV 2: CV attenuator for input " A-130 VCA-LIN. 3 IN 1: Attenuator for audio input § 4 IN 2: Attenuator for audio input $ CV 1 ➀...
  • Page 291 System A - 100 A-130 / A-131 doepfer 3. Controls 1 Gain This controls the overall gain of the VCA. At "0", with The A-130 has a linear response: the amplification is no control voltage present, there is no amplification at in direct linear proportion to the control voltage input all: no signal is present at the VCA’s output.
  • Page 292 A-130 / A-131 System A - 100 doepfer 4. In / Outputs Input Gain > 0 Output ! CV 1 • " CV 2 Gain = 0 Sockets ! and " are control voltage inputs, whose voltages are combined. The effective range of the VCA goes from 0 V (no amplification) to +5 V Fig.
  • Page 293 System A - 100 A-130 / A-131 doepfer 5. User examples tion/AM.) With an LFO frequency in the sub-audio range (1 Hz to around 15 Hz) the result is Tremolo (Fig. 5). With a modulation frequency in the audio Typical voltage controlled amplification range, sidebands occur like those produced by FM A standard VCA patch is shown in Fig.
  • Page 294 A-130 / A-131 System A - 100 doepfer The voltage control input A to the modulation depth VCA can come from an ADSR, MIDI controller, etc.. VCA 1 VCA 2 VCA 1 VCA 2 VCA 3 Gate ADSR Fig. 7:...
  • Page 295 System A - 100 A-132 doepfer Dual Low Cost VCA 1. Introduction Module A-132 (Dual Low Cost VCA) contains two A-132 voltage controlled amplifiers, with a linear response most suited to regulating the level of control voltages DUAL VCA (ADSR amount, level of vibrato effect, etc.).
  • Page 296 A-132 System A - 100 doepfer Dual Low Cost VCA 2. Dual Low Cost VCA - Overview In / Outputs: ! CV 1 : Input 1 for amplification CV A-132 " CV 2 : Input 2 for amplification CV DUAL VCA §...
  • Page 297 System A - 100 A-132 doepfer Dual Low Cost VCA 3. In / Outputs 4. User examples Control of modulation amount by AM ! CV 1 • " CV 2 In Fig. 1 an A-132 is added to the patch to make the Sockets ! and "...
  • Page 298 A-132 System A - 100 doepfer Dual Low Cost VCA MIDI-controlled VCF or VCA envelope Audio signal amplitude control amount For non-critical applications, the A-132 can also be used for amplifying audio signals. One important use of the A-132 is to control a VCF or VCA envelope according to how much velocity CV a In the example in Fig.
  • Page 299 System A - 100 A-133 doepfer Dual VC Polarizer 1. Introduction A-133 Module A-133 (Dual VC Polarizer) is a special dual voltage controlled amplifier that enables both posi- Dual VC Polarizer tive and negative amplifications. Negative amplifica- tion means in this context that the signal is inverted.
  • Page 300 A-133 System A - 100 Dual VC Polarizer doepfer 2. Overview Controls and indicators: 1 LEDs : negative/positive amplification display (not a signal display !) 2 CV : attenuator for the control voltage at input ! that controls the amplification ➀...
  • Page 301 This control is used to adjust the amplification manu- resistor has to be replaced. Please look at ally. The range is about -2.5 to +2.5 (without external the A-100 service manual or contact hard- control voltage). The middle position corresponds to ware@doepfer.de. We think that -2.5...+2.5...
  • Page 302 System A - 100 Dual VC Polarizer doepfer CV In ons would cause clipping for all standard A-100 signals (like LFOs, ADSRs or VCOs). A-133 If the amplification is negative the signal is inverted (see table above). Fig. 1: Generating new waveforms The effects of the manual control 3 and the external Same applies for modulations (see fig.
  • Page 303 System A - 100 A-134 doepfer Voltage Controlled Panning 1. Introduction Module A-134 (PAN) is designed to provide voltage- controlled panning for audio signals. A-134 It can equally well pan between inputs (with two in- VC Panning Module puts going to one output) and between outputs - one input going to two outputs.
  • Page 304 A-134 System A - 100 doepfer Voltage Controlled Panning 2. PAN - Overview Controls and indicators: A-134 1 LEDs : status indicators for audio output VC Panning Module 2 Pan : manual panning control ➀ 3 CV 2 : attenuator for the CV at input "...
  • Page 305 System A - 100 A-134 doepfer Voltage Controlled Panning 3. Basic layout In output panning mode, the signal present at audio input 1 (§) is sent to the left (%) and right (/) audio outputs at levels determined by the pan control 2 and/ The A-134 provides both manual and voltage- or the control voltage/s input to the module.
  • Page 306 A-134 System A - 100 doepfer Voltage Controlled Panning 2 Pan LEDs Mix Output Just the signal from Audio In 1 Control 2 is used to control the relative signal levels at outputs %, & and /. In input mixing mode, you...
  • Page 307 System A - 100 A-134 doepfer Voltage Controlled Panning 5. In- / Outputs 6. User examples There are a whole load of possibilities for using Mo- ! CV 1 • " CV 2 dule A-134, principally because any signal you think of Inputs ! and/or "...
  • Page 308 A-134 System A - 100 doepfer Voltage Controlled Panning • Sequencer Panning controlled by voltages put out by a se- Gate quencer such as the A-155. In the patch in fig. 5, the control voltages are produced by the lower row of the A-155, so that as the sequence runs, each note is positioned at a different place in the stereo soundstage.
  • Page 309 System A - 100 A-134 doepfer Voltage Controlled Panning Audio In 1 Left Audio Audio- In 1 VCFS Signal Audio Audio Right CV In In 2 CV In CV In Random Colored A-118 A-148 A-178 Trig. In Audio Gate In 1...
  • Page 310 A-134 System A - 100 doepfer Voltage Controlled Panning Clock A-155 Trig. 1 Glide Crtl. 1 Left Audio Gate In 1 Pre Out 1 Post Out 2 Right CV In ADSR Fig. 5: Output panning using a sequencer.
  • Page 311 System A - 100 A-135 doepfer VC-Mixer 1. Introduction Module A-135 (VC-Mixer) is a four-channel voltage controlled mixer, which is used to mix audio signals CV 1 ext. CV A-135 with four independent voltage controlled levels. VC-Mixer The module consists of 4 linear voltage controlled Gain 1 amplifiers (VCAs) mixed to one common output.
  • Page 312 A-135 System A - 100 doepfer VC-Mixer 2. VC-Mix - Overview Controls: 1 Audio In : Attenuator for audio si- gnal at input ! A-135 VCMIX 2 Gain : Control for amplification VOLTAGE CONTROLLED MIXER offset Audio In Gain ext. CV 3 ext.
  • Page 313 System A - 100 A-135 doepfer VC-Mixer 3. Controls The VCA’s used in the A-135 (CEM3381) have a linear control response. The amplification is in direct linear proportion to the control voltage input. 1 Audio In The four attenuators 1 control the levels of the audio inputs.
  • Page 314 A-135 System A - 100 doepfer VC-Mixer 4. In / Outputs Ou tput ( Gain = 0 ) ! Audio In Ou tput ( Gain > 0 ) Inpu t The signals you wish to amplify are input through the four audio inputs !.
  • Page 315 System A - 100 A-135 doepfer VC-Mixer 5. User examples • Pitch CV • After touch Module A-135 enables voltage controlled mixing of up to 4 audio sources with 4 different control volta- • Pitch bend ges. • Modulation The control voltages can be generated by any voltage •...
  • Page 316 A-135 System A - 100 doepfer VC-Mixer 6. Patch-Sheet The following diagrams of the module can help you A-135 VCMIX recall your own Patches. They’re designed so that a VOLTAGE CONTROLLED MIXER complete 19” rack of modules will fit onto an A4 sheet...
  • Page 317 System A - 100 A-136 doepfer Distortion / Waveshaper 1. Introduction Module A-136 is a distortion and waveshaping mo- dule with extensive control possibilities. Different set- tings of 5 distortion/waveshaping parameters enable a A-136 lot of very complex and extreme waveform modificati- ons.
  • Page 318 A-136 System A - 100 doepfer Distortion / Waveshaper 2. DIS - Overview Controls: 1 A : Amplification control for original signal 2 + L : Clipping control for positive signal compo- A-136 nent Distortion / Waveshaper 3 - L :...
  • Page 319 System A - 100 A-136 doepfer Distortion / Waveshaper 3. Controls 2 + L • 3 - L Controls 2 and 3 adjust the positive (+L) and negative (-L) clipping levels respectively. Control 1 defines the amplification A of the original In the positive signal section only signal voltages signal.
  • Page 320 A-136 System A - 100 doepfer Distortion / Waveshaper When an external control voltage is patched 4. In / Outputs to the normalled socket " (or § respectively) control +L (or -L respectively) has no ! Input function. In this case the clipping level is determined only by the external control Socket ! is the signal input of the A-136.
  • Page 321 System A - 100 A-136 doepfer Distortion / Waveshaper 5. User Examples Typical applications of module A-136 are: • Audio distortion (especially interesting Different settings of the 5 parameters enable a lot of combination with filters), whereby the features of...
  • Page 322 A-136 System A - 100 doepfer Distortion / Waveshaper 6. Patch-Sheet The following diagrams of the module can help you recall your own Patches. They’re designed so A-136 A-136 A-136 that a complete 19” rack of modules will fit onto an...
  • Page 323 System A - 100 A-137 doepfer Waveform Multiplier 1. Introduction Module A-137 is a Voltage Controlled Waveform Mul- tiplier. The basic idea of a wave multiplier is to multiply the waveform of an incoming signal (e.g. triangle from a VCO) within one period. This leads to additional harmonics.
  • Page 324 A-137 System A - 100 Waveform Multiplier doepfer 2. Basic principles The signal is processed by a standard linear VCA and 4 so-called wave folding stages. The amplification of the VCA is identical with the Multiples parameter. This is the working principle of the folding stages: As soon as the signal goes beyond the upper resp.
  • Page 325 System A - 100 A-137 doepfer Waveform Multiplier As the amplification resp. the Multiples parameter in- Fig 3 shows the complete schematics of the A-137 creases even the peaks of the folded signal reach the module. For each of the four parameters Multiples,...
  • Page 326 A-137 System A - 100 Waveform Multiplier doepfer Controls: 3. Overview 1a CV Multiples: Attenuator for CV input ! 1b Man. Multiples: Manual Multiples control 2a CV Folding Level: Attenuator for CV input " 2b Man. Folding Level: Manual Folding Level control 3a CV Symmetry: Attenuator for CV input §...
  • Page 327 System A - 100 A-137 doepfer Waveform Multiplier The following is valid for each of the 4 parameter groups: 4. Controls Each parameter has available a manual control knob (1b/2b/3b/4b) and an external control voltage input 1a CVM (knob) / ! CVM (socket) (!/"/§/$).
  • Page 328 System A - 100 Waveform Multiplier doepfer 5. User Examples & Out (socket) not yet ready This is the audio output of the module. The output signal can be processed by other A-100 modules like filters, VCAs, phaser, reverb or a second A-137.
  • Page 329 System A - 100 A-138 doepfer MIXER 1. Introduction Module A-138 (MIXER) is a four channel mixer, which can be used with either control voltages or audio si- A-138 gnals. MIXER In 1 Each of the four inputs has an attenuator, and there’s a...
  • Page 330 A-138 System A - 100 doepfer MIXER 2. MIXER - Overview Controls and markings: 1 lin. / exp.: indication of type of mixer: A-138 a: linear potentiometers A-138 b: logarithmic potentiometers A-138 MIXER 2 In 1: Attenuator for input ! ➀...
  • Page 331 % OUT The output level of the mixer is controlled by attenua- tor 5. Unlike on most A-100 modules, the output has an The mixed signal is available at the output. attenuator, so that it can act as the end of the audio chain, and interface directly with a mixing desk, ampli- fier, etc.
  • Page 332 A-138 System A - 100 doepfer MIXER 5. User examples Mixing control voltages You may sometimes need more CV inputs than a parti- Mixing audio signals cular module has - for instance if you want to control VCF 1 with an ADSR, LFO, aftertouch, and keyboard D Use A-138 b, and patch the audio signals to be tracking.
  • Page 333 System A - 100 A-138c doepfer Polarizing Mixer 1. Introduction Module A-138c is a four channel mixer, that allows to add or subtract four incoming voltages to the output signal. In the middle position of the corresponding control knob the amplification is zero, i.e. the signal will be suppressed.
  • Page 334 A-138c System A - 100 Polarizing Mixer doepfer 2. Overview Controls: 1...4 In1 ... In4 polarizing control input 1 ...4 5 Out polarizing control output Inputs / Outputs: " !...$ Input 1 ...4 input 1 ...4 % Output output §...
  • Page 335 System A - 100 A-138c doepfer Polarizing Mixer 3. Controls / Inputs / Outputs 1...4 In1 ... In4 (controls) !...$ Input 1 ... Input 4 (sockets) These are the four inputs !...$ of the module with the corresponding polarizing controls 1...4. In contrast to a normal attenuator (e.g.
  • Page 336 "module modifications" on DIY page of our web This is the pin-out of the pin header: site www.doepfer.com). Control In1 works as a DC offset generator (about Switch Contact In 1 -5V...+5V) provided that no patch cord is plugged into...
  • Page 337 System A - 100 A-140 doepfer ADSR 1. Introduction Module A-140 (ADSR) is an envelope generator, and, since it puts out control voltages, counts as one A-140 Gate of the modulation devices in a modular system. ADSR As soon as the gate input receives sufficient voltage,...
  • Page 338 A-140 System A - 100 doepfer ADSR 2. ADSR overview Controls: 1 A: Attack time control A-140 ADSR 2 D: Decay time control ENVELOPE GEN. 3 S: Sustain level control Gate 4 R: Release time control – ➀ 5 ADSR Control:LED envelope state indicator 6 Time Range:Three-position range switch Retrig.
  • Page 339 System A - 100 A-140 doepfer ADSR 3. Controls With this control you set the envelope’s attack time. The ADSR puts out a varying voltage, called an enve- Whenever the envelope is triggered - via the internal lope, whenever a gate signal is sensed (see Fig. 1).
  • Page 340 If you want, you can undo the normalling to the system bus more permanently, by turning the A-100 off, remo- ving the A-140 module, and taking out the little red jumper in the top right-hand corner of the circuit...
  • Page 341 System A - 100 A-140 doepfer ADSR " Retrig. % Inverse Output Socket " is the ADSR’s retrigger input, which can be The Inverse Output carries exactly the same voltage connected, for instance, to the output from an LFO. envelope as the ordinary outputs but inverted - with negative instead of positive voltages (see Fig.
  • Page 342 A-140 System A - 100 doepfer ADSR • ADSR - VCLFO 5. User examples Control of the frequency of an A-147 VCLFO pro- duces variation in LFO frequency as a note pro- The envelope generated by the ADSR can be used for gresses.
  • Page 343 System A - 100 A-141 doepfer VCADSR 1. Introduction Module A-141 (VCADSR) is a voltage controlled A-141 envelope generator. Gate VCADSR Whenever a gate signal is sensed at the VCADSR’s gate input, an adjustable sequence of voltages is Retrig. triggered - the envelope. You can then use these...
  • Page 344 A-141 System A - 100 doepfer VCADSR 2. VCADSR - Overview Controls and indicators: 1 A : Attack time control A-141 VCADSR 2 D : Decay time control Voltage Controll. Envelope Generator 3 S : Sustain level control CV A...
  • Page 345 System A - 100 A-141 doepfer VCADSR 3. Controls and indicators This controls the Attack time of the envelope. As soon as a gate signal is sensed at the VCADSR Whenever the VCADSR is triggered - by a key being...
  • Page 346 A-141 System A - 100 doepfer VCADSR 5 CV A 8 CV R Output Attenuators 5 to 8 set the level of voltage control for inputs ! to $. Gate 9 LED The LED indicates the level of the envelope’s voltage.
  • Page 347 System A - 100 A-141 doepfer VCADSR 5. User examples a MIDI sequencer and MIDI-CV interface (for in- stance, the A-191) by simply sending MIDI controller messages. Basically, the envelope generated by the VCADSR can be used for any number of types of modulation: That actually makes the ADSR parameters program- •...
  • Page 348 A-141 System A - 100 doepfer VCADSR output from an A-118 module, or cyclically, by using an LFO such as the A-145, A-146 or A-147. This is where creativity and love of experimentation get to be really important - but one suggestion at least Gate is that the Decay parameter is a good one to start with.
  • Page 349 System A - 100 A-142 doepfer Voltage Contr. Decay / Gate 1. Introduction Module A-142 (VCD) is a dedicated envelope gene- rator with just one parameter, decay time. This decay time is either controlled manually or by voltage con- A-142 trol.
  • Page 350 A-142 System A - 100 doepfer Voltage Contr. Decay / Gate 2. Overview Indicators and controls: 1 Decay : Manual control for altering the decay time. A-142 2 CV : Attenuator for control voltages at CV Volt. Contr. Decay / Gate input "...
  • Page 351 System A - 100 A-142 doepfer Voltage Contr. Decay / Gate Trig In 3. Controls and indicators 1 Decay This is used for manual control of the decay time t Env Out the envelope generated. After an extremely short at- tack phase, the envelope runs from maximum to zero in the time that has been set by this control (see fig.
  • Page 352 A-142 System A - 100 doepfer Voltage Contr. Decay / Gate 4. In- / Outputs 5. User Examples Since the A-142 is really a simple envelope, with just ! Trig. In the one parameter to control, ideas for its use can include any of the occasions on which you might use Socket ! is where the trigger signal is patched in.
  • Page 353 System A - 100 A-142 doepfer Voltage Contr. Decay / Gate random length. An interesting variation on this theme Clock is to patch the output into a filter CV input, so that each new note has a different filter accent.
  • Page 354 A-142 System A - 100 doepfer Voltage Contr. Decay / Gate Trigger Trig In VCD 1 Env Out VCD 1 Inv. Gate Out VCD 1 Trig. In Threshold VCD 1 Inv. Gate Out VCD 1 Gate Out VCD 2 Trig. In...
  • Page 355 System A-100 Quad AD/LFO A-143-1 DOEPFER DOEPFER DOEPFER DOEPFER 1. Introduction Module A-143-1 contains four independent Attack/Decay generators. When the module is used as a complex envelope generator, then two, three or four units are daisy- chained, i.e. the preceding unit triggers the following unit.
  • Page 356 Otherwise it’s high. Both digital outputs EOA and Cp Out can be used to trigger other A-100 modules or other units of the A-143-1. The retrigger behaviour of the A-143-1 is different compared to other envelope generators. During the rising slope of the envelope (attack phase) the envelope cannot be retriggered or reset.
  • Page 357 System A-100 Quad AD/LFO A-143-1 DOEPFER DOEPFER DOEPFER DOEPFER Provided that the trigger inputs are not patched the four units are daisy chained via the comparator outputs (Cp Out) as they are normalled via the switching contacts of the trigger input sockets, i.e. each unit is triggered by the Cp output of the preceding unit.
  • Page 358 Quad AD/LFO A-143-1 System A-100 DOEPFER DOEPFER DOEPFER DOEPFER 3. Overview " § Fig. 5: A-143-1 front panel...
  • Page 359 System A-100 Quad AD/LFO A-143-1 DOEPFER DOEPFER DOEPFER DOEPFER Controls: Inputs and Outputs: AD/LFO : mode switch Trig. In : trigger input normalled to Cp 4 for unit 1 normalled to Cp 1 for unit 2 Attack: attack control (rising slope)
  • Page 360 Quad AD/LFO A-143-1 System A-100 DOEPFER DOEPFER DOEPFER DOEPFER 3. Controls, Inputs and Outputs AD/LFO : mode switch This switch defines the function of the corresponding unit. In Trig. In : trigger input the upper position (AD) the envelope mode is selected, in the lower position (LFO) the free-running mode.
  • Page 361 It output %. This control is a so-called polarizer. The neutral can be used to trigger other A-100 modules or other units of position of the polarizer knob is at its center (0). Left from the A-143-1.
  • Page 362 Quad AD/LFO A-143-1 System A-100 DOEPFER DOEPFER DOEPFER DOEPFER 4. User Examples A special application of the quad AD generator is the The A-143-1 is suitable for all kinds of modulations where subsequent control of up to four similar modules (e.g. VCAs, normally LFOs or envelope generators are used.
  • Page 363 System A-100 Quad ADSR A-143-2 DOEPFER DOEPFER DOEPFER DOEPFER 1. Introduction Module A-143-2 contains four independent ADSR-type envelope generators. Each sub-unit has available the controls Attack, Decay, Sustain and Release. The three- position Range switch allows selection of the desired time range (low - high - medium).
  • Page 364 Quad ADSR A-143-2 System A-100 DOEPFER DOEPFER DOEPFER DOEPFER 2. Basic Principles the Sustain level defined by the sustain control with a time adjusted by the decay control. At the end of the decay phase the envelope output remains at the sustain level until Fig.
  • Page 365 System A-100 Quad ADSR A-143-2 DOEPFER DOEPFER DOEPFER DOEPFER 3. Overview § " & Fig. 5: A-143-2 front panel...
  • Page 366 Quad ADSR A-143-2 System A-100 DOEPFER DOEPFER DOEPFER DOEPFER Controls: Inputs and Outputs: Range : range switch low – high – medium gate input (gate inputs 2…4 are normalled to gate input 1) Attack : attack control " End of A :...
  • Page 367 2. The output levels are about +10V. Range : range switch low – high – medium Attack : attack control These outputs can be used to trigger other A-100 modules Decay : decay control (or another unit of the A-143-2) synchronized to the ADSR Sustain : sustain control envelope generated by the A-143-2.
  • Page 368 Quad ADSR A-143-2 System A-100 DOEPFER DOEPFER DOEPFER DOEPFER 4. User Examples The A-143-2 is suitable for all kinds of modulations where envelope generators are used. Please refer to the manuals of other envelope generators (e.g. A-140, A-141, A-142). Cyclically triggered envelope generators The EOD output of each unit is patched to the gate input of the succeeding unit.
  • Page 369 System A-100 Quad LFO A-143-3 DOEPFER DOEPFER DOEPFER DOEPFER 1. Introduction Module A-143-3 Quad LFO is a low-cost four-fold modulation oscillator and includes four independent low frequency oscillators (LFO's), which produce cyclical control voltages in a wide frequency range. Three waveforms are available for each LFO: triangle, square and sawtooth.
  • Page 370 Quad LFO A-143-3 System A-100 DOEPFER DOEPFER DOEPFER DOEPFER 2. Overview Controls: Frequ. : frequency control Range: frequency range switch LED control § Outputs: " triangle output " rectangle output § sawtooth output The controls and outputs are the same for all four sub-units.
  • Page 371 System A-100 Quad LFO A-143-3 DOEPFER DOEPFER DOEPFER DOEPFER 3. Controls and Outputs This is the output for the triangle wave, whose frequency is displayed by LED 3. The output is symmetrical around 0V, 1 Frequency the level is about ± 7 V.
  • Page 372 Quad LFO A-143-3 System A-100 DOEPFER DOEPFER DOEPFER DOEPFER 4. User Examples In principle any control voltage input can be controlled by an An LFO can be used for all sorts of different modulations: LFO to modulate the parameter in question.
  • Page 373 System A - 100 A-144 doepfer Morphing Controller 1. Introduction Module A-144 is an extension module for the Voltage A-144 Controlled Mixer A-135. It is a so-called Morphing Controller that derives from a linear increasing con- trol voltage at the input (0...+5V) four displaced triangle voltages (0 bis +5 V).
  • Page 374 A-144 System A - 100 doepfer Morphing Controller 2. Overview Controls: 1 CV : Attenuator for the control voltage at A-144 MC input ! 2 Man. Morph : Manual morphing control Morph Controller CV In ➀ – In- / Outputs:...
  • Page 375 System A - 100 A-144 doepfer Morphing Controller 3. Controls E.g. the control voltage “a” has the following effect: Out 1 = max. (i.e. +5V) • Out 2 = 0 • Out 3 = 0 • Out 1 CV 4 = 0.
  • Page 376 A-144 System A - 100 doepfer Morphing Controller 4. In- / Outputs A-144 A-135 ! CV In VC-Mixer The external control voltage is fed into the CV input CV Out Audio In ext. CV 1 ext. ext. CV 2 " Out 1 •...
  • Page 377 System A - 100 A-144 doepfer Morphing Controller Different control voltage sources lead to interesting CV In Audio In morphing effects: Automatic morphing ca be realized e.g. with LFO (A-145, A-146), VCLFO (A-147), ADSR (A-140), A-144 VCA 1 VCADSR (A-141) or analog sequencer (A-155).
  • Page 378 A-144 System A - 100 doepfer Morphing Controller 6. Patch-Sheet The following diagrams of the module can help you A-144 MC A-144 MC A-144 MC recall your own Patches. They’re designed so that a Morph Controller Morph Controller Morph Controller complete 19”...
  • Page 379 System A - 100 A-145 doepfer 1. Introduction Module A-145 (LFO) is a low frequency oscillator, which produces cyclical control voltages in a very wide A-145 range of frequencies. Five waveforms are available: sawtooth, inverted sawtooth, triangle, sine and square wave.
  • Page 380 A-145 System A - 100 doepfer 2. Overview Controls and indicators 1 LED: frequency indicator for the sawtooth wave at output " A-145 2 LED: frequency indicator for the sine and square waves at output § and/or $ – 3 Frequ.:...
  • Page 381 System A - 100 A-145 doepfer 3. Controls and indicators 4. In / Outputs 1 LED ... 2 LED LEDs 1 and 2 show the frequency of the voltage This is the output for the inverted sawtooth. output at sockets " to $.
  • Page 382 A-145 System A - 100 doepfer & Reset In Trigger Trigger LFO synchronisation is possible, by sending a trigger Moment Moment signal (eg. a gate) to the reset input. Every time a trigger voltage is sensed (for instance when a key is pressed), the LFO’s waveform resets, and starts from...
  • Page 383 System A - 100 A-145 doepfer 5. User examples Producing echo effects As well as modulation effects, LFOs can also create An LFO can be used for all sorts of different modulati- time-based repeat effects. In Fig. 3 the LFO is being ons: used to produce an echo effect.
  • Page 384 A-145 System A - 100 doepfer 6. Patch-Sheet The following diagrams of the module can help A-145 A-145 A-145 you recall your own Patches. They’re designed so that a complete 19” rack of modules will fit onto an A4 sheet of paper.
  • Page 385 System A - 100 A-146 doepfer LFO 2 1. Introduction Module A-146 (LFO 2) is a Low Frequency Oscilla- tor, which produces periodic control voltages over a wide range of frequencies. LFO 2 The LFO can be used as a modulation source for a series of modules (for instance pulse width and/or Frequ.
  • Page 386 A-146 System A - 100 doepfer LFO 2 2. Overview Controls and indicators: 1 Frequ. : frequency control LFO 2 2 Frequ. Range : switch for selecting frequency range Variable Waveform LFO 3 Waveform : control for adjusting the waveform or pulse width ➀...
  • Page 387 System A - 100 A-146 doepfer LFO 2 3. Controls and indicators If the LFO frequency goes above about 15 to 20 Hz, our persistence of vision means that 1 Frequ. the LEDs look permanently on. Use this control to set the LFO’s frequency, within the range set by 4.
  • Page 388 A-146 System A - 100 doepfer LFO 2 5. User examples A-146 special features and their uses Compared with the A-145 "standard LFO", the A-146 The LFO can be used for all sorts of modulation: has the following particular features and uses: •...
  • Page 389 System A - 100 A-146 doepfer LFO 2 • Variable pulse width A-145 A-162 ADSR In using the square wave for AM or FM in the audio range, it’s possible to control the timbre by adju- sting the pulse width, because the amount of over- tones (and sidebands) present is directly related to the width of the pulse.
  • Page 390 A-146 System A - 100 doepfer LFO 2 With the normal positive/negative square wave mo- dulating the pitch, the result is notes that are annoyin- gly out of tune with the keyboard (see Fig. 4, top right of diagram). If instead you use the positive square wave, the...
  • Page 391 System A - 100 A-147 doepfer VCLFO 1. Introduction Module A-147 (VCLFO) is a voltage controlled low frequency oscillator, which can produce cyclical con- A-147 Reset trol voltages over a 0.01Hz to 50Hz frequency range. VCLFO The VCLFO can be patched as a modulation source Frequ.
  • Page 392 A-147 System A - 100 doepfer VCLFO 2. Overview Controls and indicators: 1 Frequ. : Manual frequency control A-147 VCLFO 2 CV : Attenuator for the voltage at input " Voltage Controlled LFO 3 LED : Frequency indicator for the triangle Frequ.
  • Page 393 System A - 100 A-147 doepfer VCLFO 3. Controls and indicators 4. In- / Outputs 1 Frequ. ! Reset This control sets the frequency of the VCLFO in a A gate pulse entering the reset input socket ! enab- range from 0.01 Hz (one cycle every 100 seconds) to les the VCLFO to be synchronised with another 50 Hz (50 cycles a second).
  • Page 394 A-147 System A - 100 doepfer VCLFO ~ +5 V This socket outputs a sine wave (amplitude range ˜ roughly ± 5 V), whose frequency / voltage state is indicated by LED 3 . ~ -5 V ~ +5 V ™...
  • Page 395 System A - 100 A-147 doepfer VCLFO 5. User examples Simulating string vibrato The patch in Fig. 2 shows a string vibrato simula- An LFO can be used for all sorts of different modulati- tion, copying the common guitar or violin playing...
  • Page 396 A-147 System A - 100 doepfer VCLFO VCA 2 Gate ADSR 1 A-147 Reset ADSR 2 Fig. 2: Simulation of string vibrato Integrating the VCLFO into a MIDI system That makes the LFO frequency in effect program- mable, and also naturally means that you can control it Unlike the A-145 and A-146 LFOs, the A-147’s fre-...
  • Page 397 System A - 100 A-148 doepfer Dual S&H 1. Introduction Module A-148 (Dual S&H) has two identical sample & hold modules, designed to produce ‘staircase’ volta- ges. A-148 DUAL S&H The signal present at the sample input (voltage range -8V...+8V) is sampled at a rate set by the signal at the Trig.
  • Page 398 A-148 System A - 100 doepfer Dual S&H 2. Overview Indicators: 1 LEDs: sampled voltage status indicators A-148 DUAL S&H In / Outputs: Trig. – ! Trig In : Input for trigger signal Smp. — " Smp In : Input for signal to be sampled §...
  • Page 399 S&H function will not work any longer. But the module cannot be destroyed as long as the voltage is in the range -12V...+12V. And that is the maximum voltage output from any A-100 module. Consequently within the A-100 no damage is possible.
  • Page 400 A-148 System A - 100 doepfer Dual S&H 5. User examples You can use the same basic set-up as in Fig. 2, but patch the S & H voltage output to the CV input of a filter set to high resonance, for...
  • Page 401 System A - 100 A-148 doepfer Dual S&H A-170 S&H Abb. 3: Glissando If you like you can patch the gate signal to the reset input of the LFO, so that its wa- veform starts at the beginning for each note.
  • Page 402 A-148 System A - 100 doepfer Dual S&H Random filter settings per note With the patch in Fig. 4, every time a keyboard gate voltage is received, a new random filter CV is sent out. For best results, adjust the resonance to a high setting.
  • Page 403 System A - 100 A-149 /1 doepfer 1. Introduction Module A-149-1 is a Random Control Voltage A-149 Source based on the idea of Don Buchla's "Source of Uncertainty 265/266" modules. It has available 4 ana- log random voltages, that are generated in different...
  • Page 404 A-149 /1 System A - 100 doepfer 2. Overview Controls and Indicators 1 Man N : manual control of “N” 2 CV N : attenuator for CVN at input ! 3, 4 LED : display for output § resp. $ ➁...
  • Page 405 System A - 100 A-149 /1 doepfer 3. Controls 2 CVN The external control voltage CVN fed into input ! is 3.1 Quantized Random Voltages attenuated with this control. 1 Man N 3 LED • 4 LED This is the manual control for the integer number N in The brightness of each LED is proportional to the the range 1 to 6.
  • Page 406 A-149 /1 System A - 100 doepfer 4. In- / Outputs D ~ 0 D ~ 0 D = 5 D = 5 D ~ 10 D ~ 10 4.1 Quantized Random Voltages ! CV N In This socket is the Control Voltage input for the para- meter "N".
  • Page 407 4.2 Stored Random Voltages 5. User examples % CV D In The Doepfer web site www.doepfer.com shows some This socket is the Control Voltage input for the typical examples of the A-149-1, including sound examples in the mp3 format. Even more details con- probability distribution "D".
  • Page 408 A-149 /1 System A - 100 doepfer tempo of the VCLFO A-147. Thus as the range of pitch More examples with random voltage sources can be selection increases the number of possible spectral found in Allen Strange's book from page 80 (e.g. the ranges becomes exponentially (or geometrically) grea- "Dream machine"...
  • Page 409 Clock Input of the "Quantized Random Volta- ges" section of the A-149-1 the A-149-2 can be used to create random rhythmical sequences. Module A-149-2 requires module A-149-1 and has to be assembled next to the A-149-1 into the A-100 frame.
  • Page 410 A-149-2 System A - 100 Digital Random doepfer 2. Overview Controls: 1... 8 (LEDs): Display for each output Outputs: " ! ... ( (sockets): Digital outputs § &...
  • Page 411 Details about this subject are available in the A-149-1 manual and on our web site www.doepfer.com where the method of random voltages generation with the A-149-1 is described in detail. As the level changes are triggered by the QRV clock the A-149-2 outputs have a timing correlation with the clock signal and can be used e.g.
  • Page 412 16 pin female connector has to be cable has to be the same polarity (i.e. red wire to bottom connected to a free pin header of the A-100 bus board. for both modules). Pay attention to the right polarity (red wire = bottom).
  • Page 413 / input). From about March 2004 a new version of the A-150 is I/O 1 available. This allows the full A-100 voltage range -12V...+12V for the voltages at the O/I resp. I/O soc- I/O 2 kets.
  • Page 414 A-150 System A - 100 doepfer Dual VCS 2. Overview Indicators: 1 LED: indicator for in / output " A-150 2 LED: indicator for in / output § DUAL VCS – In / Outputs: ➀ — ! CV input for digital control voltage I/O 1 "...
  • Page 415 System A - 100 A-150 doepfer Dual VCS 3. Indicators 1 LED ... 2 LED LEDs 1 and 2 serve as status indicators, to show ~ 3.6 V which of the two in / outputs " and § is at that moment connected to the common out / input $.
  • Page 416 -12V...+12V for the voltages at A-121 the O/I resp. I/O sockets. The new version can be identified at the pc board label "A-100 SY- STEM A-150 DUAL VC SWITCH VERSION 2 " near the bus connector at the pc board edge.
  • Page 417 System A - 100 A-150 doepfer Dual VCS Switching between modulation sources Switching by audio-range signals In the example in Fig. 3, the A-150 switches between In Fig. 4, the A-150 is set up to switch the audio output two filter cut-off modulation sources.
  • Page 418 A-150 System A - 100 doepfer Dual VCS...
  • Page 419 2, 3 or 4. On top of that the new versions allows to switch audio or control signals within the full A-100 voltage range (i.e. -12V...+12V).
  • Page 420 A-151 System A - 100 doepfer Quad Sequential Switch 2. Overview Indicators: 1 LED: Indicator for in / output $ 2 LED: Indicator for in / output % 3 LED: Indicator for in / output & 4 LED: Indicator for in / output /...
  • Page 421 Socket $ is the common out /input. Each time the pulse (at the rising edge), the common out / input is A-100 is switched on, or a reset pulse is received, this switched to the next in / output. socket is connected to the first in / output socket $ (see Fig.
  • Page 422 From version 2 of the module (from about 2005) the full voltage range of the A-100 (i.e. -12V...+12V) can be switched without any modification. Version 2 can be identified with the additional switch 5 Steps.
  • Page 423 System A - 100 A-151 doepfer Quad Sequential Switch 5. User examples As an alternative to using an LFO or VCO to trigger the waveform sequencing, it’s possi- Switching VCO waveforms ble to get the VCO to trigger the switching In the example in Fig.
  • Page 424 A-151 System A - 100 doepfer Quad Sequential Switch Switching filter characteristics With the patch in Fig. 4, you can use an A-151 to step through each of the types of output in the A-121 multimode filter, one step for each note played.
  • Page 425 The module can be used for a lot of switching and controlling functions in the A-100 system. Among other things the T&H section of the A-152 allows the emulation of the "toggling T&H" function of the Buchla module...
  • Page 426 System A - 100 doepfer Voltage Addressed T&H/Switch A-152 2. Basic principles Sub-device #2 is the addressed 8-fold T&H. The signal at the common T&H input is connected to the addressed The sum of the voltages coming from the manual T&H output.
  • Page 427 System A - 100 doepfer Voltage Addressed T&H/Switch A-152 Controls: 3. Overview " § 1 Address manual address control 2 CV attenuator for address CV input $ 3 1...8 LED display (8x) Inputs / Outputs: !a SW I/O single multiplexer inputs/outputs (8x)
  • Page 428 System A - 100 doepfer Voltage Addressed T&H/Switch A-152 Attention! If the module is be controlled by clock and 3. Controls / Inputs / Outputs reset signals the analog control voltage has to remain unchanged as the CV control has priority over the 1 Address (control) clock/reset control.
  • Page 429 The voltage range of the The digital outputs can be used to reduce the number of in/outputs to be switched is the full A-100 voltage addressed stages in the clocked mode. If the digital range -12V..+12V. All A-100 signals can be switched output 5 is connected to the reset input &...
  • Page 430 System A - 100 doepfer Voltage Addressed T&H/Switch A-152 Normalling options • JP8 top, JP7 away from the common T&H The common terminals of the multiplexer and the T&H (factory setting ) section can be normalled in different ways, i.e. they can be pre-connected provided that no plugs are inserted into the corresponding sockets.
  • Page 431 Normally the levels are adjusted with faders and the fader positi- ons represent the waveform. In the A-100 such a VCO is not available as we believe that the expenditure and costs do not correspond to the result. From our point of view the features of a graphic VCO are overestimated very often.
  • Page 432 System A - 100 doepfer Voltage Addressed T&H/Switch A-152 For the last 3 examples the waveform changes more or Mono-Poly-Konverter less accidentally. If the A-149-1 resp. A-149-2 is used The picture below shows an application of the A-152 that the waveform changes can be synced as for these distributes a monophonic pitch control voltage (e.g.
  • Page 433 S&H. For details please refer to the the width is too short the A-152 may not trigger or the DIY page on our web site www.doepfer.com. step advances are uneven. After that the delay time is adjusted so that the CV values appear sequentially at the T&H outputs of the A-152 as expected.
  • Page 434 In principle the gate outputs can be used for any gate/ The multiplexer unit can be used for additional switching trigger/clock function in the A-100. functions (e.g. to connect different modulation or audio sources to a module).
  • Page 435 System A - 100 A-154 doepfer Sequencer Controller 1. Introduction • Internal voltage controlled clock generator with manual and voltage controlled (with attenuator) Module A-154 is a supplement to the Analog/Trigger clock rate, enables variable time length for each Sequencer A-155. It offers a lot of new features that are step, e.g.
  • Page 436 A-154 System A - 100 Sequencer Controller doepfer Fig.1: Overall view...
  • Page 437 The combina- tion of A-154 and A-155 does not work before this high / 1 high / 1 high / 1 procedure is carried out. It is not sufficient simply to assemble the A-154 into the A-100 frame !
  • Page 438 A-154 System A - 100 Sequencer Controller doepfer 3. Overview & " & § & &...
  • Page 439 System A - 100 A-154 doepfer Sequencer Controller Controls: Inputs / Outputs: 1a Manual Mode: Manual Mode control ! Mode CV: Mode control voltage input 1b Mode CV: Attenuator for CV input ! " First CV: First control voltage input Mode display (6 LEDs) §...
  • Page 440 A-154 System A - 100 Sequencer Controller doepfer 4. Controls Which of the steps is the final step depends upon the selected mode and the settings of the First and Last step section (see below). Examples: first step = 2, last 1a Manual Mode (knob)/ 1c Anzeige (LEDs) step = 7.
  • Page 441 System A - 100 A-154 doepfer Sequencer Controller 2a Manual First (knob) actually always the same step is addressed due to the settings of first and last step! If you do not want to use 2b First CV (knob) / " First CV (socket)
  • Page 442 A-154 System A - 100 Sequencer Controller doepfer Another example is to control the clock rate by one of 6a Manual Start (button) / &a Ext. Start (socket) the A-155 CV outputs. This leads to a different time 6b Manual Stop (button) / &b Ext. Stop (socket) length (or different tempo) for each step, i.e.
  • Page 443 System A - 100 A-154 doepfer Sequencer Controller Operating the reset button prepares the sequencer to 7a 8/16 Steps (switch) jump to the first step as soon as the next clock signal (!) 7b 9-16/A3 (LED) / / 1-8/9-16 (socket) appears.
  • Page 444 A-154 System A - 100 Sequencer Controller doepfer Fig. 2 shows how to patch the upper trigger rows and the upper CV rows of two A-155 with A-154 and A-150. Fig. 2: Connection of A-154 with two A-155 and A-150...
  • Page 445 System A - 100 A-154 doepfer Sequencer Controller The position of switch 7a determines if the A-154 mana- 8 Man On/Off (switch) / ( ext. Master (socket) ges 8 or 16 steps. Only in position "16" the additional This group of elements defines if the A-155 is controlled address signal A3 is generated that is required to control by it's "old"...
  • Page 446 A-154 System A - 100 Sequencer Controller doepfer 5. User Examples not yet ready...
  • Page 447 System A - 100 A-154 doepfer Sequencer Controller Appendix: Connection A-154 – A-155 (1) Disconnect the 10 pin ribbon cable leading from the connector ST1 of the small A-155 controller board to the bus board. This cable is no longer required. But you may keep it as a bus cable replacement (for other modules with 10 pin connectors).
  • Page 448 System A - 100 Sequencer Controller doepfer Two 10 pin ribbon cables come from the A-154. One (A) with a 10 pin female connector (A1) at its end and another (B) with two female connectors equipped with pin headers (B1, B2). One of the pin headers (B2) is provided with a second "blind"...
  • Page 449 System A - 100 A-154 doepfer Sequencer Controller (4) Connect B1 with the female connector at the end of the ribbon cable that was removed from ST2 of the small A- 155 controller board (this cable leads to the potentiometer and trigger boards of the A-155). The male pin header in- serted into female connector B1 is used to establish this connection.
  • Page 450 System A - 100 Sequencer Controller doepfer In case that two A-155 have to be controlled by the A-154 the second A-155 has to be connected in this way: Carry out steps (1) and (2) as described above even for the second A-155. Step (3) is not applicable. Step (4) is carried out as described above but B2 is used instead of B1.
  • Page 451 System A - 100 A-155 doepfer Analog / Trigger Sequencer 1. Introduction The lower row of eight knobs has the ability to accept an external signal for each step, in which case the knobs act as attenuators for this voltage.
  • Page 452 A-155 System A - 100 doepfer Analog / Trigger Sequencer 2. Overview ➂ – — ➈ A-155 Analog / Trigger Sequencer Trigger Outputs Control Trig. Start Control ➁ Trig 1 Stop Trig 2 ➀ Step Trig 3 Gate Reset ➃...
  • Page 453 System A - 100 A-155 doepfer Analog / Trigger Sequencer Controls In / Outputs 1 Switches : these select triggers and/or gates for ! Trigger Out : outputs for the three triggers and each step one gate " Control :...
  • Page 454 A-155 System A - 100 doepfer Analog / Trigger Sequencer 3. Controls Trig. 1 1 Switches Trig. 2 Trig. 3 The three-position toggle switches 1 are used to select whether a particular step outputs a trigger signal Gate on its respective row.
  • Page 455 System A - 100 A-155 doepfer Analog / Trigger Sequencer 4 CV knobs (upper row) 6 Range You use the CV knobs 4 (upper row) to set the The position of the Range switch (a three-way toggle voltage output for each step in the upper analog CV switch) 6 selects the precise voltage control range, row.
  • Page 456 A-155 System A - 100 doepfer Analog / Trigger Sequencer a speed determined by the Glide control knob (fig. 2). 9 Control The control section 9 includes four push-buttons for If you patch the output from the Gate row into the manual sequencer control.
  • Page 457 System A - 100 A-155 doepfer Analog / Trigger Sequencer 4. In / Outputs Clock (step) and Reset inputs, on the other hand, work by sensing level: so, for instance, Reset will always be active (keeping the ! Trigger Outputs...
  • Page 458 A-155 System A - 100 doepfer Analog / Trigger Sequencer • Glide Ctrl. $ External CV / Audio Inputs : The glide function is active whenever the control signal input here is “low”. The inputs $ for the lower analog CV row can be H: If nothing’s connected to the...
  • Page 459 System A - 100 A-155 doepfer Analog / Trigger Sequencer Trigger row 1 (steps 1, 2, 3 and 5 selected) picks out Interesting effects can be obtained by patching exter- the accented notes, by triggering an ADSR, which nal control voltages (e.g. from an LFO or Random controls the VCA.
  • Page 460 A-155 System A - 100 doepfer Analog / Trigger Sequencer Clock A-155 Reset Trig. 1 Trig. 2 Trig. 3 Gate ADSR Glide Ctrl. S&H Crtl. 1 Post Out 1 Pre Out 2 fig. 3: standard patch with VCO, VCF and glide control...
  • Page 461 System A - 100 A-155 doepfer Analog / Trigger Sequencer Clock A-155 Trig. 1 Post Out 1 Pre Out 2 VC-ADSR Decay fig. 4: controlling decay time in a VC-ADSR In fig. 4 the lower analog CV row controls the decay time of a VC-ADSR.
  • Page 462 A-155 System A - 100 doepfer Analog / Trigger Sequencer Clock A-155 ADSR Trig. 1 Trig. 3 VCA 1 VCA 2 Post Out 1 Pre Out 2 ADSR The patch in fig. 6 shows how to use the A-155 as a fig.
  • Page 463 System A - 100 A-155 doepfer Analog / Trigger Sequencer Clock Trig. In A-160 A-155 A-150 Trig. 1 Trig. 3 I/O 1 Post Out 1 Post Out 2 I/O 2 Trig. Out A-150 Trig. 1 Trig. 3 I/O 1 I/O 2 CV Out fig.
  • Page 464 A-155 System A - 100 doepfer Analog / Trigger Sequencer • Random Clock The following are some short notes with suggestions for further exploration, to act as inspiration for your The Random Clock output from the A-117 can give own patching ideas.
  • Page 465 System A - 100 A-156 doepfer Quantizer 1. Introduction Module A-156 (QNT) is a dual control voltage quan- A-156 tizer. For each of the two sections, the control voltage ap- CV In plied to the input is converted into the nearest quanti- zed (i.e.
  • Page 466 A-156 System A - 100 doepfer Quantizer 2. Overview Controls: 1 switch : 3-position switch for scale type A-156 (chromatic, major, minor) Dual Quantizer 2 switch : 3-position switch for mode (scale, chord, fundamental + fifth) Ë Ê 3 switch :...
  • Page 467 System A - 100 A-156 doepfer Quantizer 3. Basic Principles A quantizer consists of an analog/digital converter (ADC) and a digital/analog converter (DAC). The vol- tage applied to the analog input of the ADC is conver- ted into digital information (e.g. 6 bit = 64 steps). The DAC converts this digital information back into a quan- tized analog voltage in the same voltage range.
  • Page 468 A-156 System A - 100 doepfer Quantizer 4. Controls 2 Switch The 3-position switch 2 determines the output 1 Switch mode. The 3-position switch 1 determines the scale type. In the "Scale" position all voltages corresponding to the scale selected with switch 1 (major or minor) are In position "All"...
  • Page 469 System A - 100 A-156 doepfer Quantizer In the “Quint" position only voltages corresponding to If switch 1 is in the "All" position the switches 2 the fundamental or the fifth are passed to the control and 3 have no function. Likewise switch 3 has voltage output (see fig.
  • Page 470 A-156 System A - 100 doepfer Quantizer Trig. 5. In / Outputs ! CV In • % CV In Socket ! and % are the inputs for the quantizers 1 and 2 respectively. The control voltage to be quantized is patched into these sockets.
  • Page 471 System A - 100 A-156 doepfer Quantizer $ Trig. Out • ( Trig. Out As the input and output range for all control At the trigger outputs $ and ( a trigger pulse of voltages is 0...+10 V the CV outputs " and &...
  • Page 472 A-156 System A - 100 doepfer Quantizer 6. User examples In the patch in fig. 7 LFO1 is reset every 16 trigger events to obtain a periodic arpeggio with 16 “notes“. There are manifold applications for the A-156 as any...
  • Page 473 System A - 100 A-156 doepfer Quantizer Offset A-156 LFO 1 A-129 /3 CV In Minor CV Out Chord Options Trig. In Reset Trig. Out Transpose CV 1+2 / 16 LFO 2 A-160 Gate ADSR ADSR MIDI A-190 fig 7: arpeggio-like sound patterns...
  • Page 474 A-156 System A - 100 doepfer Quantizer If an ADSR is used as a control voltage source the Instead of the lower sequencer a MIDI key- A-129/3 is no longer required as the ADSR generates board in combination with a MIDI-to-CV inter- only positive voltages.
  • Page 475 System A - 100 A-156 doepfer Quantizer Clock A-156 A-155 CV In Trig. 1 CV Out Trig. In Trig. Out Pre Out 1 CV In CV Out Pre Out 2 Options Trig. In Trig. Out Transpose CV 1+2 A-160 Gate A-155 Trig.
  • Page 476 A-156 System A - 100 doepfer Quantizer 7. Patch-Sheet The following diagrams of the module can help you A-156 A-156 A-156 recall your own Patches. They’re designed so that Dual Quantizer Dual Quantizer Dual Quantizer a complete 19” rack of modules will fit onto an A4 sheet of paper.
  • Page 477 System A - 100 A-160 doepfer Clock Divider 1. Introduction Module A-160 (Clock Divider) is a frequency divider A-160 for clock signals, designed to be a source of lower frequencies, particularly for rhythm uses. CLOCK DIVIDER Trig. The Trigger input will take clock signals from, eg., an LFO, MIDI sync, or the gate from a MIDI-CV interface.
  • Page 478 A-160 System A - 100 doepfer Clock Divider 2. Overview Indicators: 1 LED : Clock / 2 indicator A-160 2 LED : Clock / 4 indicator CLOCK 3 LED : Clock / 8 indicator DIVIDER 4 LED : Clock / 16 indicator Trig.
  • Page 479 System A - 100 A-160 doepfer Clock Divider 3. Indicators § /2 ... ( /64 1 LED ... 6 LED Sockets § to ( are the A-160 outputs, from which the LEDs 1 to 6 indicate the status of each of the sub- sub-divided clock signals are available.
  • Page 480 A-160 System A - 100 doepfer Clock Divider I/ O 1 A-131 A-160 A-150 CL O CK A udio DIV IDE R I/O 2 Tri g. Retrigger Gat e Gate ADSR A-160 A-131 C L OC K DIV IDER Tri g.
  • Page 481 System A - 100 A-161 doepfer Clock Sequencer 1. Introduction Module A-161 is an eight-step Clock Sequencer A-161 which is internally connected to the Clock Divider (A-160). Eight outputs are sequentially switched by Clock Sequencer the clock signals from the A-160 (see Fig. 1) and can act, for instance, as sequential rhythmic triggers for an envelope.
  • Page 482 A-161 System A - 100 doepfer Clock Sequencer 2. Overview Indicators: 1 LED ... 8 LED : Status indicators for each output A-161 CLOCK SEQUENCER Outputs: ➀ ! 1 ... ( 8 : Outputs ➁ ➂ ➃ ➄ ➅ ➆...
  • Page 483 System A - 100 A-161 doepfer Clock Sequencer 3. Indicators 1 LED ... 8 LED LEDs 1 to 8 are the status indicators for outputs ! to 4. Outputs ! 1 ... ( 8 Outputs ! to ( are the source of the sequential triggers that the A-161 puts out (see Fig.
  • Page 484 A-161 System A - 100 doepfer Clock Sequencer 5. User examples A new note played on the keyboard starts a new pattern. "Rhythmatising" notes By altering parameters on the ADSRs, you can In the example in Fig. 2 (see next page) notes played change respective note lengths and create syncopati- on the keyboard are ‘rhythmatised’: ie.
  • Page 485 System A - 100 A-161 doepfer Clock Sequencer Gate A-138 a +/- Out A-165 ADSR 1 ADSR 2 ADSR 3 ADSR 4 Reset Reset A-160 A-161 Abb. 2: "Rhythmatising” notes Instead of an LFO, you can also use MIDI- clock signals from a MIDI/CV interface (such as the A-190) to produce MIDI - syn- chronised patterns.
  • Page 486 A-161 System A - 100 doepfer Clock Sequencer Creating complex envelopes A-161 Clock A small modification to the previous patch is shown in Sequencer A-170 Fig. 3. Here, the Clock Sequencer outputs are connected to a series of Slew Limiters (A-170), to A-138 a create one very complex envelope.
  • Page 487 System A - 100 A-161 doepfer Clock Sequencer Different envelopes with each note played A-161 A-138 a Clock With the patch in Fig. 4, every time a new note is Sequencer MIXER In 1 ADSR played, a different envelope will control the VCF.
  • Page 488 A-161 System A - 100 doepfer Clock Sequencer Mini analog sequencer A-161 The patch in Fig. 5 produces a four-step mini analog A-138 a Clock Sequencer sequencer. MIXER In 1 Input 1 In 2 A clock signal either from an LFO, or a MIDI-CV...
  • Page 489 System A - 100 A-162 doepfer Dual Trigger Delay 1. Introduction Module A-162 (Dual Trigger Delay) contains two separate delay circuits for trigger signals. A-162 TDEL This module makes it possible to delay the onset of a trigger pulse, and also change its length (see Fig. 1 on page 3).
  • Page 490 A-162 System A - 100 doepfer Dual Trigger Delay 2. Overview Controls and indicators: For each trigger delay: A-162 TDEL DUAL TRIGGER DELAY 1 Del. : Delay control 2 Len. : Trigger length control ➀ Del. 3 LED : Trigger pulse output indicator ➁...
  • Page 491 System A - 100 A-162 doepfer Dual Trigger Delay 3. Controls and indicators 4. In / Outputs 1 Del. ! In This control sets the trigger delay time t (see Fig. 1) Socket ! is the A-162’s input. This is where you in a range from zero to ten seconds.

  • Page 492: Modulation Delay

    A-162 System A - 100 doepfer Dual Trigger Delay VCA. By patching in an AR envelope (in this case an 5. User examples A-170, but an A-140 could also do the job) the Modulation delay intensity of the vibrato can increase and decrease gradually.
  • Page 493 (e.g. from LFO, CV In ADSR, Random, MIDI-to-CV, Theremin, Light-to-CV, Manual analog sequencer) with attenuator. The following table shows the differences between the divider modules available in the A-100 system. A-115 A-113 A-163 fixed manually voltage contr.
  • Page 494 A-163 System A - 100 doepfer VC Frequency Divider 2. Overview Controls: 1 Manual: Control for manual setting of the integer dividing factor N A-163 VDIV 2 CV : Symmetric (negative-0-positive) attenua- VC Frequ. Divider tor for control voltage at input ! •...
  • Page 495 System A - 100 A-163 doepfer VC Frequency Divider 3. Controls The term "subharmonic " is not quite correct as the A-163 output waveform is rectange with a 1 Manual marked harmonic spectrum in contrast to the With knob 1 the divisor N is manually adjusted.
  • Page 496 A-163 System A - 100 doepfer VC Frequency Divider 4. In- / Outputs 5. User Examples ! CV In Sub-Oscillator The external control voltage (e.g. from an LFO or With the A-163 an audio sub-oscillator can be realized ADSR) used to modulate the divisor N is fed into the very simply.
  • Page 497 System A - 100 A-163 doepfer VC Frequency Divider In fig. 1 the triangle signal of a LFO (e.g. A-145) is Frequency Multiplication used to control the divisor N of the A-163. As only integer divisors occur both time and frequency quanti- In combination with the PLL module A-196 frequency zation takes place.
  • Page 498 A-163 System A - 100 doepfer VC Frequency Divider 6. Patch-Sheet The following diagrams of the module can help you A-163 VDIV A-163 A-163 VDIV VDIV recall your own Patches. They’re designed so that a VC Frequ. Divider VC Frequ. Divider VC Frequ.
  • Page 499 / digital levels (Gate, Clock, Trigger). Each half of the module TRIG. MODIF. enables signals generated by the A-100 to communi- cate with other instruments (such as an external se- quencer), or is simply used where you want to reverse a trigger polarity.
  • Page 500 A-165 System A - 100 Dual Trigger Modifier doepfer 2. Overview Indicators 1 LED : Status indicator for the inverted trig- ger signal at output § A-165 2 LED : Status indicator for the trigger pulse TRIG. MODIF. generated, and available at output $ In / Outputs Inv.
  • Page 501 System A - 100 A-165 Dual Trigger Modifier doepfer 3. Indicators § Inv. Out The inverted trigger signal is available at output § 1 LED (see Fig. 1). This LED is the status indicator for the inverted $ +/- Out trigger signal at output §.
  • Page 502 A-165 System A - 100 Dual Trigger Modifier doepfer 5. User examples Repeating notes with ping-pong echo A modification of the previous patch is shown in Fig. 3. Repeating notes played on keyboard In this case, the sound is repeated when the key is released, but this time from a different output: at the In the patch in Fig.
  • Page 503 1 and the switched contact of socket 3 is connected to input 2. A typical application is the combination of digital signals of the A-100 (gates, clocks, triggers), e.g. to obtain "gated" clocks or rhythmic clock patterns.
  • Page 504 A-166 System A - 100 LOGIC doepfer 2. LOGIC - Overview Controls: 1 LED : Display of the logical state for the A-166 Logic corresponding output Dual Logic Module In / Outputs: ! (Input) 1, 2, 3 : Inputs for the AND, OR, and XOR function "...
  • Page 505 System A - 100 A-166 doepfer LOGIC 3. Controls Inputs Outputs 1 LEDs 3 AND OR XOR NAND NEXOR The LEDs display the logical state of the correspon- ding output (on = logical “1” / high, off = logical “0” / low).
  • Page 506 The A-166 can be used to combine all kind of digital functions. The output of each state depends upon the signals of the A-100 (i.e. clock, gate or trigger signals). on the three inputs (refer to table 1). A logical “0”...
  • Page 507 System A - 100 A-166 doepfer LOGIC Fig. 1: Patch for generation of rhythmic A-160 A-161 A-166 clock signals Trig. Clock In / 16 / 32 / 64 Clock A-161 "1" A-161 "5" A-161 "7" A-166 "OR Out" A-160 "/ 8"...
  • Page 508 A-166 System A - 100 LOGIC doepfer 6. Patch-Sheet The following diagrams of the module can help A-166 Logic A-166 Logic you recall your own Patches. They’re designed so Dual Logic Module Dual Logic Module that a complete 19” rack of modules will fit onto an A4 sheet of paper.
  • Page 509 System A - 100 A-167 doepfer 1. Introduction Module A-167 compares analog voltages and deri- A-167 ves a gate signal. The state of the gate output (low/ high) depends upon which of the voltages is higher. Comparator + In It is possible to compare two external voltages (+In...
  • Page 510 A-167 System A - 100 doepfer 2. Overview Controls: 1 + IN : Attenuator for voltage at input ! 2 - IN : Attenuator for voltage at input " 3 Offs. : Offset control – ➀ 4 Gap : Control to adjust the hysteresis 5 Comp.
  • Page 511 System A - 100 A-167 doepfer 3. Basic principle Fig. 1 illustrates the Gap resp. hysteresis function by means of a triangle LFO input signal. The module generates internally the voltage U • In • In + Offset Input Signal...
  • Page 512 A-167 System A - 100 doepfer 4. Controls Original Signal 1 + In • 2 - In The controls 1 and 2 are the attenuators for the voltages fed to the sockets ! resp. ". + In + Offset Offset 3 Offs.
  • Page 513 System A - 100 A-167 doepfer 5. In - / Outputs 6. User examples The main application of module A-167 is the genera- ! + IN tion of gate signals depending upon analog volta- The input signal fed into this socket is attenuated with ges, e.g.
  • Page 514 A-167 System A - 100 doepfer Gate Control The module can even be used to add the free-running mode to each ADSR (e.g. A-140 or A-141) similar to a A-167 A-140 Gate LFO but with separate controls for rising and falling...
  • Page 515 System A - 100 A-170 doepfer Dual Slew Limiter 1. Introduction Module A-170 (Dual Slew Limiter) contains two sepa- rate slew limiters, also known as portamento control- A-170 lers or integrators. The upper SL has just one joint control, which sets Time both rise and fall times (c.
  • Page 516 A-170 System A - 100 doepfer Dual Slew Limiter 2. Overview Controls and indicators: 1 Time : rise / fall time control (input 1) A-170 2, 6 - LED : negative voltage indicator DUAL SLEW LIMITER 2, 6 + LED :...
  • Page 517 System A - 100 A-170 doepfer Dual Slew Limiter 3. Controls and indicators 1 Time This control sets the rise / fall time t of slew limiter 1 (see Fig. 1) in a range from 0 to 10 seconds. 2 - LED •...
  • Page 518 A-170 System A - 100 doepfer Dual Slew Limiter 4. In /Outputs 5. User examples Portamento ! In • § In The example in Fig. 2 shows the A-170 (upper SL !) Sockets ! (upper SL) and § (lower SL) are the slew as a portamento generator.
  • Page 519 System A - 100 A-170 doepfer Dual Slew Limiter Slew limiter as AR envelope generator When a new note is played, the carrier VCO reacts You can use the lower A-170 as a simple AR enve- immediately, while the modulator VCO glides gra- lope generator, for instance in the example in Fig.
  • Page 520 A-170 System A - 100 doepfer Dual Slew Limiter Creating complex envelopes A combination of the Clock Divider / Sequencer (A- A-161 160/161) and a number of A-170 slew limiters can Clock Sequencer produce complex envelopes (see Fig. 5). A-170...
  • Page 521 System A - 100 A-171 doepfer VC Slew Limiter 1. Introduction Module A-171 is a voltage controlled slew limiter, otherwise known as a portamento controller or inte- A-171 CV 1 grator. VC SL CV 2 Whenever there is an abrupt transition in the voltage...
  • Page 522 A-171 System A - 100 doepfer VC Slew Limiter 2. Overview Controls and indicators: 1 Rate : control governing the transition speed of the modified signal VCSL 2 CV 2 : attenuator for control voltages at " VC SLEW LIMITER...
  • Page 523 System A - 100 A-171 doepfer VC Slew Limiter 3. Controls and indicators Pay attention that the control behaviour of the A-171 is reverse that of the "normal" slew li- 1 Rate miter A-170. The control of A-171 is controls the...
  • Page 524 A-171 System A - 100 doepfer VC Slew Limiter 4. In / Outputs 5. User examples Voltage controlled slew limiting in a MIDI ! CV 1 • " CV 2 system The transition speed produced by the A-171 depends Unlike the A-170 Slew Limiter, the A-171 can have the on a combination of the setting on the Rate control, rate of rise and fall voltage controlled.
  • Page 525 System A - 100 A-171 doepfer VC Slew Limiter Slew Limiter as VC AR generator MIDI You can also use the A-171 as a simple AR genera- tor, for instance with the percussive sound in the example in Fig. 3. The attack/release parameters can...
  • Page 526 A-171 System A - 100 doepfer VC Slew Limiter Producing complex controllable modulati- Try expanding this patch by adding another control voltage ingredient into the inputs at With a combination of a Clock Divider / Sequencer the A-138 mixer, as well as the envelopes...
  • Page 527 System A - 100 A-171 doepfer VC Slew Limiter A-160 A-161 A-191 Clock Clock A-138 a MIDI Divider Sequencer MIXER In 1 A-171 MIDI In Input 1 Trig. S90 /LFO In 2 Input 2 In 3 Input 3 In 4...
  • Page 528 A-171 System A - 100 doepfer VC Slew Limiter 6. Patch-Sheet The following diagrams of the module can help VCSL VCSL VCSL you recall your own Patches. They’re designed so VC SLEW LIMITER VC SLEW LIMITER VC SLEW LIMITER that a complete 19” rack of modules will fit onto an...
  • Page 529 System A - 100 A-172 doepfer MAX / MIN 1. Introduction Module A-172 is a Minimum/Maximum selector. It A-172 has available four analog inputs and two analog MAX / MIN outputs (Minimum and Maximum). In 1 The module permanently picks the maximum resp.
  • Page 530 A-172 System A - 100 MAX / MIN doepfer 2. Overview Controls and indicators: 1 Max, Ctr. : monitoring LEDs for Maximum output 2 Min. Ctr. : monitoring LEDs for Minimum – output — In- / Outputs: ˜ ! In 1 ... $ In 4 : Signal inputs ™...
  • Page 531 System A - 100 A-172 doepfer MAX / MIN 3. Basic principles 4. Controls The module permanently picks the maximum resp. 1 Max. Ctr. • 2 Min. Ctr. minimum voltage out of the four analog input signals These LEDs display the positive resp. negative part of and outputs these voltages to the maximum resp.
  • Page 532 A-172 System A - 100 MAX / MIN doepfer 5. In- / Outputs A-129 /3 A-172 MAX / MIN Atten. ! In 1 $ In 4 In 1 In 1 In 1 Out 1 Offset The input signals are connected to these sockets. At Atten.
  • Page 533 Module A-174 is an universal two-dimensional control voltage source to control the parameters of other Offset A-100 modules by hand, e.g. filter frequency or reso- nance (VCF), loudness or modulation depth (VCA), stereo-panning (A-134), quad-panning (2xA-134), pha- sing (A-125), frequency shift (A-126), morphing (A-135...
  • Page 534 A-174 System A - 100 doepfer Joy Stick Controls: 2. Overview 1 X Y : Joy Stick (cross potentiometer) A-174 Joy Stick 2 Offs. : Offset control for Y control voltage Joy Stick controlled CV 3 LED’s : Display of Y control voltage 4 Offs.
  • Page 535 System A - 100 A-174 doepfer Joy Stick 3. Controls The joy stick used in the A-174 module is 1 X Y Joy Stick spring-loaded, i.e. the lever returns back to the neutral position as soon as it is released.
  • Page 536 This socket outputs the Y control voltage controlled the A-100 system that is voltage controlled. Thus there by vertical movement of the joy stick lever. are manifold applications depending upon the modules available in the existing A100 system.
  • Page 537 System A - 100 A-174 doepfer Joy Stick Audio In A-130 A-130 A-174 A-130 A-130 A-130 A-175 A-130 A-175 The patch in fig. 1 shows how a A-174 can be used to Fig. 1: Controlling the virtual position of an audio...
  • Page 538 A-174 System A - 100 doepfer Joy Stick 6. Patch-Sheet A-174 A-174 Joy Stick Joy Stick The following diagrams of the module can help you Joy Stick controlled CV Joy Stick controlled CV recall your own Patches. They’re designed so that a complete 19”...
  • Page 539 System A - 100 A-175 Dual Voltage Inverter doepfer 1. Introduction Module A-175 (Dual Voltage Inverter) is exactly what A-175 it says it is: two identical inverters, which will take a voltage and output it in an inverted form - so that an VOLT.
  • Page 540 A-175 System A - 100 Dual Voltage Inverter doepfer 2. Overview Indicators 1 LEDs : Visual indicators of the state of the A-175 output voltage (positive or negative) VOLT. INV. In- / Outputs ! In : Voltage input, linked to input "...
  • Page 541 System A - 100 A-175 Dual Voltage Inverter doepfer 3. Indicators 4. In- / Outputs 1 LEDs ! In • " In Visual indicators of the state of the output voltage Sockets ! and " are the internally linked inputs for (positive or negative) at socket §.
  • Page 542 A-175 System A - 100 Dual Voltage Inverter doepfer 5. User examples The changing state of the LFO voltages results in corresponding changes in the perceived position of the Panning sound in the stereo picture. Fig. 1 shows a typical patch to create Panning - the shifting of a sound’s position in the stereo picture.
  • Page 543 System A - 100 A-175 Dual Voltage Inverter doepfer VCO 1 VCA 1 VCO 1 VCO 2 VCA 2 Gain > 0 VCO 2 A-175 CV 1 Fig. 2: Mirroring a series of notes A-175 Fig. 3: AM with timbre control AM with control of timbre The example in Fig.
  • Page 544 A-175 System A - 100 Dual Voltage Inverter doepfer 6. Patch-Sheet The following diagrams of the module can help A-175 A-175 A-175 you recall your own Patches. They’re designed so VOLT. INV. VOLT. INV. VOLT. INV. that a complete 19” rack of modules will fit onto an A4 sheet of paper.
  • Page 545 System A - 100 A-176 doepfer Control Voltage Source 1. Introduction Module A-176 (Control Voltage Source) provides three voltage sources, to use wherever an extra CV is required. Contr. Volt. Source CV 1 The top two voltage sources (CV 1 and CV 2) have...
  • Page 546 A-176 System A - 100 doepfer Control Voltage Source 2. Overview Controls: 1 CV 1 : Coarse control for the voltage at linked outputs ! and " 2 Fine : Fine control for the voltage at linked Contr. Volt. Source outputs ! and "...
  • Page 547 System A - 100 A-176 doepfer Control Voltage Source 3. Controls 4. Outputs 1 CV 1 • 3 CV 2 ! CV 1 • " CV 1 Controls 1 and 3 provide coarse adjustment of the These are the internally connected parallel outputs voltages at outputs ! and ", and §...
  • Page 548 A-176 System A - 100 doepfer Control Voltage Source 5. User examples Improving tuning on the A-110 VCO In contrast with the A-111 High End VCO, the A-110 Expanding other modules’ facilities standard VCO only has one control (Tune) for tuning.
  • Page 549 System A - 100 A-176 doepfer Control Voltage Source Control voltage CV can also come from a sequencer A-110 SYNC (for instance the A-160 / A-161 or MAQ 16/3), to change volume levels each time a pattern repeats. Range CV 1...
  • Page 550 A-176 System A - 100 doepfer Control Voltage Source 6. Patch-Sheet The following diagrams of the module can help you recall your own Patches. They’re designed so Contr. Volt. Source Contr. Volt. Source Contr. Volt. Source that a complete 19” rack of modules will fit onto an...
  • Page 551 System A - 100 A-178 doepfer Theremin 1. Introduction Module A-178 (Theremin Voltage Source) produces a variable control voltage which gets bigger the A-178 closer your hand gets to its antenna. Theremin Volt. Source You can use this control voltage in any modulation or...
  • Page 552 A-178 System A - 100 doepfer Theremin 2. Overview Controls: 1 Offset : control for setting the null (zero) point 2 LEDs : LEDs to give a visual indication of the A-178 THER voltage present at output " Theremin Volt. Source...
  • Page 553 System A - 100 A-178 doepfer Theremin 3. Basic principles 4. Controls The theremin acts as one plate of a capacitor and a 1 Offset human body as the other plate. Moving the hand Control 1 is used to adjust the null point, so that the towards and away from the antenna produces tiny control voltage at output "...
  • Page 554 A-178 System A - 100 doepfer Theremin 5. In / Outputs 2 LEDs ! Antenna The LEDs 2 indicate the state of the voltage at CV outputs " and §. Use socket ! to connect the antenna. 3 LED If you use any other antenna than the te- lescopic one provided, and find that it’s not...
  • Page 555 System A - 100 A-178 doepfer Theremin 6. User examples Theremin module A-178 provides a further source of control for real-time sound manipulation and creation A-178 A-178 (so see also the suggestions in the manual for the Foot Controller, module A-177).
  • Page 556 A-178 System A - 100 doepfer Theremin In the patch in fig. 3, just a quick movement of one hand can control both the frequency of the VCO, and a rapid repeat of the envelope controlling the VCA, and A-178...
  • Page 557 System A - 100 A-178 doepfer Theremin Patch-Sheet The following diagrams of the module can help you recall your own Patches. They’re designed so that a complete 19” rack of modules will fit onto an A4 sheet of paper. A-178 THER Theremin Volt.
  • Page 558 A-178 System A - 100 doepfer Theremin The different pcb versions can be distinguished by the 8. Appendix pcb printings: V1: no version imprint On the board a trimming inductor resp. trimming V2: imprint "Theremin Controller Version 2 / 1998"...
  • Page 559 System A - 100 A-180 doepfer MULTIPLES 1. Introduction Module A-180 (MULTIPLES) is a multi-connector. A-180 It has eight inter-connected sockets, so that you can MULTIPLES patch more inputs or outputs into any module. The sockets can be split into two groups of four by disconnecting an internal solder bridge.
  • Page 560 A-180 System A - 100 doepfer MULTIPLES 2. Overview In / Outputs ! ... (: 8 interconnected sockets A-180 By removing the internal solder link between MULTIPLES sockets $ and % you can split the multiples into two groups of four: Group 1: sockets ! to $ Group 2: sockets % to (.
  • Page 561 MULTIPLES 2 The upper section has three inter-linked sockets, including one 6.3 mm mono jack socket. This makes it easy to connect the A-100 to the big scary world of quarter-inch jack connectors, without having to use a special cable.
  • Page 562 A-181 System A - 100 doepfer MULTIPLES 2 2. Overview In / Outputs !, ", § : three internally linked sockets, one of which (!) is a 6.3 mm mono jack A-181 socket MULTIPLES 2 socket for 6.3 mm stereo jack...
  • Page 563 The gate and CV inputs on the A-185 are used to patch external gate and/or CV signals into the A-100 system bus; while the internal system bus CV and gate signals are available at the gate and CV Gate outputs of the A-185.
  • Page 564 A-185 System A - 100 doepfer Bus Access 2. Overview Controls: A-185 1 Contr. : system bus gate indicator LED BUS ACCESS 2 Contr. : system bus CV indicator LED Gate Contr. ➀ In / Outputs: Gate ! Gate In : input for external gate signal ", §...
  • Page 565 System A - 100 A-185 doepfer Bus Access 3. Controls 4. In / Outputs 1 Contr. ! Gate In LED indicator 1 shows the state of the gate signal on Use gate input ! for patching in external gate si- the system bus.
  • Page 566 VCOs from the same common sy- stem bus, the internal CV voltage can drop sufficiently If your System A-100 fits into just one 6U rack, and you for the keyboard scaling to go slightly out, causing high want to connect up the upper and lower system bus- notes to be annoyingly out of tune.
  • Page 567 CV 1 Arpeg. Retrig. Bend W. CV 2 CV 2 A-185 BUS ACCESS Gate Contr. Gate Gate Contr. Frame 1 Frame 2 Frame 3 Rahmen 1 Rahmen 2 Rahmen 3 fig. 2: Connecting the system busses on a multiple-rack A-100 system...
  • Page 568 In this “read-only” mode, the input sockets are disconnected from the system bus (see fig. 3). CV In CV Out (front panel) (front panel) refresh amplifier A-100 bus fig. 3: example of “read-only” mode with CVs...
  • Page 569 System A-100 BBD Module A-188-1 DOEPFER DOEPFER DOEPFER DOEPFER 1. Introduction Module A-188-1 is a so-called Bucket Brigade Device module (abbr. BBD). BBDs have been used to delay audio signals before digital delays dethroned the BBD based effect units. But BBDs have some very unique...
  • Page 570 System A-100 BBD Module A-188-1 DOEPFER DOEPFER DOEPFER DOEPFER 2. Basic Principles voltage) is passed on, because some drops of water go wrong and at the end of the chain not the same amount of water (resp. not exactly the same voltage) appears. In a...
  • Page 571 System A-100 BBD Module A-188-1 DOEPFER DOEPFER DOEPFER DOEPFER The following table shows the relation between clock frequency, delay time and number of stages for some typical BBD circuits. Relation between clock frequency [kHz] and delay time [ms] BBD circuit...
  • Page 572 System A-100 BBD Module A-188-1 DOEPFER DOEPFER DOEPFER DOEPFER Fig. 3: A-188-1 module scheme...
  • Page 573 System A-100 BBD Module A-188-1 DOEPFER DOEPFER DOEPFER DOEPFER Fig. 3 shows the internal details of the module A-188-1: the The clock output of the HSVCO is normalled to the clock upper part is the actual BBD section, the lower part the high input of the BBD section.
  • Page 574 System A-100 BBD Module A-188-1 DOEPFER DOEPFER DOEPFER DOEPFER The following sketch shows the effect of normal/inverted The polarity of the feedback signal leads to clearly audible mixing by means of a simple sawtooth signal as audio input. different sounds as different frequencies are emphasized or attenuated for positive or negative feedback.
  • Page 575 System A-100 BBD Module A-188-1 DOEPFER DOEPFER DOEPFER DOEPFER Controls: 3. Overview Delay Clock : manual delay control CV2: attenuator for CV2 Level: audio input attenuator Feedback: feedback level control Mix: mix control (original/BBD) Polarity: CV1 polarity Polarity: CV2 polarity...
  • Page 576 System A-100 BBD Module A-188-1 DOEPFER DOEPFER DOEPFER DOEPFER 4. Controls and In- / Outputs 4.1. High Speed VCO Section Delay Clock : manual delay control CV1: CV1 input HSVCO Polarity: CV1 polarity & CV2: CV2 input HSVCO Polarity: CV2 polarity...
  • Page 577 System A-100 BBD Module A-188-1 DOEPFER DOEPFER DOEPFER DOEPFER Consequently for all clock patches from and to the A-188-1 clock suppression. But the CV output can be used for other only short patch cables (~ 30 cm) should be used as long applications as well, e.g.
  • Page 578 System A-100 BBD Module A-188-1 DOEPFER DOEPFER DOEPFER DOEPFER 4.2. BBD Section behaviour depends also upon the BBD circuit used in the module. " Ext. Clk In: BBD clock input BBD Out: BBD output This is the clock input of the BBD section and is internally Socket ) is the "raw"...
  • Page 579 System A-100 BBD Module A-188-1 DOEPFER DOEPFER DOEPFER DOEPFER The position of the polarity switch 9 defines if the normal or Knob 4 Feedback adjusts the feedback level. In the left/ccw the inverted BBD signal is mixed to the original signal position of the knob no feedback (or resonance/emphasis) is (please refer to page 6 concerning this function).
  • Page 580 System A-100 BBD Module A-188-1 DOEPFER DOEPFER DOEPFER DOEPFER 5. User Examples Voltage Controlled Feedback Standard Flanger Patch Feedback is processed by an external voltage controlled Suitable control voltage sources are LFO (A-145 as shown polarizer (A-133) to obtain voltage controlled feedback.
  • Page 581 System A-100 BBD Module A-188-1 DOEPFER DOEPFER DOEPFER DOEPFER Filtered Feedback "Enveloped" BBD The feedback loop is processed by an external filter. The Control voltage for the A-188-1 is generated by the example shows an A-124 Wasp filter in the feedback loop.
  • Page 582 System A-100 BBD Module A-188-1 DOEPFER DOEPFER DOEPFER DOEPFER Basic Karplus/Strong Synthesis Patch Clock Filter CV and gate are delivered e.g. by a sequencer, ribbon The BBD audio output is filtered with a low pass (e.g. A- controller, Midi-to-CV interface or Theremin. The time 108).
  • Page 583 System A-100 BBD Module A-188-1 DOEPFER DOEPFER DOEPFER DOEPFER Karplus/Strong Random melody patch (A149/1) This patch shows another example for the Karplus/Strong The patch generates a random melody. The tempo is synthesis. The LFO A-145 is used as clock oscillator but any defined by the LFO rate, the tone range by the "N"...
  • Page 584 System A-100 BBD Module A-188-1 DOEPFER DOEPFER DOEPFER DOEPFER...
  • Page 585 System A-100 BBD Module A-188-2 DOEPFER DOEPFER DOEPFER DOEPFER 1. Introduction Module A-188-2 based on a so-called Bucket Brigade Device (abbr. BBD). In contrast to the A-188-1 the A-188- 2 uses a tapped BBD circuit, i.e. the circuit has available six different outputs at the BBD stages 396, 662, 1194, 1726, 2790 and 3328.
  • Page 586 System A-100 BBD Module A-188-2 DOEPFER DOEPFER DOEPFER DOEPFER 2. Basic Principles voltage) is passed on, because some drops of water go wrong and at the end of the chain not the same amount of water (resp. not exactly the same voltage) appears. In a A BBD circuit can be regarded as a chain of Sample &...
  • Page 587 System A-100 BBD Module A-188-2 DOEPFER DOEPFER DOEPFER DOEPFER The following table shows the relation between clock frequency, used output stage (tap) and delay time for the BBD circuit used in the A-188-2 (MN3011). Table 1: Relation between clock frequency [kHz], used output (tap) and delay time [ms]...
  • Page 588 System A-100 BBD Module A-188-2 DOEPFER DOEPFER DOEPFER DOEPFER Fig. 3: A-188-2 module scheme...
  • Page 589 System A-100 BBD Module A-188-2 DOEPFER DOEPFER DOEPFER DOEPFER Fig. 3 shows the internal circuit details of the module: the clock frequency of the BBD module. The higher the slope of upper part is the high speed VCO (HSVCO), the lower part the external filter (e.g.
  • Page 590 System A-100 BBD Module A-188-2 DOEPFER DOEPFER DOEPFER DOEPFER Each tap is connected to two polarizers (the polarizer The two sub-mixers are used to mix the outputs of the six function is described on the last page). One of the polarizers BBD taps with adjustable levels and polarities.
  • Page 591 System A-100 BBD Module A-188-2 DOEPFER DOEPFER DOEPFER DOEPFER The feedback can be increased up to self-oscillation. In contrast to other feedbacks (e.g. filters or phasers) the result in the self-oscillation state depends upon the "audio history" (i.e. the contents of the BBD when the self-oscillation is triggered).
  • Page 592 System A-100 BBD Module A-188-2 DOEPFER DOEPFER DOEPFER DOEPFER 3. Overview § " & Fig.5: A-188-2 front panel...
  • Page 593 System A-100 BBD Module A-188-2 DOEPFER DOEPFER DOEPFER DOEPFER Controls: In- / Outputs: mix levels/polarities of the BBD taps CV1: CV1 input HSVCO 3328, 2790, 1726, 1194, 662 and 396 " CV2: CV2 input HSVCO (polarizers) § Clk Out: clock output HSVCO...
  • Page 594 System A-100 BBD Module A-188-2 DOEPFER DOEPFER DOEPFER DOEPFER 4. Controls and In- / Outputs 4.1. High Speed VCO Section Delay : manual delay/clock control CV1: CV1 input HSVCO " CV2: CV2 input HSVCO CV2: attenuator for CV2 § Clk Out:...
  • Page 595 188-2 into socket %. Adjust the Level control 5 so that the output signal does not distort - unless you want to obtain distortion. For normal A-100 levels (e.g. VCO A-110) distortion appears at about three o'clock position of control...
  • Page 596 System A-100 BBD Module A-188-2 DOEPFER DOEPFER DOEPFER DOEPFER & Single Outputs Ext.FB In: external feedback input Feedback: feedback level and polarity control The six sockets ) are the "raw" outputs (taps) of the BBD (polarizer) stages 3328, 2790, 1726, 1194, 662 and 396. These outputs can be used e.g.
  • Page 597 System A-100 BBD Module A-188-2 DOEPFER DOEPFER DOEPFER DOEPFER 5. User Examples Standard Modulation Patch Voltage Controlled Feedback Suitable control voltage sources are LFO (A-145 as shown The feedback is processed by an external voltage controlled in the example, A-146, A-147, A-143-3), random voltage (A- polarizer (A-133) to obtain voltage controlled feedback.
  • Page 598 System A-100 BBD Module A-188-2 DOEPFER DOEPFER DOEPFER DOEPFER Clocked or voltage controlled feedback type The single outputs of the A-188-2 are patched to the inputs Clock Filter of the addressed switch A-152. The common output of the A-152 is patched to the feedback input of the A-188-2. The The BBD audio output is filtered by a low pass (e.g.
  • Page 599 System A-100 BBD Module A-188-2 DOEPFER DOEPFER DOEPFER DOEPFER Voltage controlled output mixing Four of the single outputs of the A-188-2 are patched to the audio inputs of a voltage controlled mixer A-135-1. The four control voltages of the A-135-1 are used to define the levels of the BBD taps.
  • Page 600 System A-100 BBD Module A-188-2 DOEPFER DOEPFER DOEPFER DOEPFER...
  • Page 601 The A-190 is a MIDI-CV/SYNC Interface, with which Clock Divider / Sequencer or can produce MIDI- you can control any A-100 Module which has CV and synchronised gates (for instance on an ADSR). MIDI gate/trigger input sockets by MIDI. START or CONTINUE messages make the voltage at...
  • Page 602 A-190 System A - 100 doepfer MIDI-CV/SYNC Interface 2. Overview Controls and indicators 1 Group : Button to select which menu section A-190 MCVS (out of the Config and Performance menus), is available for editing MIDI-CV/SYNC INTERF. MIDI 2 Menu : Button to select items in Edit Mode, ➀...
  • Page 603 MIDI-Start or Continue): low voltage described correctly (see p. MIDI-Stop: high voltage. % GATE : GATE signal output; normally connec- ted internally to the A-100 system bus (INT.GATE line), but can be dis- connected. & CV 1 : Output for control voltage 1 (D/A converter 1);...
  • Page 604 3. Starting to use the A-190 H The gate output % and CV1 output & are automa- tically connected to the system bus of the A-100, so don’t use patch cables to connect these, unless you N.B. if you’re using more than one A-190: have cut the links, or wish to connect to a module whose system bus isn’t connected with the A-190’s...
  • Page 605 System A - 100 A-190 doepfer MIDI-CV/SYNC Interface 4.1 Using the A-190 and portamento time - the sort of parameters to which you need easy and frequent access . On power up, the A-190 defaults to Performance The Config menus, on the other hand, contain confi- mode.
  • Page 606 A-190 System A - 100 doepfer MIDI-CV/SYNC Interface Pressing the Group button 1 switches to the other Edit Mode, Menu 1 menu group - the button acts as a toggle switch. A mini-light-show indicates which group is selected: Sequence of lights You can tell which menu group you’re in by checking...
  • Page 607 System A - 100 A-190 doepfer MIDI-CV/SYNC Interface Switching back to performance mode MENU MENU MENU When you’ve made the change to the parameter you wanted to alter, you can either change other parame- ters in the same menu, or go on to the next menu by...
  • Page 608 REF. NOTE sets the bottom note on the MIDI key- time you may need to alter it is to control board which will play the lowest note on the A-100 certain other makes of synthesizer. VCOs. As a rule, this is MIDI note number 36.
  • Page 609 (1V / octave). M M M M OFF : PROG CHANGE 5 For use just with the A-100, the V / octave ON : PROG CHANGE 6 response is all that is needed. The Hz / V option is provided purely for connecting to external synths which use that standard.
  • Page 610 MIDI Clock pulses are 1/96th Note. By setting the at output §. amount by which the clock is divided, you can choose different note lengths: For use just with the A-100, select "positive". The negative setting is provided just for divisor clocks per note...
  • Page 611 This parameter sets the voltage offset for the bottom note - and works in the same way as the VCO’s Tune For use just with the A-100, it may well be control. In normal use, this is set to 0 V.
  • Page 612 A-190 System A - 100 doepfer MIDI-CV/SYNC Interface CV 2 Config Menu 5 Retrig. SCALE RTRIG. TIME This parameter sets the gate retrigger time - ie. the time that elapses before another gate signal received triggers the envelopes. When setting this, always start with the shortest possi- ble retrigger time (1 ms), and see if the connected REF.NOTE...
  • Page 613 System A - 100 A-190 doepfer MIDI-CV/SYNC Interface Note that you can make the A-190 learn whatever MIDI controller you choose as the source for DAC 2, simply by sending it Config Menu 6 via MIDI IN while in Config menu 6.
  • Page 614 1, where control is if you keep them pressed down. more direct. With the A-190, you’re effectively getting an extra software LFO, controlled over MIDI, which can supplement the ‘real’ LFOs (A- 145, A-146) in your A-100 system.
  • Page 615 System A - 100 A-190 doepfer MIDI-CV/SYNC interface This MIDI function is like a software version Performance Menu 3 Glide of the A-170 Slew Limiter. GLIDE TIME The Glide Time parameter controls the length of the portamento time in the A-190’s built-in glide / porta-...
  • Page 616 The BEND WIDTH parameter sets the pitch bend range. For example, if you set the range to a whole tone, the pitch bender on your MIDI instrument will alter the A-100’s VCO pitch by a maximum interval of a semi-tone up or down.
  • Page 617 A-100 only stores these changes temporarily, and step the instant before it’s saved, because of they’ll be lost when you switch the A-100 off. To store the physical difficulty of pressing the INC and any changes in the set-up, you have to save the DEC buttons at precisely the same time.

  • Page 618: Performance Mode

    FORMANCE menu 3). Changes made using this con- 0 ... 63 Glide Off troller are only temporary: they are not stored during 64 ... 127 Glide On the ‘save’ procedure, and on power-up, the A-100 will revert to the default factory setting.
  • Page 619 ‘save’ procedure, and on power- switched off. up, the A-100 will revert to the default factory setting. M M M M CONTROL M M M M...
  • Page 620 MIDI-CV/SYNC interface 4.6 Initialisation (Reset) For the full reset ‘b’, do the following: D Switch the System A-100 off. When the A-190 is first switched on after leaving the factory, its memory is initialised - that is, all parame- D Press and hold buttons 1 to 4, while turning the ters are set to their standard default values (see the A-100 power back on.
  • Page 621 System A - 100 A-190 doepfer MIDI-CV/SYNC interface Parameter Value Notes CHANNEL MIDI channel 1 REF. NOTE CLOCK TIME clock frequency at output § = MIDI clock frequency CLOCK POLARITY positive: +12 V ..0 V .. RETRIGGER legato - ie. no retrigger LFO FREQ.
  • Page 622 A-190 System A - 100 doepfer MIDI-CV/SYNC interface CONFIG menu PERFORMANCE menu Default Default Parameter Setting Parameter Setting CHANNEL NOTE ON ch n vel CHANNEL INC / DEC REF. NOTE NOTE ON ch n vel LFO FREQ. ~ 3 Hz INC / DEC pos.:...
  • Page 623 CV4 are adjusted by means of the learn button. • Glide control: portamento/slew limiter function for By means of two jumpers CV1 and Gate can be connected to the corresponding lines of the A-100 bus. Fig. 1: Schematics...
  • Page 624 Midi-to-CV/Gate A-190-2 System A-100 DOEPFER DOEPFER DOEPFER DOEPFER 2. Overview Controls / Displays: Learn: Learn (momentary switch) Glide: Glide Control for CV output "Note" Gate: Gate / Learn LED ! ! ! ! In- / Outputs: Midi In: Midi input...
  • Page 625 The A-190-2 has available a jumper that allows to connect used to control even 2 or more CV inputs of VCOs without the Gate output of the module to the Gate line of the A-100 the need of an additional buffer.
  • Page 626 If the A-190-2 should be used as CV volume or velocity*volume messages. The voltage range is source for the A-100 bus the CV connection of any other CV 0 V (velocity/volume data 0) … +5V (velocity/volume data source (e.g.
  • Page 627 For this the button has to be the normal play mode. The LED can be used to control the operated during power on of the A-100 system. Then the correct function of the module – even without having other system has to be turned off and on again (with about 10 modules connected to A-190-2.
  • Page 628 Midi-to-CV/Gate A-190-2 System A-100 DOEPFER DOEPFER DOEPFER DOEPFER 5. Operation are stored non volatile parameter memory. When the A-190- 2 is turned on next time the parameter settings are taken from this memory. To adjust the A-190-2 parameters one has to enter the...
  • Page 629 System A-100 Midi-to-CV/Gate A-190-2 DOEPFER DOEPFER DOEPFER DOEPFER Function Midi message Note Comment Midi channel/reference for CV1=0V Note on CV3 velocity off Program Change #1 CV3=volume CV3 velocity on Program Change #2 CV3=volume*velocity CV4 velocity off Program Change #3 CV4=Ctr.#X...
  • Page 630 Midi-to-CV/Gate A-190-2 System A-100 DOEPFER DOEPFER DOEPFER DOEPFER Notes device which type of counting is used. If the counting type 0…127 is used one has to subtract 1 from the program change numbers in the table above. For some devices...
  • Page 631 With this function the gate polarity can be changed. The following modes are only useful if two or more A-190- Within the A-100 this features is not required because all 2 are daisy-chained via Midi Out/In by means of the envelope generators of the A-100 use positive gate internal jumpers (see attachment).
  • Page 632 V/Octave and Hz/V characteristics for the CV1 need to select the learn mode. Temporarily means that output. Within the A-100 this features is not required the changes are not stored permanently in the non- because all VCOs and VCFs use V/Oct only. Only if the...
  • Page 633 System A-100 Midi-to-CV/Gate A-190-2 DOEPFER DOEPFER DOEPFER DOEPFER 6. User Examples 6.1. Simple synthesizer standard patch with one envelope generator This is a simple synthesizer patch with one VCO A-110 that is processed by a VCF (A-124 Wasp filter in this example, but any other filter may be used) and two VCAs (Dual VCA A-132-3).
  • Page 634 Midi-to-CV/Gate A-190-2 System A-100 DOEPFER DOEPFER DOEPFER DOEPFER 6.2. Application of A-190-2 and Precision Adder A-185-2 In this application the A-185-2 is used to add up several voltages that are used to control the pitch of all VCOs that are connected to the same bus board as the A-185-2: •...
  • Page 635 Before installing the A-190-4 please read the importand note on page 5! The A-190-4 is a MIDI-CV/SYNC Interface, capable to control any A-100 Module via MIDI that provides CV and gate/trigger input sockets. The A-190-4 has two Digital-to-Analogue converters (DAC for short), which put out control voltages from -3V...
  • Page 636 DOEPFER USB/Midi-to-CV/Gate A-190-4 System A-100 The A-190-4 also has a clock output, controlled by MIDI clock. Incomming MIDI clock can be divided down to provide a variety of clock rates that enable vintage sequencers or drum machines to be synced to MIDI.
  • Page 637 DOEPFER System A-100 USB/Midi-to-CV/Gate A-190-4 Controls and Display: 2. Overview a. Display : Three-digit display shows abbriviations of functions and parameter names as well as parameter values. Return : Opens up a sub function resp. takes you to the next lower level of the menue structure (down).
  • Page 638 A-100 system (INT.GATE line) disconnected. 7. CV 1 : Output control voltage (D/A converter 1); usually connected internally to the A-100 system bus (INT. CV line) but may be disconnected if desired. May be used mainly for controlling VCO pitch.
  • Page 639 DOEPFER System A-100 USB/Midi-to-CV/Gate A-190-4 • Now power up your System A-100. The A-190-4’s 3. Setting up the A-190-4 display will show its operation software version number for about one second (e.g. 101). Please note if you are using more than one •...
  • Page 640 DOEPFER USB/Midi-to-CV/Gate A-190-4 System A-100 4. Operating the A-190-4 • Hit ”>/+“ and ”</–” buttons to move back and forth on the current menue level. By doing so, you will find six 4.1. Basic Operation different menues plus the operation software number in the upper menue level.
  • Page 641 You are able to hear the changes. • If you wish to keep your settings after powering down your A-100 system, you have to save your settings into the A-190-4’s non volatile memory. This is done with the store function covered later in this manual.
  • Page 642 DOEPFER USB/Midi-to-CV/Gate A-190-4 System A-100...
  • Page 643 DOEPFER System A-100 USB/Midi-to-CV/Gate A-190-4...
  • Page 644 Selects the desired MIDI Channel, on which your A-190-4 the pitch bender of your MIDI instrument will alter the will receive MIDI data. A-100’s VCO pitch by a maximum interval of a semi-tone up or down. Channel # 1 to #15 are available – not channel #16.
  • Page 645 Hitting ” ” leaves the value entry menue. For use with the A-100, only the V / octave setting is For use with the A-100, please leave this value at the needed. The Hz / V option is provided for connecting standard factory setting of exactly 1.00V / octave.
  • Page 646 DOEPFER USB/Midi-to-CV/Gate A-190-4 System A-100 (monophonic Aftertouch) TUNE tUn This parameter sets the voltage offset for the reference ..(MIDI controller #) note - and works the same way as the VCO’s Tune control. In normal use, this parameter is set to 0V. Thus Alternatively, you may choose any other available MIDI the default value is also ”0”.
  • Page 647 DOEPFER System A-100 USB/Midi-to-CV/Gate A-190-4 For use with the A-100, this parameter should always 4.3.3 Clock Menue Clo be set to positive. The negative setting may be useful to control certain vintage synthesizers. The clock menue covers all functions that are used to generate a clock signal from incomming MIDI data.
  • Page 648 1/32 configure the internal LFO. With the A-190-4, you’re getting an extra software generated LFO which can 1/16 supplement the ‘real’ LFOs (A-145, A-146) in your A-100 system. LFO FREQUENCY Frq You may also use the A-160 clock divider module to generate different clock divisions.
  • Page 649 (EEPROM - electrically eraseable programmable read- Initialise function). only memory) which will save your setup when powering down the A-100 system. As soon as you power up the system again, the A-190-4 will recall immediately its saved settings. If you change the settings of various parameters, the A-190-4 stores these changes only temporarily, and they will be lost when you switch off the A-100 system.
  • Page 650 DOEPFER USB/Midi-to-CV/Gate A-190-4 System A-100 4.3.6 INITIALISE Function InI Parameter Value Notes CHANNEL MIDI channel #1 You may want to erase all your parameter settings and reset the values back to their defaults. If so, please use REF. NOTE #24 / Note C2 the Initialise function.
  • Page 651 DOEPFER System A-100 USB/Midi-to-CV/Gate A-190-4 4.4 Using MIDI Controllers CONTROLLER #64 (Sustain) This controller switches sustain on and off. You already learned how to assign Velocity, Pitchbend or Monophonic Aftertouch to CV2. Next to this, the A-190-4 Value range :...
  • Page 652 DOEPFER USB/Midi-to-CV/Gate A-190-4 System A-100 CONTROLLER #92 (Tremolo) This controller affects the LFO frequency (please refer to Controller Effect Setting LFO menue / frequency parameter). When using this Cont # 01 n Modulation n = LFO voltage amount sent to controller, parameter changes are only temporary.
  • Page 653 DOEPFER System A-100 USB/Midi-to-CV/Gate A-190-4 5. Jumper Settings You may customise your A-190-4 to your needs by removing / changing positions of some jumpers on the backside of the module’s circuit board. You will find a total of seven jumpers, but only three of them are of importance.
  • Page 654 DOEPFER USB/Midi-to-CV/Gate A-190-4 System A-100 6. Application Examples 6.1. Simple synthesizer standard patch with one envelope generator This is a simple synthesizer patch with one VCO A-110 that is processed by a VCF (A-124 Wasp filter in this example, but any other filter may be used) and two VCAs (Dual VCA A-132-3).
  • Page 655 In this application the bus CV jumper of the A-190-4 has to be removed and the bus CV jumper of the A-185-2 has to be installed ! Otherwise a short circuit between both CV outputs will occure ! All rights reserved © 2014 Doepfer Musikelektronik GmbH Vers. 1.2/2014-05-14...
  • Page 656 DOEPFER USB/Midi-to-CV/Gate A-190-4 System A-100...
  • Page 657 (temporarily). If none of the 128 factory presets is suitable new presets can be programmed with the Pocket Control editor program which is available for free on our web site www.doepfer.com . The snapshot button transmits the 16 momentary states of the 16 inputs as MIDI controller messages.
  • Page 658 A-192 System A - 100 doepfer CVM 16 2. Overview Controls and indicators 1 Snapshot : Momentary switch (sends a snapshot of all the momentary CV settings) A-192 CVM16 CV-to-MIDI Interface 2 Control: LED display (- DIP switch: 8 pin switch on the A-192 pc board to...
  • Page 659 PC under Windows 95/98/2000. the inputs are in the range of -12V...+12V. This means that within the A-100 system it is not possible For a small extra charge (about US$10.00) we also to damage the A-192 module as the output voltages have available the OEM version of Emagic’s Sound-...
  • Page 660 A-192 System A - 100 doepfer CVM 16 As soon as one of the 16 input CVs changes the 4. Controls and indicators corresponding MIDI controller messages is generated. In case of a continually changing voltage (e.g. from a 1 Snapshot...
  • Page 661 System A - 100 A-192 doepfer CVM 16 The snapshot switch may even be used to set the MIDI To clear any MIDI input error such as a MIDI over- master channel. This is not as simple as for Pocket...
  • Page 662 +12V or less than -12V may damage the module. via program change is indicated by lighting up of Within the A-100 system it is not possible to damage the LED for about one second. During this period the module as no voltages beyond these limits are no incoming MIDI data is recognized (i.e.

  • Page 663: Midi Out

    Module A-192 can be used to convert any control • “Freezing” at a certain position (e.g. a vowel like “a”) voltage in the A-100 into MIDI controllers. Especially • Storing certain vowels or filter settings those applications normally not available in the world •...
  • Page 664 A-192 System A - 100 doepfer CVM 16 7. Patch-Sheet A-192 CVM16 The following diagrams of the module can help you CV-to-MIDI Interface recall your own Patches. They’re designed so that a Snapshot complete 19” rack of modules will fit onto an A4 sheet of paper.
  • Page 665 More detailed information about the presets you may no. 10 and 11. This switch is used to select one of the find on our web site www.doepfer.com in the product 128 presets after power on. As 8 switches could description and user’s manual of Pocket Control. In address 256 presets the eighth switch is unused.
  • Page 666 Preset 28: XG Drum Cutoff 00111100 Preset 60: ASR-X Masterchn 10111000 Preset 29: XG Drum Reson. 10111100 Preset 61: Doepfer MAQ 1 Mchn 01111000 Preset 30: XG Drum Attack 01111100 Preset 62: Doepfer MAQ 2 Mchn 11111000 Preset 31: XG Drum Decay...
  • Page 667 System A - 100 A-196 doepfer 1. Introduction Module A-196 contains a so-called Phase Locked A-196 Loop circuit (PLL). A PLL consists of three parts: VCO (linear voltage-controlled oscillator with rectangle output), phase comparator (PC), and low-pass filter (LPF). The three parts are connected in the A-196 with...
  • Page 668 A-196 System A - 100 doepfer 3-position switch. When PC2 is used a LED displays 2. Basic principles the "locked" state, i.e. when the frequency of the internal VCO is identical to the external frequency. The three units VCO, phase comparator (PC) and low...
  • Page 669 System A - 100 A-196 doepfer Fig. 1: Internal construction of the A-196...
  • Page 670 A-196 System A - 100 doepfer 3. Overview Controls: 1 Range : Three-position frequency range switch for the VCO 2 Offs. : Frequency offset control 3 Type : Three-position switch to select one of – ➁ the three phase comparators...
  • Page 671 System A - 100 A-196 doepfer 4. Controls Each phase comparator has its special advantages and disadvantages. E.g. PC1 locks even at harmonics, i.e. integer frequency multiples of the external signal 1 Range • 2 Offs. and the internal VCO. This is a disadvantage for the...
  • Page 672 A-196 System A - 100 doepfer 5. In- / Outputs $ In 2 (Signal In) This socket is the second signal input of the PC. The ! CV In external PLL signal input (e.g. VCO A-110 or fre- quency divider A-163) is connected to this socket.
  • Page 673 System A - 100 A-196 doepfer 6. User examples A-196 A-163 Frequency Multiplication VDIV CV In A very important application of the A-196 is frequency Manual In 1 multiplication. For this the output of the internal VCO is connected to the input of an external frequency In 2 divider (e.g.
  • Page 674 So far no filters of this type are available as A-100 modules but we are about to experiment with SCFs. The A-196 is a very experimental module and some of its functions cannot be described straight forward as for other modules.
  • Page 675 System A - 100 A-198 doepfer Trautonium / Ribbon Controller 1. Introduction Module A-198 is a so-called Trautonium resp. Rib- bon Controller. It provides variable Control Voltages A-198 and Gate signals generated by combined position / Trautonium / Ribbon Ctr.
  • Page 676 A-198 System A - 100 Trautonium / Ribbon Controller doepfer 2. Overview Controls: 1 Scale : Scale / spread control for Position Con- trol Voltage output ! 2 Hold : Hold function switch 3 LED : Gate signal indicator for Position Gate at "...
  • Page 677 System A - 100 A-198 doepfer Trautonium / Ribbon Controller If CV is used to control the VCO pitch 3. Controls the scale is adjusted with control 1 so that 1 Scale the position difference corresponds to the desired spread, e.g. 25 cm for one octave.
  • Page 678 A-198 System A - 100 Trautonium / Ribbon Controller doepfer Gate the Trautonium the sound disappears immediately if the finger is removed (no release). 3 LED Gate PRES The LED 3 monitors the Gate signal at output " that is triggered by touching the position sensor (active only in the Off position of the Hold switch).
  • Page 679 System A - 100 A-198 doepfer Trautonium / Ribbon Controller 4. In- / Outputs % Contr. Board The position and pressure sensors are located in a ! CV separate metal frame. The connection between the module and the sensor frame is made by a 4 pin cable...
  • Page 680 Both control voltages CV and CV can be used PRES to control any parameter in the A-100 that is voltage Another evident application is the usage as a manu- controlled, e.g. phase or frequency shifting (A- ally controlled voltage source that generates two...
  • Page 681 System A - 100 A-198 doepfer Trautonium / Ribbon Controller Ribbon Se ns or Pit ch V CO Ring Pos it ion A udio V CF Mod. Mix er Gate 1 V CO A-198 Contr. ADSR Board Pr e s s ur e With the ring modulator and suitable settings of the Fig.
  • Page 682 A-198 System A - 100 Trautonium / Ribbon Controller doepfer Ribbon Sensor A-156 CV In Minor A-198 CV Out Gate Chord Options Trig. In A-162 Trig. Out Transpose CV 1+2 A-150 A-177 A-150 ADSR ADSR Foot Switch Fig. 4: A-198 as a "keyboard"...
  • Page 683 System A - 100 A-198 doepfer Trautonium / Ribbon Controller determines if all semitones or only tones of the minor/ The patch can be extendend in manifold ways: major scale or notes of a chord are allowed. For details • Feeding a keyboard or sequencer pitch control please refer to the A-156 manual.
  • Page 684 A-198 System A - 100 Trautonium / Ribbon Controller doepfer 6. Patch-Sheet The following diagrams of the module can help you A-198 TRC A-198 TRC recall your own Patches. They’re designed so that Trautonium / Ribbon Ctr. Trautonium / Ribbon Ctr.
  • Page 685 Using all these features very extreme and unusual ef- Pay attention to the power supply recommendation at fects can be generated with the A-199. the end of this manual (page 6) if you are about to plan an A-100 system that includes an A-199.
  • Page 686 A-199 System A - 100 doepfer Spring Reverb 2. Overview Controls: 1 Level : Attenuator for the the audio input signal at input ! A-199 SPRV 2 Feedback : Manual feedback control, resp. Spring Reverb attenuator for external feedback signal at socket "...
  • Page 687 $. this case the reverb output § is passed through one or more A-100 modules and then fed back Pay attention to the notes concerning the posi- to socket " (refer to chapter 5: user examples).
  • Page 688 A-199 System A - 100 doepfer Spring Reverb 4. In- / Outputs 5. User examples Apart from the evident application - i.e. reverb simula- ! Audio In tion - the module can be used for timbre modification The audio signal to be provided with the reverb effect as spring reverb systems show a very characteristic is fed into audio input !.
  • Page 689 System A - 100 A-199 doepfer Spring Reverb A VCA in the feedback path e.g. leads to a voltage 50 Hz controlled (normal) feedback. Filters or filterbanks in the feedback path modify the spectral behaviour of the 75 Hz reverb effect (different to the frequency-selective re- A-128 verb described shortly).
  • Page 690 One may use the left, mitted to the “microphone” by the springs and gene- top, or rear panel of the A-100 frame to mount the rate in this way the reverb effect. reverb system. If screws are used 2 of them are The receiver (“microphone”) is very sensitive to ma-...

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