DOEPFER A-100 Manual

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DOEPFER

System A-100

Synthesizer Voice A-111-5

1. Introduction

Fig. 1: A-111-5 sketch

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Summary of Contents for DOEPFER A-100

Page 1 DOEPFER System A-100 Synthesizer Voice A-111-5 1. Introduction Fig. 1: A-111-5 sketch...
Page 2 • internal CV input for frequency (1V/octave) connected wave oscillator (not as precise as the VCO but much better than most of the other filters) to the A-100 bus via jumper, the jumper can be used to interrupt this internal connection if not wanted...
Page 3 • ADSR signal is available as an additional socket (to use • special control scale: exponential scale in the range from the ADSR signal for external modules) • Gate input connected to the A-100 bus via jumper, the about -20dB to -80/90dB, linear scale from about -20dB to 0dB...
Page 4 DOEPFER Synthesizer Voice A-111-5 System A-100 Remarks: Additional specifications: • As the LFO frequencies can go up to moderate audio • Front panel width: 24 HP / 121.6 mm • range (~ 5kHz) even audio FM effects of VCO (pitch...
Page 5 DOEPFER System A-100 Synthesizer Voice A-111-5 2. Overview Fig. 2: Front Panel (full view)
Page 6 DOEPFER Synthesizer Voice A-111-5 System A-100 Fig. 2a: Front Panel (VCO and VCF) VCO Tune VCO Range Switch (Octave Switch) 3a VCO FM Source Switch 3b VCO FM Level VCO Waveshape Switch VCO Rectangle Pulsewidth 6a VCO Pulsewidth Modulation Source...
Page 7 DOEPFER System A-100 Synthesizer Voice A-111-5 Fig. 2b: Front Panel (VCA, LFO, ADSR) VCA Amplitude (Manual Gain) 13a VCA AM Source Switch 13b VCA AM Level 14a LFO1 Frequency 14b LFO1 Frequency Range Switch 14c LFO1 Waveform Switch 15a LFO2 Frequency...
Page 8 DOEPFER Synthesizer Voice A-111-5 System A-100 Fig. 2c: Frontpanel (Inputs and Outputs) VCO Frequency Control Input (1V/Octave) VCO Pulsewidth Control Input VCF Frequency Control Input (1V/Octave) VCA Amplification Control Input ADSR Gate Input VCF External Audio Input Inverted LFO1 Output...
Page 9 This input is used to control VCO frequency from the socket at the front panel. It works in addition to the control voltage that is applied to the CV line of the A-100 bus – provided VCF Frequency Control Input (1V/Octave) that the corresponding jumper JP2 is set (details in the appendix) –...
Page 10 Inverted LFO1 Output By default the inverted LFO1 signal is available at this socket. It can be used to control other A-100 modules or other inputs of the A-111-5 (e.g. controlling the PW or the VCF frequency by LFO1). The internal jumpers (JP7, JP8,...
Page 11 VCO Range Switch (Octave Switch) In addition to the internal FM controlled by 3a and 3b the VCO FM Source Switch control voltages applied to the A-100 bus CV line and to the VCO FM Level "VCO F" socket modulate the frequency of the VCO as described in chapter 3.
Page 12 DOEPFER Synthesizer Voice A-111-5 System A-100 Pay attention that the rectangle waveform can be turned off VCO Rectangle Pulsewidth also by means of the PWM. If for example the manual 6a VCO Pulsewidth Modulation Source control 5 can is set to position 2 or 8, LFO2 (triangle) is...
Page 13 A detailed 9a is used to select the XM source: description of different filter types can be found in the user manuals of the A-100 filter modules (e.g. A-120 or A-121). upper position: LFO2 = XM source...
Page 14 A detailed description of the resonance function can be found in the user manuals of the A-100 filter modules (e.g. A-120 or A-121). As the control scale of the VCF in the A-111-5 has a very precise 1V/Octave behaviour the filter can be "played"...
Page 15 DOEPFER System A-100 Synthesizer Voice A-111-5 VCA Amplitude (Manual Gain) Control 13b is used to adjust the intensity of the internal amplitude modulation. VCA AM Source Switch VCA AM Level In addition to the internally generated amplitude of the VCA the control voltage applied to the "VCA A"...
Page 16 DOEPFER Synthesizer Voice A-111-5 System A-100 14a LFO1 Frequency The LED next to the control 14a displays the present frequency and waveform. Positive shares of the signal are 14b LFO1 Frequency Range Switch indicated by green (or yellow) color, negative shares are 14c LFO1 Waveform Switch red.
Page 17 A more detailed description of the ADSR envelope can be one period of the VCO signal (e.g. a 200Hz VCO signal has found in the user manuals of other A-100 envelope a period of 2 ms, the shortest envelope time in the "high"...
Page 18 DOEPFER Synthesizer Voice A-111-5 System A-100 6. User Examples Basic position...
Page 19 Sustain and Release. To obtain a sound both a CV and a Gate signal is required. CV and Gate can be supplied via the A-100 bus or the sockets at the front panel (please refer to the jumper settings in the appendix if you want to control the module from the A-100 bus).
Page 20 DOEPFER Synthesizer Voice A-111-5 System A-100 Appendix: Position and function of the jumpers (JPx) and trimming potentiometers (Px) A-100 Bus...
Page 21 Connects the audio output to +5V line (!) of the A-100 bus not installed Can be used only for special applications and if the +5V line of the A-100 bus board is unused. Otherwised problems will occur. Relation VCO/ext. signal...
Page 22 DOEPFER Synthesizer Voice A-111-5 System A-100 Trimming Potentiometers Overview Name Function Explanation Factory default adjusted to 1.00V/octave VCO Scale adjusts the 1V/octave characteristics of the socket "VCO F" or the bus CV VCO Offset adjusts the VCO frequency offset 64 Hz @ center position of the VCO Tune...

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A-111-5