DOEPFER A-100 Series Manual
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Also See for A-100 Series:
- Owner's manual (690 pages) ,
- Manual (22 pages) ,
- User manual (12 pages)
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doepfer
Level
Audio
In
FCV 1
FCV 2
FCV 2
QCV
QCV
Audio
Out
System A - 100
A-123
VCF 4
Frequency
Resonance
Module A-123 (VCF 4) is a voltage-controlled high-
pass filter, which filters out the lower parts of the
sound spectrum, and lets higher frequencies pass
through.
The cut-off frequency determines the point at which
filtering takes effect. You can control this manually, or
by voltage control (filter modulation, for instance by
an LFO). Two CV inputs are available.
The cut-off slope is -24 dB/octave. The circuitry uses
a Curtis CEM 3320 chip.
Voltage controlled resonance: on the VCF 4, reso-
nance can be controlled not just manually, but by
voltages as well, right up to self-oscillation. In this
case, the filter behaves like a sine wave oscillator.
A-123
VCF 4
1. Introduction
1
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Summary of Contents for DOEPFER A-100 Series
- Page 1 System A - 100 A-123 doepfer VCF 4 1. Introduction Module A-123 (VCF 4) is a voltage-controlled high- Level pass filter, which filters out the lower parts of the A-123 Audio sound spectrum, and lets higher frequencies pass VCF 4 through.
- Page 2 A-123 System A - 100 doepfer VCF 4 Controls: 2. VCF 4 - Overview 1 Lev. : Attenuator for audio input ! A-123 VCF 4 2 Frq. : Cut-off frequency control 24 dB High Pass 3 FCV : Attenuator for filter CV at input §...
- Page 3 System A - 100 A-123 doepfer VCF 4 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 4 A-123 System A - 100 doepfer VCF 4 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.
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Page 5: Audio Out
System A - 100 A-123 doepfer VCF 4 $ QCV 5. User examples This socket is the voltage control input for the filter’s The filter’s cut-off frequency can be modulated in resonance. various ways: If you patch a modulation source (eg LFO, ADSR) to •... - Page 6 A-123 System A - 100 doepfer VCF 4 For this patch, set both f (L ow Pass A-122) and f 24 dB notch filter with voltage control of (H igh Pass A-123) to roughly equal cut-off points middle frequency and bandwidth (judging by ear).
- Page 7 System A - 100 A-123 doepfer VCF 4 To create a 24 dB bandpass filter with voltage-controlled middle frequency and bandwidth, put both filters in series (see the A-122 user examples). For voltage control of middle frequency and bandwidth, follow the relevant notch filter instructions.
- Page 8 A-123 System A - 100 doepfer VCF 4 6. Patch-Sheet The following diagrams of the module can help A-123 A-123 A-123 VCF 4 VCF 4 VCF 4 you recall your own Patches. They’re designed so 24 dB High Pass 24 dB High Pass 24 dB High Pass that a complete 19”...
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