Doepfer A-135 VC User Manual
doepfer
System A - 100
1. Introduction
VC-Mixer
A-135
CV 1
CV 2
CV 3
CV 4
ext. CV
1
VC-Mixer
Gain 1
2
Gain 2
3
Gain 3
4
Gain 4
A-135
Audio In
Audio Out
Module A-135 (VC-Mixer) is a four-channel voltage
controlled mixer
, which is used to mix audio signals
with four independent voltage controlled levels.
The module consists of 4 linear voltage controlled
Audio In 1
1
Audio In 2
2
Audio In 3
3
Audio In 4
4
amplifiers (VCAs) mixed to one common output. High
quality integrated VCAs (CEM3381) are used in the
circuit.
Each VCA has the following:
• Audio input with attenuator
• Control voltage input with attenuator
• Gain control (amplification offset).
1
A-135
VC-Mixer
System A - 100
doepfer
2. VC-Mix - Overview
A-135 VCMIX
VOLTAGE CONTROLLED MIXER
Audi o In ext. CVGain
10
0
10
0
10
0
10
0
Audio Out
Controls:
Audio In : Attenuator for audio si-
1
gnal at input !
2
1
10
0
10
0
2
10
0
10
0
3 ext. CV : Attenuator for control
In / Outputs:
! Audio In : Audio input
3
10
0
10
0
"
§ CV 2 : Control voltage input
4
10
0
10
0
: Control for amplification
Gain
offset
voltage at input
Audio Out
: Audio output (mixed out-
put of the four VCAs)
§
➀
➁
➂
2
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