Corsynth C108 Dual VCA User manual

USER MANUAL
C108 Dual VCA
C108
DUAL VCA
CV 1 IN
VCA 1 OUT
CV 2 IN
VCA 2 OUT
GAIN
0 1
CV LEVEL
MAXMIN
LIN
EXP
GAIN
0 1
CV LEVEL
MAXMIN
LIN
EXP
VCA 1 IN
VCA 2 IN

C108 Dual VCA
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The C108 Dual VCA is a dual voltage controlled amplier with
selectable linear and exponential response.
VCAs are one of the most important modules in a modular
synth. In addition to the more obvious use , that it’s volume
control, a VCA allows to add voltage control to any modulation
input helping to create more interesting and time evolving
patches.
Each VCA features :
- A signal input.
- An initial gain control.
- A voltage control input with a level potentiometer.
- A switch to select the VCA response, linear or exponential.
- An output.
The VCAs in this module are not only attenuators, they can
also boost the input signal. Using the initial gain
potentiometer and a ve volts CV signal, the VCA has a
maximum gain of 2 (doubles the signal amplitude). This is very
useful for signal processing or to boost external signals.
C108 Dual VCA
C108
DUAL VCA
CV 1 IN
VCA 1 OUT
CV 2 IN
VCA 2 OUT
GAIN
0 1
CV LEVEL
MAXMIN
LIN
EXP
GAIN
0 1
CV LEVEL
MAXMIN
LIN
EXP
VCA 1 IN
VCA 2 IN

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C108
DUAL VCA
CV 1 IN
VCA 1 OUT
CV 2 IN
VCA 2 OUT
GAIN
0 1
CV LEVEL
MAXMIN
LIN
EXP
GAIN
0 1
CV LEVEL
MAXMIN
LIN
EXP
VCA 1 IN
VCA 2 IN
C108 Dual VCA
Control voltage
input (VCA 1)
Signal input
(VCA 1)
Control voltage
level (VCA 1)
Initial gain
(VCA 1)
Out (VCA 1)
Control voltage
level (VCA 2)
Control voltage
input (VCA 2)
Signal input
(VCA 2)
Out (VCA 2)
Response selector switch
Linear / Exponential (VCA 2)
Response selector switch
Linear / Exponential (VCA 1)
Initial gain
(VCA 2)

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CONTROL DESCRIPTION
GAIN
This potentiometer sets the initial gain of the VCA. If
there is not CV signal connected to the VCA :
0 = The VCA is closed and there is no signal at the output.
1 = The output signal has the same level as the input.
CV LEVEL
This potentiometer sets the amount of CV signal .The VCA
total gain is the result of adding the CV signal and the
initial gain set by the GAIN potentiometer.
Using a 5V CV signal :
- GAIN at 0 = VCA gain is 1
- GAIN at 1 = VCA gain is 2 (
doubles the signal amplitude )
GAIN
0 1
VCA RESPONSE SELECTOR SWITCH
This switch sets the VCA response :
- LIN : the VCA has a linear response.
- EXP : the VCA has an exponential response.
THESE CONTROLS ARE THE SAME FOR VCA 1AND VCA2
VCA 1 IN
VCA 1 signal input. This input can be used with audio and
control signals.
CV LEVEL
MAXMIN
LIN
EXP
VCA 1 IN
CV 1 IN
Control voltage input for the VCA 1 gain. The amount of
CV signal is set by the CV LEVEL potentiometer.
CV 1 IN

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VCA 2 IN
VCA 2 signal input. This input can be used with audio and
control signals.
VCA 2 IN
CV 1 IN
Control voltage input for the VCA 2 gain. The amount of
CV signal is set by the CV LEVEL potentiometer.
CV 2 IN
VCA 1 OUT
VCA 1 output.
VCA 1 OUT
VCA 2 OUT
VCA 2 output.
VCA 2 OUT

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Trimmers and power connectors
Module Format : 5U, MU format ( Synthesizers.com, Moog )
Module Width : 1 MU ( Moog unit )
Module Depth :52 mm ( 2,05 inches )
Power : +15V@32mA , -15V@35mA
Power connectors : Synthesizers.com , MOTM ( 4 pin )
VCA maximum gain : without using CV maximum gain 1 , using CV maximum gain 2
TECHNICAL DATA
+15V+5V-15VN/C GND
Synthesizers.com
GND +15V-15V GND
MOTM
IMPORTANT !!!!
This module has two power connec-
tors (Synthesizers.com and MOTM).
Only one is needed to power the
module. (Synthesizers.com or MOTM).
Never connect both at the
same time.
Synthesizers.com
power connector
MOTM
power connector
CV Reject (VCA 1)
Initial Gain (VCA 1)
Exponential gain
(VCA 1)
Initial Gain (VCA 2)
CV Reject (VCA 2)
Exponential gain
(VCA 2)

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MODULAR LEVEL
MIN MAX
MODULAR SYNTHS