The
AVS-VCA-1
User Guide
Waveform Diagrams
Dual VCA
Calibration Trimpots
Your new AVS-VCA-1 Dual VCA was expertly calibrated by hand for
maximum transparency and dynamic range. Multiturn trimpots
are used for increased accuracy in calibration and can be turned
using a small
fl
at-head screwdriver or other suitable implement.
The Bias trimpots are used to adjust the level of DC o
ff
set created
by the module in the course of its operation. The module is
shipped with this set for minimum o
ff
set from ground, and
therefore maximum dynamic range. Increasing the amount of
bias applied in one direction will increase the amount of
asymmetrical distortion created, which may be desired in
certain applications.
The Init (Initial Position) trimpots are used to set the initial level
of gain or attenuation applied to the input signal. This is generally
set so that when the front panel gain knob is in the vertical position,
the CV input is zero, and the input signal is +/- 5v, the output
will be silent. As the CV input is increased, the output level
increases correspondingly.
Recalibrating this module requires the use of accurate multimeters,
oscilloscopes and signal generators. If you are not able to carry out
recalibration yourself, the engineers at AvonSynth will be happy to
recalibrate your module for you free of charge during the warranty period.
VCA 1 Bias
VCA 1 Init
VCA 2 Init
VCA 2 Bias
+10v
0v
-10v
0v
Linear Mode
Logarithmic Mode
Signal
Input
CV
Input
Output
+10v
-10v
0v
+10v
-10v
+10v
0v
-10v
0v
Signal
Input
CV
Input
Output
+10v
-10v
0v
+10v
-10v
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