VCA 1 and VCA 2 can be used in conjunction with the ADSR module for dynamic control of signal amplitude, and also for periodic amplitude modulation of the signal waveform (tremolo).

This module uses the CA3080 as the voltage controlled gain device, driven using a trick originated by Walter Jung and documented in Electronotes. It has a linear control voltage/amplitude response.

The unit has the following features:-

• Linear voltage control/amplitude response
• Control inputs (3)
• Signal inputs (2 - 1x +ve and 1x -ve)