Dual VCA

CEM3360-based dual VCA

You can never have enough VCAs, a common meme in modular synthesis declares. While this module certainly cannot fill that infinite gap, it does add two handy voltage controlled amplifiers to your setup.

These linear, DC coupled VCAs are suitable for both audio and CV processing. The control inputs have dedicated attenuators, and each VCA can be manually opened with the Bias control.

Finally, the module has a built-in mixer, summing the output of both VCAs and one auxiliary input into the Sum Out jack. This way, for example, multiple units can be daisy-chained to form a multichannel voltage controlled mixer.

The DIY module is built around the AS3360 dual VCA chip, a clone of the CEM3360 (the latter should also work in this module, but has not been tested). Except for the AS3360 itself (which is in a PDIP package), the board uses 0805 SMD parts and SOIC opamps.

https://kassu2000.blogspot.com/2019/03/dual-vca.html