Erica Synths EDU DIY Dual VCA Eurorack Module Kit - Manual (Page 2)

THE VCA
The VCA is one of the fundamental building blocks of any modular synthesizer. No rack is
really complete without it – which is why I came up with this simple circuit for my own
modular system. It’s a fairly basic, yet super e
ffi cient little VCA made of just a couple
transistors and op amps. 2
Eagle-eyed readers might spot that some resistor values have changed compared to the version 2
I showed o ff in my VCA video. Unfortunately, explaining that was out of scope for this (already
super long) manual. But in e ff ect, those changes reduce the amount of noise on the output
and improve the linearity of the VCA’s CV response .
2