[sdiy] How does the JX3P VCA work?

Gordon JC Pearce gordonjcp at gjcp.net
Wed Jan 15 11:32:04 CET 2014

I was looking at simple VCA circuits (I want popless muting for some communications gear, so a slightly ramped VCA would do but distortion isn't a big problem), and ran across this:


How exactly does it work?  I would have thought that increasing the CV would turn on both the pass transistor and the shunt transistor.  There's obviously something clever that I'm missing.

Gordonjcp MM0YEQ

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