[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:

http://urekarm.tripod.com/synth/jx_vca.pdf

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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