[sdiy] very simple VCA circuit

[Harry Bissell]

The question is, how good of a VCA are you trying to make ?
Good cutoff ? Low distortion ? Low CV feedthrough ? Wide range ...?

I like the VCA from the PAiA2720 if you want to use a semi-discrete
design, ot why not the CA3080 of LM13600/700 ?  

OTA have reasonably low component count, good to very good performance.

H^) harry




----- Original Message -----
From: David G. Dixon <dixon at interchange.ubc.ca>
To: 'SDIY List' <synth-diy at dropmix.xs4all.nl>
Sent: Thu, 27 Jan 2011 02:50:37 -0500 (EST)
Subject: [sdiy] very simple VCA circuit

Hey Team,

I'm looking for a very simple voltage-controlled gain circuit that I can
build with, say, one BJT or JFET.  It only has to handle positive voltages,
and the gain range will be confined to 0 to 2.

I've tried simulating some JFET circuits from the web on Multisim, but have
had no luck.  Any link to a schematic for a tried and tested circuit would
be most appreciated, preferably one you've tried yourself.

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-- 
Harry Bissell & Nora Abdullah 4eva