[sdiy] very simple VCA circuit

[David G. Dixon]

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.