[sdiy] Simple, single supply VCA

[Oren Leavitt]

Justin Owen wrote:
> Hello,
> 
> I'm back to tinkering with single transistor-based VCA's - with mixed results.
> 
> So I was wondering - if I was after a simple, single supply VCA schematic - nothing too fancy - but not bare-bones simple...
> 
> ...what would you all suggest?
> 
> Cheers - J.
> 

Justin,
The PAiA 2720 VCA (3 NPN trasistors and a 748 op amp) seems like a good 
one to play with.
It is designed for the Gnd(0V)/+9V/+18V power supply of the 2720, but 
can probably be easily adapted to a single power supply.

http://www.synthdiy.com/files/2004/PAIA_2720-1_VCA.gif

It's a step up from the simpler 2-transistor Korg MS20/Roland JX3P design.

- Oren