[sdiy] Simple, single supply VCA

[mark verbos]

The meeting point of the most expensive synth and the cheapest synth.  
The Paia 2700 VCA is very similar to the Buchla 110. It  transistors  
for the output output stage as well. The VCA in the 410 module cluster  
has an opamp output stage like the Paia, but it needs a -15 volt rail.

Mark




On Feb 3, 2010, at 4:03 PM, Oren Leavitt wrote:

>
>
> 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
> _______________________________________________
> Synth-diy mailing list
> Synth-diy at dropmix.xs4all.nl
> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy