[sdiy] Simple, single supply VCA

[Oren Leavitt]

Yes - very similar, and uses a single 15 volt supply.
 From Magnus' site:
http://rubidium.dyndns.org/~magnus/synths/companies/buchla/Buchla_1100_1_200.jpg

- Oren (imagining a VCA module in 60's styling with "7 transistors" 
labeled on it)

mark verbos wrote:
> 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
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> 
> 
>