[sdiy] Quad VCA Chips ( was quite erroniously Quad Op-Amp Chips!!!)

[mark verbos]

Aaron,

I really doubt that Buchla added those SSM chips to the OBMX. From what 
I understand he was required to work with the parts they had and 
besically re-design the existing synth that the previous engineers 
couldn't get to work properly.

Mark




Aaron Lanterman wrote:
> 
> On Wed, 17 May 2006, mark verbos wrote:
> 
>> The Buchla 291e uses these. I was surprised to see them when I look 
>> inside.....
> 
> 
> Hmmm... I'm actually not too surprised. Buchla was involved in the 
> ill-fated OB-Mx project, and it uses SSM2024s (predecessor to the 2164, 
> although definitely not a drop-in replacement) all over the place, 
> notably the state variable filter.
> 
> The OB-Mx does use vactrols in the panning section, though...
> 
> See http://users.ece.gatech.edu/~lanterma/obmx for schematics.
> 
> 
> - Aaron
>