[sdiy] Buchla 291e teardown

David G Dixon dixon at mail.ubc.ca
Mon Dec 26 19:31:20 CET 2022

Yep, I only use 2164 in all my filter designs.  I built one filter with
13700 when I got started with electronics, and it was great, but the 2164 is
just so convenient and works so well.
It also makes great VCAs, VCOs, multipliers, crossfaders, linear FM and
through-zero FM drivers, frequency shifters, and was even at the heart of
the original Quadra, which was functionally identical to the Buchla 281.


From: Synth-diy [mailto:synth-diy-bounces at synth-diy.org] On Behalf Of Darren
Shorsky via Synth-diy
Sent: Monday, December 26, 2022 10:03 AM
To: synth-diy mailing list; Lanterman, Aaron D
Subject: Re: [sdiy] Buchla 291e teardown

[CAUTION: Non-UBC Email]	
If it uses the 2164..... it may be similar to any one of the filters that
Dave Dixon has built over the years.
The 2164 being his go to chip for almost everything.....  he also doesn't
use vactrols as far as I'm aware.
Perhaps he'll come by and shed some light. fwiw.



From: Synth-diy <synth-diy-bounces at synth-diy.org> on behalf of Lanterman,
Aaron D via Synth-diy <synth-diy at synth-diy.org>
Sent: December 26, 2022 9:51 AM
To: synth-diy mailing list <synth-diy at synth-diy.org>
Subject: [sdiy] Buchla 291e teardown 
I've always wondered if the 291e uses Vactrols like the original 291. It
doesn't! It's completely different. It uses SSM2164 VCAs, so I'm guessing
it's probably closer to the State Variable Filter in the Oberheim OB-MX. 

Here's a video of me taking it apart, looking at the PCBs, and putting it
back together: 


Aaron Lanterman, Prof. of ECE, Georgia Tech
My blog on Education and Innovation: https://edupocalypsenow.wordpress.com
My blog on Electronics and Programming: https://lantertronics.blogspot.com
My YouTube channel on Electronics and Programming:

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