[sdiy] Buchla 291e teardown

[Darren Shorsky]

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.

d.
________________________________
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:

https://www.youtube.com/watch?v=-ndWT1LWqJ8

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: https://www.youtube.com/c/lantertronics



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