[sdiy] 100K pot in Music Easel timbre section, and board setup

Aaron Lanterman lanterma at ece.gatech.edu
Tue Sep 23 22:35:08 CEST 2008


Hello keepers of the knowledge of Buchla:

1) If you look here, you'll find the "timbre" generating circuitry of  
the Music Easel:

http://rubidium.dyndns.org/~magnus/synths/companies/buchla/Buchla_2080_9_200.jpg

In the lower part of the schematic, there's a 100K pot, which runs  
from the collector of Q5 go ground, with the wiper going to the gate  
of Q6 through a 10K resistor.

Is this pot on the front panel, or is it a trim pot of some sort on  
the circuit board?

2) If you look here, you'll find a set of diagrams describing how the  
various boards connect to each other:

http://rubidium.dyndns.org/~magnus/synths/companies/buchla/Buchla_2080_13A_200.jpg
http://rubidium.dyndns.org/~magnus/synths/companies/buchla/Buchla_2080_13B_200.jpg
http://rubidium.dyndns.org/~magnus/synths/companies/buchla/Buchla_2080_14A_200.jpg
http://rubidium.dyndns.org/~magnus/synths/companies/buchla/Buchla_2080_14B_200.jpg

Is there a "master key" of what the various S1 and S2 marking along  
the top and bottom of the pages correspond to? I'm sure with a lot of  
detective work I could puzzle it out - I was just wondering if there  
was a known list somewhere.

- Aaron



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