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

[Grant Richter]

Looks to me like the "off" adjustment for the FET electronic switch  
probably a trimmer.

Somewhere there should be a junction where the front panel control  
and the control line from the program card meet, that would go to  
terminal 1.

On Nov 23, 2008, at 3:35 PM, Aaron Lanterman wrote:

> 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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