[sdiy] Buchla schematics in general

[Grant Richter]

On many 200 series modules (if not most) there is additional  
circuitry added to the PCB board that is not shown on the schematic.

"Bug fixes" like this are common in short run manufacturing.

Sometimes resistor values changed, stuff like that.

Don is as better than most professionals at back annotating this kind  
of stuff.

Make sure you look over the whole schematic sheet for notes like: R14  
 > 68K DB 8/72

Spelled out that means "R14 was increased to 68K by Don Buchla in  
August of 1972"

Sometimes there is a little note with a reason, like "fixes problem  
SFC".

Which means somebody at the San Francisco Conservatory noticed  
something.

Many times the notes are on the drawing margins which may have been  
cropped when scanned.

It is a paper database, you know from before the things with keyboards.

It is remarkably complete and well maintained compared to most  
industrial messes from that era.