[sdiy] classic vco designs?

[Magnus Danielson]

Dan Snazelle wrote:
> 
> OK
> 
> after watching many of Aaron's lectures, i am starting to enjoy looking at and trying to understand parts of, old schematics. he has even made the buchla schematics make a little more sense!
> 
> my question is this
> 
> what are some of the most important designs to look at and really force myself to spend some time with?
> 
> moog 921?
> buchla 259?
> 
> earlier? later? more obscure companies that i might not know about?
> i notice the moog schematics are a jumble of transistors...can i learn much from those? what about ARP or roland or yamaha? what are some classic designs from those companies that might teach me some things? and i have the early electronotes now so i can contrast and compare. (ens73/74/76)
> 
> 
> obviously much of what i see when i look at these schematics goes right over my head. but i am starting to understand things like integrators, buffers, OTA's, comparators, summers, etc. i think this would be good homework for me (and maybe for others)
> 
> 
> so any have any assignments for me?
> 
> 
> thanks so much

I think you should start out with the ASM-1 schematics. They should be 
pretty straight forward, but provide you with enought food for thought 
to start with. Once you start to feel comfortable with those, learn to 
expand from that. Compare with the SEM, look at the late MiniMoog 
schematic etc. Build your knowledge base up. Dwelling into the innars of 
Buchla schematics is interesting, but maybe a bit dawnting to start with.

The Moog ladder and similar devices is a specific threshold to overcome.

Cheers,
Magnus