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Doepfer

Index last updated: 2026-04-29 00:15 UTC

Message

Re: Noisy A-131 VCA >> opamps

2004-02-06 by Tim Stinchcombe

> thank you very much for the info. Where did you get it? Service 
manual I 
> suppose. Seems there´s lots of info on the electronics and how to 
modify 
> them. Man, I´d definitely buy it if it wasn´t so expensive... so fa

Nope. Just from tracing out the circuit. The first few take a while, 
but after a bit of practice you can get quite efficient at it! I'd 
buy the service manual if it were on CD, so that I could 'babelfish' 
selected parts. But for obvious reasons its unlikely Doepfer would 
produce it electronically.

> Since I am a newbie to synth-DIY it would be very cool if Doepfer 
could 
> provide us with a schematic of the "mythical expansion ´board2´". I 
got 
> to mod the A-131. Two VCAs for the price of one (plus a little of 
cost 
> for the electronics) :-)
> Still begging for the DIY pages on Doepfer´s website...

This would be a very good candidate for the DIY pages. Unfortunately 
its clear that the Doepfer folk are going full tilt developing new 
modules at the moment, so there is no time for the DIY web pages I 
guess.

Tim

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