[sdiy] Simple VCA?

[Magnus Danielson]

From: Aaron Lanterman <lanterma at ece.gatech.edu>
Subject: Re: [sdiy] Simple VCA?
Date: Sun, 13 Apr 2008 17:55:42 -0400
Message-ID: <68CBCE44-8479-4240-917C-2CFA55E69521 at ece.gatech.edu>

> 
> On Apr 13, 2008, at 5:33 PM, Magnus Danielson wrote:
> 
> > You guys should check out the EMS Synthi-A schematics. There is a bunch of
> > these in there... including the Filter Q feedback system. :)
> 
> We'd love to, if we could find them...

I assumed that this page was on your radar screen, as it has been on mine for
many long years.
http://www.hinton-instruments.co.uk/ems/emsmods.html

You want to check the Output amplifiers and the Envelope generators. Those are
the "visible" 3 VCAs in that design.

> People usual don't post schematics "out of deference to EMS..." but their
> website hasn't been updated in _10 years_, which makes it hard for me to take
> them seriously as viable synth-manufacturing entity.

Well, as long as the phone number and email address is correct and their
customers find them and is happy about the service, let's cool it. To the best
of my knowledge they do provide the support and service. New machines, it looks
a bit less clear. The important stuff is there.

> (Of course, STS doesn't even have a website, which makes me take them even less seriously).

STS delivers. A friend of mine recently received a nice panel and I sure
enjoyed patching it.

Cheers,
Magnus