VCA for LFO

[jorgen.bergfors at idg.se]

Check my web site http://www.idg.se/personal/bergfors/bergfotron/index.htm. There you'll find many different VCAs that are all measured for CV bleedthrough (among other things).

/Jorgen





MIME:mike at eadinc.com on 99-05-17 09:23:25
To:  synth-diy at mailhost.bpa.nl @ SMTP cc:  (bcc: Jorgen Bergfors/IDGSE)
Subject: VCA for LFO 

I hate to interrupt the computer discussions, but...

I've got a couple of different LFO's happening now, and my first "packaged"
project is to be a LFO/VCA module to run alongside my PAIA midi/cv converter.

I've seen a lot of designs on the web, but most are pretty much devoid of
specs.

What basic design(type) has the lowest CV leakage? In this particular
instance, that would seem to be the most important criteria, as noise would
have to get pretty horrid to cause any substantial problems, and distortion
(for my purposes) is rarely if ever a problem. But if the center frequency
of the VCO starts moving with mod amount, it's a bummer.

I *am* working on the assumption that I want a linear VCA for this function
(just want to be able to translate mod wheel info to my minimoogs).  Am I
wrong in this?

Thanks for your input.

mwm