[sdiy] Pitch-to-voltage converters

[James Elliott]

Keeping this discussion on the list would be highly appreciated, David. I'm an EE newbie and I've gained a lot of insight from your previous posts/discussions.

Thanks,
Jim



----- Original Message ----
From: David G. Dixon <dixon at interchange.ubc.ca>
To: Harry Bissell <harrybissell at wowway.com>
Cc: Synth DIY <Synth-diy at dropmix.xs4all.nl>
Sent: Thu, February 18, 2010 11:14:38 AM
Subject: RE: [sdiy] Pitch-to-voltage converters

> The EFM one was based on the Moog design "Etherwave PV converter" and only
> works if you
> have a good stable square wave. That is the tough part.
> 
> Also, it divides the input frequency in half so there is at lease 24ms
> latency on a low
> guitar E string.
> 
> I'm familiar with all the commercial units, we can talk :^)

Harry, for now I'm only interested in tracking a sawtooth wave from a
saw-core VCO, so your circuit should work swimmingly.  I don't even need the
trigger/gate stuff; just the F-V conversion part.  In fact, I don't even
need the antilog circuit, since I only want to use the voltage to change the
speed of LFOs in proportion to the sawtooth frequency (go ahead, guess what
I'm trying to "reverse engineer").  However, I may want to build a more
"general purpose" unit a bit later, and then we can talk.

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