[sdiy] Pitch-to-voltage converters

[David G. Dixon]

> 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.