[sdiy] pitch to voltage

[harry]

Just for the record the
PV-1 is "based on the Etherwave Pitch to Voltage converter by Bob Moog, used
with permission".   Bob was nice enough to sanction me making PCBs for our
DIY community.

I did modify the circuit, the gate is done differently, and I changed the order of'

the states of the conversion, so that an external reset would put the unit in hold
mode, rather than reset.

The circuit is not new, the 360 systems slavedriver had the same method. But
since Bob Moog had the circuit on paper already, why re-invent the wheel ?

I use it all the time on Theremin  (along with a Wiard Mini-Wave as a quantizer).
People have also used it to convert continuous waves (perhaps from a V/Hz
oscillator) into V/oct output.

I have plugged a guitar into it... you will not like it unless you like lo-fi... in
which
case you might love it !!!

H^) harry

Scott Bernardi wrote:

> There are two main difficulties with doing pitch to voltage on "natural"
> instruments. One is isolating the fundamental. Instruments like guitars have a
> lot of extra harmonics that the P2V converter can get confused by.
> The second is delay.  It takes a minimum of 2 cycles to determine pitch, so at
> low frequencies (like bass guitar) this becomes even more of a problem.
> Circuits that help isolate the fundamental also tend to increase delay.
>
> That said, EFM (http://www.ele4music.com/) offers the PV1 board (designed by
> Harry Bissell) for $14. This assumes you've already got a nice squarewave going
> in.  I got one recently, but haven't built it yet.
> Harry, maybe you can comment on the p2v problem?
>
> Nick Liebrecht wrote:
>
> > I am planning to create a semi-modular synthesizer for use with the electric
> > bass guitar.  I know that i will need an envelope follower, preamp, and
> > pitch to voltage converter.  I had no problem with the first two modules,
> > but the third has me stumped.  Could anyone point me towards some info on
> > pitch to voltagge conversion?  I'm looking for schematics and theory.
> >
> > Thanks,
> > Nick Liebrecht
>
> --
> Scott Bernardi
> sbernardi at home.net

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