[sdiy] Polyfusion LFO with voltage controlled start point

[mark verbos]

Hi!

I just finished the Polyfusion 2003 LFO circuitboard I bought from Bruce
Duncan 3 years ago. It is cool because it has a control for the start
time. So when you send a trigger to synch it it will reset to the part
of the cycle that you set the start time control to. Since Bruce didn't
think it was important to throw in a schematic I strted to wonder. Does
anyone know what is actually happening in there?  I would love to see
the schematic. I have tried to reverse engineer it, but just seeing the
real thing would be much nicer.

It is cool as both an LFO and an actual oscillator, a totally different
kind of modulation (sweeping the start time while the oscillator is
slaved I mean). Maybe if it used a matched transistor pair and a tempco
it would be a contender for the coolest oscillator award. I guess the
Buchlas still hold the tittle.

--
mark verbos

"if you want something done right, build it yourself."

verbos at simple-answer.com
www.simple-answer.com

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