[sdiy] Buchla Model 148 Harmonic Generator

[Tim Daugard]

From: "Oakley Sound" <tonyallgood at btinternet.com>

> > f, 2f, 3f, 4f, 5f, 6f, 7f, 8f, 9f, 10f
>  > Does this module actually do this?
>
> Yes. And its mostly done by waveshaping.
>
> Full wave rectifiers give you the doubling, and the rest is bizarre
> combinations of diodes and clipping circuits. Clever.

I can figure out how to get 2f, 4f, and 8f  with no problem. I suspect that 3f can be
mostly made with f clipped to be square and the subtract f from the squarewave. 6f is 3f
doubled. 9f is 3f through a second tripler.

That leaves the ones I can't figure out - 5f and 7f. These could be pulled out with a
filter, but then you need the filter to track the input (or onboard) f.

Tim Daugard
AG4GZ 30.4078N 86.6227W Alt: 12 feet above MSL
http://home.sprintmail.com/~daugard/synth.htm
http://home.earthlink.net/~synthfred/h_toctop.htm (Fred's online edition)