1/X circuit

[Don Tillman]

   From: "Tony Allgood" <oakley at techrepairs.freeserve.co.uk>
   Date: Thu, 27 Jan 2000 10:39:22 -0000

   > Voltage controlled symmetry... I think 1/x is not a good way,
   > because of exessive error.
   > Don Tillman came up with a good idea how to do this via
   > exponential functions. Recommended..

   Don are you there... I missed this one. Is it on the archive yet?

Zzzzz, hello, what?  

Oh yes, I've always been intrigued by voltage controlled symmetry, and
it's a really tough problem because, for a musical VCO, you really
don't want the pitch to change at all.  Knob controlled symmetry is
easy, voltage controlled symmetry is tough.

There was a discussion here last summer and it me thinking about the
problem again.  I came up with a circuit for taking an already
existing sawtooth wave and warping the waveshape, thus guaranteeing
that the pitch won't change.

  http://www.till.com/articles/VariableSaw

Completely untested.  (Some day I'll build this up.)

  -- Don