[sdiy] VCO reset time

[Don Tillman]

   > Date: Fri, 4 Jun 2004 09:37:40 -0400 (EDT)
   > From: Tony Clark <clark at andrews.edu>
   > 
   > Before settling on a sawtooth core years ago, I had played around
   > with triangle cores, but I found that I had a problem with the
   > waveshaping aspect.  The tri-to-saw conversion is not good in
   > that, in typical circuits, the wave is at double frequency to the
   > triangle wave.

Double frequency?  Heh-heh.

   > However, if you use a bit more circuitry you can achieve a
   > corrected frequency sawtooth, but the waveform is glitchy and
   > unsuitable for LFO applications.

There are ways to do it without glitches.  Buchla's VCO for instance. 

The triangle-to-saw and saw-to-triangle converters are actually very
similar at some basic level -- they both switch between inverted and
noninverted versions of the original waveform with offsets.

  -- Don

-- 
Don Tillman
Palo Alto, California
don at till.com
http://www.till.com