[sdiy] spiral waves (sort of)

[Don Tillman]

   > From: "john mahoney" <jmahoney at gate.net>
   > Date: Sun, 5 Jun 2005 00:23:11 -0400
   > 
   > > Hmmm... you want one of Don Tillman's Trapezoid VCOs...   :^P
   > >
   > > That could give you all the standard waves in quadrature
   > 
   > Well... Last time I had checked, Don was not completed with it.

The QuadTrap VCO itself was complete when I first published it.  I
haven't written up the waveform generator circuit (but that's
completely straightforward) and I haven't written up the deluxe
version with phase modulation.

   > And, I don't have any 3280s -- upon which it is based, as I
   > recall -- so, I am SOL.

CA3280's are still very easy to get.  

  -- Don

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