[sdiy] all analog FM synthesis?

[Don Tillman]

   > From: "Paul Maddox" <P.Maddox at signal.QinetiQ.com>
   > Date: Fri, 18 Feb 2005 11:48:30 -0000
   > 
   > > i have been very much into FM synthesis lately and i was
   > > womdering if it can be done analog? what i have looked at is a
   > > design for a quad triangle VCO. with lin and log inputs. and
   > > one have a though on this ?
   > 
   > this has been discussed on here before (can't remember when), I
   > think someone was going to have a go at building some. The big
   > issue, IIRC, is the 'reversing' of the output wave when the input
   > CV goes negative.

Jeeze guys, I've only posted it about eight times or so...  :-)

  A Quadrature Trapezoid Voltage Controlled Oscillator
  http://www.till.com/articles/QuadTrapVCO

  -- Don

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