[sdiy] VCO reset time

[Don Tillman]

   > Date: Fri, 04 Jun 2004 10:42:45 +0200 (CEST)
   > From: Magnus Danielson <cfmd at bredband.net>
   > 
   > From: Don Tillman <don at till.com>
   > Date: 03 Jun 2004 22:24:36 -0700
   >
   > >      triangle -> saw
   > > 	             -> square
   > > 	             -> sine
   >
   > Actually, with a triangle core you get the square waveform for
   > free, since you need the square waveform to change the
   > charge-direction, so that state is there.

That's true.  I wrote it that way because I was thinking of a square
wave with PWM.  For that you need to derive the square wave.

   > The triangle together with it's squarewave makes it easy to do
   > the sawtooth.  If you try to generate a squarewave from the
   > triangle such that it is suitable to aid in the sawtooth
   > generation, then you got yourself into much greater trouble than
   > you might first think.

Certainly.

   > 4. A Pulse-Width Modulated output based on triangle does not have
   > the phase- modulation that a sawtooth based variant has. This may
   > or may not be a good thing depending on what you are after.

True.  One is more useful for an audio VCO, the other is more useful
for an LFO.  Typically.

  -- Don

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