[sdiy] Dual oscillator cores?

[Donald Tillman]

   > Date: Mon, 19 Oct 2009 20:24:27 -0700
   > From: "David G. Dixon" <dixon at interchange.ubc.ca>
   > 
   > Yes, I just tried it in simulation, and it really is that easy!
   > A 1k trimmer + 5.6k ground resistor with a 10k positive feedback
   > resistor on the schmitt trigger ensures perfect +/-5V triangles.
   > However, the high-frequency tracking appears to be even more of
   > an issue than with the saw-core VCO, so I don't really see an
   > advantage.  

A triangle core can switch ramp direction about an order of magnitude
faster than a sawtooth core can reset.  But you actually have to take
care and engineer the speed in.  (High speed comparators, low
switching voltages, high speed OTA's or analog switches, etc.)

(I mean, yeah, if use relays...)
         
  -- Don

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