[sdiy] Resistor matching in Bergfotron complex VCO

[Donald Tillman]

   > From: Aaron Lanterman <lanterma at ece.gatech.edu>
   > Date: Sun, 27 Apr 2008 04:57:47 -0400
   > 
   > One of my students, Greg, is working on building the Bergfotron
   > version of the Buchla 259 triangle core.

Hey Aaron,

He'll need a large stock of colorful inks to do that!   :-)

   > At higher frequencies, it looks pretty triangular, but at low
   > frequencies it's more like a 20% triangle. (Also, when twisting
   > various knobs to get the lowest frequency, it seems to only get
   > down to 600 Hz, but I suspect that will be fixed once we get the
   > triangle more triangular.)

Hey, at high frequencies *everything* looks triangluar.  :-)

A slight resistor mismatch wouldn't cause that; I strongly suspect a
wiring error.

  -- Don

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