[sdiy] What is a quadrature oscillator good for?

[Don Tillman]

   > Date: 15 Sep 2003 13:27:12 -0700
   > From: Don Tillman <don at till.com>
   > 
   >    > From: "jhaible" <jhaible at debitel.net>
   >    > Date: Mon, 15 Sep 2003 02:35:23 +0200
   >    > 
   >    > But won't you have problems with leakage here, even with the
   >    > trapezoid core?
   > 
   > It hasn't been a problem.  For any given quarter cycle, one of
   > the capacitors is just held at a reference voltage and the other
   > gets to travel between the two reference voltages.  If the
   > travelling capacitor is off by a little bit due to leakage, opamp
   > offset, or whatever, that's just a question of trimming the 0 Hz
   > point.

Ooops, sorry, you mean leakage in the form of a resistance.

Sure, that shows up as if the rotating object had a very slight
amount of spring to cause it to drift to certain position.

The effect is very slight.  I haven't seen it actually happen,
though I'm sure it does.  

  -- Don

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