Capacitor reset with FET/analogue switch
don at till.com
Sat Mar 16 20:49:04 CET 1996
Date: Sat, 16 Mar 1996 16:39:12 +0100
From: Rick Jansen <rick at sara.nl>
In sawtooth VCO designs usually a capacitor is charged
with a current, and reset with an analogue switch of
some kind (an old discussion ;-).
Name one. (I'm serious; I don't know of any actual proven designs of
full audio range sawtooth VCOs that use an analog switch to discharge
Typically a single bipolar transistor, which is very well suited to
this sort of thing, is used. A powerFET would be even better.
I still haven't figured out all the ins and outs of the
reset process, particularly wether a FET or MOS-switch
in the form of a HC4066 ic is suitable or not. Theoretically
ir is not.
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