No subject

[Todd Goodenow]

Ok so lets say you take a simple circuit design like
so
http://www.ecircuitcenter.com/Circuits/opsalkey1/opsalkey1.htm

basically a single op-amp low pass filter. Now since
the frequency of the filter is set by one of the
capacitors, is it possible to use a variable capacitor
for variable frequency? For resonance could one set up
a feedback loop with a potientiometer controlling
amount? I'm new to this stuff but trying to figure out
my way along. I want to build a simple filter just to
get started (i don't want a kit either, I took a good
physics course and want to understand this stuff from
the ground up).

thanks, todd

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