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I wouldn't want to connect an op-amp to a resonating crystal circuit, but this should work just fine.
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Huh? By resonating crystal circuit I believe you mean the transistor. I'm interested in what you are saying here, could you elaborate for me please.
I found 10 turn wirewound rheostat for $8.10 at
Mouser Electronics here. This is the cheapest I could find them. If anyone can suggest something better or less expensive(assuming its not crap), fell free to mention it. Looks like I'll have to incorporate a LED into my pwm too.
