Quote:
Originally Posted by Kamakiri
If an .008 uF capacitance difference locks in the circuit, I'm somehow good with that. Probably even less, considering a normal 20% tolerance.
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While I fully understand the desire to follow the schematic "to the letter" , I understand there ARE times when this just isn't possible . Several times I have run into resonant circuits that work better with more (or less) capacitance than the circuit calls for . I had always attributed this to slight differences in components like the coils , which may themselves be slightly off of their designed tolerances .
Say for instance , your peaking coil that was supposed to be wound with 1000 turns accidentally left the factory with 950 turns instead . The capacitance required to get this particular coil to resonate at the desired frequency would certainly be different than that needed for the proper 1000 turn coil , and thus will never perfectly coincide with what the schematic calls for . It's instances like these where ya gotta give the circuit what it wants , rather than rigidly adhering to a schematic value that produces un acceptable results .
This is where a capacitor substitution box that has like 10 switchable values can aid greatly in the experimentation of finding the best fit for that particular circuit .