Don't laugh out loud but:
When hand picking crystals for a filter network, can you do it by ear?
That is to say, can you plug them into an oscillator circuit and
listen on a receiver for the ones closest in tone? Or are you looking
for much more precision?
How close should they be to each other? What can I expect?
What if I just use four from the same batch? If they are off a little
how much will it affect the final result?
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