This question made me wonder. Say I want to drive a LED when a small level audio signal is present. I understand how to do this with an opamp, but how about a transistor. You'd have to bias it so that it just doesn't conduct without the signal, so that any extra voltage on the base will cause collector current to flow, right? Can anybody please explain how you do that: bias the transistor so that it just doesn't conduct, independent of temperature variations and such? Or is this the wrong approach?
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