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Hello.
I am looking for a way to measure AC voltage with frequency from 100 to about 25.000 Hz which is in the range from about 10 mV to about 80 mV which comes from a small coil.
Any suggestion will be appreciated.
Use an opamp to amplify the signal, then an active rectifier to generate a DC voltage that represents the AC voltage - essentially you're making an AC millivoltmeter.
Great. Thank You guys. Btw. Is there some ready schematic of some of these amplifiers which I can follow in order not to mess up the things ?
Btw. seems like none of these is available around :'(
As I said in post #3, you use an active rectifier to make it DC, exactly like an ac millivoltmeter (which is what you're building, just using an Arduino as the display) - here's one example you could utilise:
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