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Measuring low AC voltages with Arduino or ESP32

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Jordan1

New Member
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.
 

Pommie

Well-Known Member
Most Helpful Member
Use an opamp to amplify it. BTW, 25.000 is the same as 25 here. Do you mean 25kHz?

Mike.
 

juam_r

New Member
Here are some very low noise opamps: MAX4475 or LMV771. The LT1167 instrumental amplifier may be useful and simpler to configure.
 

Jordan1

New Member
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 :'(
 

Jordan1

New Member
Yet. even connecting these amplifiers - how would be the actual measurement occur, since the voltage is high frequency ?
 

Nigel Goodwin

Super Moderator
Most Helpful Member
Yet. even connecting these amplifiers - how would be the actual measurement occur, since the voltage is high frequency ?
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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