Non-inverting op amp (Battery Powered)

Hey guys,

So pretty much I have a ~4.5V power supply from 3 AA batteries, that I want to power an op amp (LM358P).

The reason I'm doing this is so I can boost the AC signal from a piezo sensor, the problem is, every time I set it up correctly (I think), without the signal inputs, it gets really hot, I've read the data sheet and kinda get whats going on.

I'm also not too sure how to hook up the signal, do I connect one cable to ground and one to the non-inverting, or do I connect it to Vcc-?

Thanks for the help y'all.

by Frostiger
December 07, 2019

How about giving us an elementary (schematic) diagram showing your setup. There's probably a simple explanation if all the information is laid out.

by Foxx
December 08, 2019

I kinda got what the problem was now, I didn't have -5v at the Vcc, but now I have to find out how to split supply a battery lol.

by Frostiger
December 08, 2019

1 Answer

Answer by Foxx

Take look at Since you say you want to boost an AC signal you have no choice but to use a + and - dc power supply, hence the 2 batteries of 3 cells each. Piezoelectric transducers typically have a high output impedance hence the noninvering unity gain op amp connection which has a very high input impedance. This is followed by an inverting op amp and you select Rf and Rin to get the gain you want. The LM358P package contains 2 op amps so you might as well use them.

+1 vote
by Foxx
December 09, 2019

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