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Basic Electronics » Amplifiers

October 29, 2010
by lcruz007
lcruz007's Avatar

Hello, I'm trying to amplify a low-frequency signal which has a short peak of just some microvolts.

What amplifiers would you recommend me for this application?

Thanks in advance.

October 29, 2010
by hevans
(NerdKits Staff)

hevans's Avatar

Hi lcruz,

Have you tried doing something like the single transistor amplifier we use in the sound meter video? You probably have some 2n7000s around and can give it a quick test to see if it will suit your needs.


October 30, 2010
by lcruz007
lcruz007's Avatar


Sounds like a perfect way to amplify the signal. I just bought a couple of 2N3904 NPN and also got some 2N700 from some past projects :)

The signal I am talking about is between 5Hz and 50Hz, and its amplitude is maybe just some microvolts (μV). Will this work for me?

Thank you.

October 30, 2010
by Ralphxyz
Ralphxyz's Avatar

Make sure and use capacitors to quiet any noise at that level random noise could be confused for a actual signal.


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