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Author Topic: Hack a stereo amp for VLF operation  (Read 1129 times)
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Dallas
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Is it possible/easy to hack a cheap stereo amp so that it will operate down to DC?

I would like to be able to generate a sine wave, at frequency from 0 to a couple hundred Hz, and drive at least 500mA. If there is some way to hack a stereo amp to be able to go this low in frequency, then it would work, but I don't know if you can just remove the output coupling capacitors or if it's more complicated than that.
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Montreal
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Do you mean  specific amplifier? In general, almost any power amplifier I've seen are DC , you only have to remove cap at input , but check bias voltage first before you connect to source.
Output cap usually presents if single power used, low/middle power range.
Probably you can open it up and read a printing on IC?
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Hi, audio amplifiers are designed to have a lower cut off at about 20hz. So your idea of  hacking a 'cheap amp' would be difficult. It sounds like what you need is an instrumentation amp.

Cheers
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