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AM Demodulator

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Hi everyone

I have just arrived here - it's nice here!

I was wondering if anyone could help me in finding a cheap AM Demodulator IC which can operate down to DC frequency (the modulating wave). I want to measure the envelope of a sound wave which may be the same intensity for several minutes at a time. Also if I can use it single-sided that would help too.

I've tried making my own envelope detector circuit which sort of works, but not very well.

Thanks to anyone who can shed some light 8)

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