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並前往http://centrallibrary.cit.ac.in/dir/Project%20Report/2018/Diploma/ETE/Sound%20detector%20using%20Op-Amp%20741.pdf

SOUND DETECTOR using Op-AmP74l - Central Library | CIT ...

HPF is used for noise reduction purpose. 3. Amplifier amplifies the signal 100 times. 4. Peak detector holds the signal for a few mille second.

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