Hearing-aid (the 1st)

Published:2011/5/19 21:17:00 Author:Felicity | Keyword: Hearing-aid (the 1st), | From:SeekIC

Work of the circuit The hearing-aid circuit consists of mike BM, volume potentiometer RP and two-step amplifier circuit (It is showed in picture 9-77.). Sound signal is collected and translated into electric signal by mike BM. Then it is inputted into IC’s pin 2 through CI and R4 and outputted from pin 1 after being amplified by amplifier N1. At last it is returned to sound by earphone after being amplified by operating amplifier N2.



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