Hearing-aid (the 2nd)

Published:2011/6/6 5:14:00 Author:Felicity | Keyword: Hearing-aid (the 2nd), | From:SeekIC

Work of the circuit The hearing-aid circuit consists of mike BM, resistor R1 and R2, capacitor C1-C4, potentiometer RP, integrated circuit, power switch S and earphone BE. (It is showed in picture 9-78.). BM collects the sound signal andturns itinto faint electric signal. Then the signal is inputted from IC’s pin 7 through CI and RP. At last it is returned to sound by earphone after being amplifier. If you change the value of RP you can change the volume.



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