Microphone Input Signal Amplifier Circuit

Published:2011/7/14 6:28:00 Author:Sue | Keyword: Microphone, Input Signal, Amplifier | From:SeekIC

The earphone amplifier(U1,MAX4411) and the microphone amplifier(U2,MAX9812) can use 3v battery as supply power directly. When it is in standard mode, these two appliances are both disconnected, which will consume extra-low battery current. When there is need to talk with others, only the transient switch SW1 should be pushed to start the microphone. Then the microphone's amplifier's bias output will be opened which can amplify the outside audio signal. Then connect the amplified signal to the earphone amplifier and put it into earphone's audio signal through resistor R3,R4. Another advantage of such mix method is that the earphone amplifier's low-impedance(when started) can decay the earphone access's audio current.



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