LM324 microphone amplification circuit ----- LM324 Microphone amplifier

LM324 microphone amplification circuit, LM324 Microphone Amplifier Keywords: LM324 microphone zoom LM324 microphone zoom circuit The circuit is powered by ± 12V dual power supply. LM3244 feet are 12V power supplies. (11) The foot is a negative 12V power supply. The audio signal output from the microphone is small, not enough to push the audio amplifier circuit in the computer, so voltage amplification is required. The circuit uses the LM324 integrated op amp as a core pre-pre-processing circuit. Taking the L channel as an example, the microphone signal is adjusted by R1, the potentiometer RPL adjusts the sound, and then transmits the voltage amplification by the resistor R2 to the ICA, R3 is used to reduce the input resistance of the operational amplifier to improve the input anti-interference of op amp. ability. The op amplifier ICA output is added to the input negative end to the negative feedback element R5, CL, and the filling is amplified, and the magnification is about (1 + R5 / R4). The signal is amplified after the resistance R13, and the inverted input end of the next level is sent to the next level. R7, C3 is a negative feedback circuit of the post-level op amp, and the signals enlarged by the two-stage amplifying circuit are then output to the computer line input jack by C4, R8. R channel is the same. Circuit characteristics: This circuit uses high performance op amp LM324 to add negative feedback to the amplifier, low noise, strong anti-interference ability, and less components, convenient production, and high success rate. Can be widely used in campus with computers to sing karaoke or recording.

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