Circuit Of Intercom Speaker

Published:2011/4/20 21:54:00 Author:TaoXi | Keyword: Intercom Speaker | From:SeekIC

The circuit of intercom speaker in one direction is as shown (the other direction circuit is the same). The core component of the intercom speaker is the LM324 (ICl quad op amp integrated circuit), each amplifier in both directions uses two of four operational amplifiers. The microphone BM1 is one kind of high sensitivity miniature electret speaker devices, the model is 84G9, you should notice the polarity when welding. Two-stage op-amp ICl-1, ICl-2 and the external components make up the negative-feedback amplifier. R7, R11 are the negative-feedback resistor which is used to improve the stability of the circuit. Potentiometer RPl is used to fine-tuning the operating point, make the waveform symmetry, also reduce the non-linear distortion. Resistor Rl, capacitor C3 form the decoupling filter circuit to reduce the power supply hum.



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