Intercom circuit with LM380


Posted on Apr 28, 2012

Very simple and useful circuit for communication between two person. The Q1 is used to amplify the weak output signal of speaker when one push his (her) side push-button to speak. The base-common configuration of the Q1 pre-amplifier is for matching low impedance speaker with input impedance of the pre-amplifier, then it can amplify the output speaker signal well. To drive the speaker, the circuit use an audio power amplifier IC, LM380.


Intercom circuit with LM380
Click here to download the full size of the above Circuit.

The circuit can be build on a vero board to obtain a good result, but if you use a PCB, it will work better and using of it will be easier.




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