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LM390 MiNi Intercom

2018-01-25 00:02  
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Today we find many of the IC number LM390 in the old tool box. I see that my son is boring, and do not want him sitting to play the games computer all day so have new ideas. Let’s make up an small intercom projects with old equipment.
In the figure simple circuit we used two the speaker, The first represents the microphone input. When talking they can hear the speaker output. We make the LM390 audio amplifier IC is small, only 1-3 watts. When a two series circuit, using switch to the choice between speaking and listening, it will be a small intercom.
See to Detail in Circuit.

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