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Audio duplex communication link schematic

2016-01-16 04:58  
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You need two of this circuits to create a duplex communication.
Duplex circuit adjustment: connect those 2 circuits thru a cable and inject a sinusoidal signal at 1KHz and 5Vef voltage into one circuit, the others circuit input must be shortcircuited. Adjust P1 for a minimum value at K2, then increase signal frequency to 10kHz and adjust C5 for a minimum value on K2. Repeat this operation for the other circuit.

Audio duplex circuit schematic

duplex communication schematic

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