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CABLE_TESTER_TRANSMITTER

2016-04-02 23:56  
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CABLE_TESTER_TRANSMITTER
Four 567 tone-decoder ICs, IC1 to IC4, are used to generate four different audio frequencies between 700 and 950 Hz. The capacitor from pin 6 of each 567 to circuit ground, along with the resistor between pins 5 and 6, sets the operating frequency. A 2N3904 NPN transmitter is connected in an emitter-follower circuit to isolate the ICs from output loading. Each output supplies a different audio tone to four wires in a cable.