AUTOMATIC_TELEPHONE_CALL_RECORDING_CIRCUIT

Published:2009/6/22 22:11:00 Author:May | From:SeekIC

The dc voltage present on a telephone line is usually around 45 to 50 V on-hook and 6 V off-hook. This circuit uses this drop in voltage to activate a relay. The relay controls a cassette tape recorder. Audio is taken off through a network to the microphone input of the cassette.



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