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Automatically Telephone Call Record Circuit

2016-02-03 20:53  
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This circuit is used to record the calls automatically. A idle tape recorder at home connected with the telephone to record the phone calls  automatically.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 tapeTecorder.Audio is taken off through a network to the microphone input of the cassette.A tape recorder is a device that uses electromagnets to record and play back sound. Once the sound is recorded, it can then be reproduced using the player component that almost any tape recorder will have.
 

Telephone Call Recording Circuit Circuit