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Telephone electronic lock circuit diagram

2017-01-08 10:44  
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Telephone electronic lock circuit diagram
Telephone electronic lock uses the key (there is a resistance plug)inserts into the circuit and makes the periodic circuit start to oscillation. And the accuracy of the oscillation frequency can decide whether the telephone call can be opened and the receive of the external calls will not be affected. This can make sure that only the man who owns the key can uses the telephone. The circuit of the telephone electronic lock is shown as above. It is mainly composed of frequency key unlock circuit, ringing signal identifyinglock circuit, self-locking lock circuit and other components.