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wireless remote control phone lock circuit

2016-11-25 02:20  
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wireless remote control phone lock circuit
The key of the telephone lock uses the remote controller form, the remote controller is in charge of the owner or office leader, the lock actuator is installed in the telephone. Only if you press the button on the remote controller, the lock will be opened and then you can dial. But the three numbers public phones such as the 119 , 110 , 120 .etc are not limited by this lock, also the answer. This circuit do not need the external power supply or mechanical lock, so it has some practical value.