Simplified Long-Distance Call LockCircuit


Posted on Feb 6, 2014

Simplified long-distance call lock is shown in the above picture. The lock can lock out the long-distance call without affecting the original function. It ispower-consuming, but it has very good compatibility. If switch K is placed as the picture shows, first dial the number 0,, and you ll find the 0 can not be dialed and the long-distance call can not..


Simplified Long-Distance Call LockCircuit
Click here to download the full size of the above Circuit.




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