Simplified Long-Distance Call Lock Circuit Diagram

Published:2011/9/7 0:43:00 Author:Vicky | Keyword: Simplified Long-Distance Call Lock Circuit | From:SeekIC

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 be made while it does not affect dialing “0” when making local calls; if K is placed to the left, then the lock does not function.



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