New phone line protection circuit diagram

Published:2011/5/8 5:47:00 Author:Rebekka | Keyword: New phone line protection | From:SeekIC

New phone line protection circuit is shown as below. Telephone wiring in the T and R ends. When someone steal the outside line. BG1 will be conducted. The voltage between T and R is only 2V. The protection will reset automatically after hanging up. When you are calling, press K. If the LED does not light means there is eavesdropping; If the LED lights, it shows that lines are not tapped.



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