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New phone line protection circuit diagram

2016-09-12 04:04  
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New phone line protection circuit diagram
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.