Plug-in remote telephone ringer

Posted on Dec 30, 2012

This device consists of a ring detector connected to the telephone line. When the telephone rings, the ring detector impresses high-frequency pulses on the ac power line.

Plug-in remote telephone ringer
Click here to download the full size of the above Circuit.

A receiver placed anywhere on the same power line detects these pulses and emits an audible tone in synchronization with the telephone signal.

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