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Conservitum Americum
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the phone has dc on it. an ac signal is sent to ring it. the ac and dc are on the same 2 wires. think of waves on the ocean. waves on top of the tide. some times it adds, sometimes it subtracts. in this case it is additive. put a voltmeter on your phone and watch when you ring it.
Better yet, wet your fingers and put them on the 66 block when someone rings in. Pow!
 
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