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Line busy indicator
This circuit flashes an LED if the phone line is in use
or is ringing. It is powered by the phone line, and it uses so little
current that several of them could be used on the same line without
interference.
When first connected, let the circuit charge on an idle
line for a couple minutes before expecting it to work. A high-brightness LED
is recommended.
Andrew R. Morris
morr3763@bellsouth.net
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