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Here is a super simple phone busy indicator. It should only cost a few dollars to build!
“Have you ever been using the modem or fax and someone else picks up the phone, breaking the connection? Well, this simple circuit should put an end to that. It signals that the phone is in use by lighting a red LED. When the phone is not in use, a green LED is lit. It needs no external power and can be connected anywhere on the phone line, even mounted inside the phone.”
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July 10th, 2008
Nice rip-off of someone else’s idea. You don’t even specify the resistances of the restistors the type of LED or even which one is read or green.
Found this same diagram here: http://www.aaroncake.net/Circuits/phonbusy.asp
April 30th, 2009
I guess that’s why the words “phone busy indicator” are linked to http://www.aaroncake.net/Circuits/phonbusy.asp.