Path: utzoo!utgpu!water!watmath!clyde!att!pacbell!ames!killer!vector!nobody From: mgrant@cos.com (Michael Grant) Newsgroups: comp.dcom.telecom Subject: In use light Message-ID: Date: 30 Sep 88 19:21:15 GMT Sender: chip@vector.UUCP Lines: 17 Approved: telecom-request@vector.uucp (USENET Telecom Moderator) X-TELECOM-Digest: volume 8, issue 148, message 8 X-Submissions-To: telecom@xx.lcs.mit.edu (Mailing List Coordinator) X-Administrivia-To: telecom-request@vector.uucp (USENET Telecom Moderator) A long while ago someone posted a question about how to build a simple circuit which would light a LED (or a simple lamp) when an extension was lifted elsewhere in the house. The requirements are: - The LED lights when another extension is lifted, showing that it is in use. - The LED must be powered off the phone line. - No extra wires must be run to the telephone. - The circuit should be reasonable small so that it can fit inside a desktop style phone. No one was able to come up with a simple schematic to do this that worked. The upshot was that one could buy such a device for about $30 off the shelf. Having let some time pass, anyone want to give a stab at this? -Michael Grant