ISP Information:
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Electronic signature - On Mon, 15 Dec 2003 21:54:27 -0500, Marcus Didius Falco wrote: On Mon, 15 Dec 2003 05:39:27 PST Fred Atkinson wrote about Off Hook (110 Volt) Lamp: What I am looking for is something that would turn on a 110 Volt lamp while the phone is off the hook. This would clue Dad in to the fact that he left the phone off the hook again. A little LED isn't going to get his attention. It sounds like a custom assembly, and you might want to get in touch with a local chapter of the telephone pioneers -- retired phone people who do special assemblies for the handicapped. I can suggest one way to do it: when the line has been off-hook for a while it "goes dead". IF, and this is a big IF, the phone company actually removes the normal 48vDC from the line, this could be used to trip a relay. Take a Normally Open relay, and rely on the 48vDC to hold it open. When the 48vDC goes away, then it will close, and this can turn on a lamp.Except that the 48V drops to 6 to 12V when the phone is actually inuse. It would work, but not as you describe. The relay would kickwhenever the phone was in use, talking or ignored off hook. If all the phone company removes is the "buzz" from the line, then it is more complex -- you're dealing with detecting the AC on the line.Sandman had or still has something in his catalog that connects inseries with the telephone. When the phone is left off-hook, and the"howler" comes on line, this box recgonizes it, disconnects the phonethat is downstream, and has its own internal loud ringer to signal thenext incoming call. When the handset is returned to the hook, itreconnects automatically.http://sandman.com. Hehas stuff like that; some of the things are ready to use, some requirean additional relay. PAT]
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