dougy@spam.ma30.bull.com (Doug Lethin) (06/12/91)
Hello There has been much discussion in sci.electronics about line in use indicators recently. Another phone project that I would like to do involves taking a phone off hook by using either a 0 or 5v signal. I have not seen this in the past two months so I bring it to the newsgroups attention. My understanding is that I can just use a transistor, and connect the source to the either tip or ring, and connect the drain to then node where my phone would connect to the tip or ring, like a basic switch. When I want the phone to go off hook, I can just set the gat voltage to 5v. This will allow current to flow between source and drain. Is there something I am missing here. I know that this configuration will work like a switch for ttl DC levels, but will it work for AC connections like the phone. Any insight is appreciated. If there is a better way, or if the method mentioned will not work, please let me know. Thanks Doug dougy@bubba.ma30.bull.com -- == Douglas O. Lethin Bull HN Information Systems Inc. == == 508-294-5904 300 Concord Road MA30 803A == == dougy@bubba.ma30.bull.com Billerica, MA 01821 ==