Path: utzoo!attcan!uunet!pyrdc!netsys!vector!nobody From: wheels@mks.UUCP (Gerry Wheeler) Newsgroups: comp.dcom.telecom Subject: sensitive relay wanted Keywords: line pickup relay Message-ID:Date: 23 Sep 88 16:00:23 GMT Sender: chip@vector.UUCP Organization: Mortice Kern Systems, Waterloo, Ont. Lines: 23 Approved: telecom-request@vector.uucp (USENET Telecom Moderator) X-TELECOM-Digest: volume 8, issue 146, message 4 X-Submissions-To: telecom@xx.lcs.mit.edu (Mailing List Coordinator) X-Administrivia-To: telecom-request@vector.uucp (USENET Telecom Moderator) I'm looking for a relay to place in series with a telephone which will open (or close) when the set is offhook. The closest I've come is with a 200 ohm 4.5 mA relay. It didn't affect the phone operation too much, but wouldn't quite pull in. If I pressed the armature in, it would latch. Close, but no cigar. Perhaps I should describe what I'm up to. I want to share a phone line between a fax machine and a phone or modem. Only the fax will receive incoming calls. I want to put a relay coil in series with each device. Its normally closed contacts will be in series with the *other* device. Thus, when one is in use, the other is excluded. So, what type of relay should I be looking for (impedance/current). Is such a thing commonly available? Will this scheme work? Does ringing current cause any problems? Our site doesn't receive this group, so direct email would be appreciated. -- Gerry Wheeler Phone: (519)884-2251 Mortice Kern Systems Inc. UUCP: uunet!watmath!mks!wheels 35 King St. North BIX: join mks Waterloo, Ontario N2J 2W9 CompuServe: 73260,1043