Path: utzoo!attcan!uunet!sco!deanr From: deanr@sco.COM (Dean Reece) Newsgroups: sci.electronics Subject: Re: Latching Relay - does such a thing exist Keywords: relay, latching Message-ID: <3327@scolex.sco.COM> Date: 22 Sep 89 00:05:38 GMT References: <3558@dgis.daitc.mil> Reply-To: deanr@sco.COM (Dean Reece) Followup-To: deanr@sco.com Organization: The Santa Cruz Operation, Inc. Lines: 26 In article <3558@dgis.daitc.mil> generous@dgis.daitc.mil (Curtis Generous) writes: >I have an application where I need to activate a SPDT set of contacts >such that the toggle action does not release after the coil voltage is removed. >And I should then be able to toggle back the contacts with another pulse. >The best analogy is a SPDT RELAY that latches in the activated position until >another pulse comes and toggles it again. >If anyone knows of such a device, or can think of a way of building one.... They do exist. I had one once that had a 6 volt coil and SPST contacts. I connected it to a phototransistor with a straw on its end. The relay contacts were used to gate my TV speaker. Add one reasonably strong flash light and... Ta Da - a commercial (audio) killer for 3 bucks (my TV had no remote). Anyway, back to the subject: The relay used a ballpoint pen style latch mechanism. Each pulse to the coil toggled the contacts. These handy little gidgets are available from various surplus parts vendors. One supplier I know of for sure is All Electronics. I've dealt with them and have been fairly happy with their service. The only problem you may have is that the selection on the surplus market is variable and limited. I can hunt down the address & ph number if you need it. - Hope it Helps ______________________________________________________________________ | Dean Reece Member Technical Staff |"The flames are all long gone | | The Santa Cruz Operation 408/458-1422 | but the pain lingers on" | |___________deanr@sco.com_______________|___________________Pink_Floyd_|