special app single pulse lock/unlock
Printed From: the12volt.comForum Name: Relays
Forum Discription: Relay Diagrams, SPDT Relays, SPST Relays, DPDT Relays, Latching Relays, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=105310
Printed Date: June 04, 2024 at 5:16 AM
Topic: special app single pulse lock/unlock
Posted By: frascati
Subject: special app single pulse lock/unlock
Date Posted: June 07, 2008 at 12:06 PM
I don't understand how the latching relay (top one?) can reset? It is a single coil relay and there is nothing in the diagram that indicates that the switch is capable of delivering a pulse of different polarity.
There must be a second switch therefore, no? I guess I'm confused by the range of meaning with "single pulse" "single switch" "impulse" etc.
I'm trying to find a purely electromechanical way of using a single momentary switch to operate a latching dpdt relay. Seems like it should be doable with no more than three relays, but I can't get the logic straight. There is a Magnecraft 711 series relay, but it's just too physically bulky for my use.
I'm trying not to have to resort to using a little barrel push solenoid connected to a little latching dpdt pushswitch, but it may come down to that.
Replies:
Posted By: the12volt
Date Posted: June 07, 2008 at 12:31 PM
The top relays works similar to a ball point pen. Inside the relay is a mechanical latch that catches or releases each time the coil is energized closing or opening the contact with the common terminal.
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the12volt • Support the12volt.comPosted By: frascati
Date Posted: June 07, 2008 at 2:11 PM
then that relay must be the size of the magnecraft 711?
I have searched e v e r y w h e r e for a solid week now. I've asked dozens of experts, engineers, and salespeople if a relay with a ratching mechanism for allowing it to use the same polarity per operation existed in a pcb version. They all said no. I looked through google for two days straight. Still nothing. The one photograped in that circuit..
is a pcb mountable relay. If you can tell me where to purchase this you will be my hero! (I'm not being sarcastic. this experience has been that frustrating!)
I have searched e v e r y w h e r e for a solid week now. I've asked dozens of experts, engineers, and salespeople if a relay with a ratching mechanism for allowing it to use the same polarity per operation existed in a pcb version. They all said no. I looked through google for two days straight. Still nothing. The one photograped in that circuit..
is a pcb mountable relay. If you can tell me where to purchase this you will be my hero! (I'm not being sarcastic. this experience has been that frustrating!)
Posted By: frascati
Date Posted: June 07, 2008 at 7:27 PM
Posted By: the12volt
Date Posted: June 07, 2008 at 7:33 PM
I purchased the last few from Pelican Electronics in Metairie, LA many years ago. When I get back in town, I'll be happy to check with my suppliers for the relay shown in the picture. BTW, I know that I have at least one left as it is the one in the picture.
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the12volt • Support the12volt.comPosted By: i am an idiot
Date Posted: June 07, 2008 at 10:40 PM
Posted By: the12volt
Date Posted: June 07, 2008 at 11:33 PM
Posted By: i am an idiot
Date Posted: June 08, 2008 at 12:20 AM