Latched on/off output with single pulse

Printed From: the12volt.com
Forum 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=19349
Printed Date: May 02, 2024 at 10:02 AM

Topic: Latched on/off output with single pulse

Posted By: Trev01
Subject: Latched on/off output with single pulse
Date Posted: September 26, 2003 at 10:39 PM

Hi to all,

I have been trying to build the latched on / off output relay system with a single momentary pulse, (located on this site), and cannot get it to switch off. The power supply I am using is a 12 volt dc bench unit. I have tried to switch a LED, a 12v 55watt lamp, and a SPDT relay as I thought the load may influence the result. All wiring has been checked against the circuit diagram, all the wiring continuity has been checked, with no fault found. I have tried both the 5 relay (no diodes), and the 4 relay (diode) versions. Same result with both. Negative pulse switches on, but I must kill the 12v+ supply to turn it off.

Have I missed something? has anyone else built this and got it working?

Regards,

Trev01.

Replies:

Posted By: Trev01
Date Posted: September 26, 2003 at 11:04 PM

As I was typing the help note, I had a new thought . Checking the relay operations, I discovered 1 relay had a subtle difference. Yep, one is not a SPDT relay. Has the two output pins, but they are linked internally.

Oh well, red face and all, I can now get it to work.

Trev01 . posted_image

Posted By: xetmes
Date Posted: September 27, 2003 at 6:42 AM

you can also do with with electronic components, and 1 relay, would draw less current but would require more than just relays...

Posted By: cool_greg
Date Posted: September 27, 2003 at 10:35 AM

or you can just go and buy a mechnical latching/unlatching relay relay

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Just a Guy, Wiring up those Vehicals
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Gool_Greg

Posted By: xetmes
Date Posted: September 27, 2003 at 12:58 PM

cool_greg wrote:

or you can just go and buy a mechnical latching/unlatching relay relay

really? i have never seen a relay that toggles like that, the only ones i see require the polarity to be reversed to toggle posted_image

Posted By: the12volt
Date Posted: September 27, 2003 at 1:17 PM

xetmes, these are PCB mounted relays. Each time you energize the coil, the contacts will either stay closed or stay open, similar to the action of a ball point pen with each click of the button on top. I had a local supplier for these some time ago and I only have one of these relays left. As soon as I find another supplier for them, I'll share it with everyone. Here's another topic using this relay: https://www.the12volt.com/installbay/forum_posts.asp?tid=10506

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Posted By: the12volt
Date Posted: September 27, 2003 at 1:25 PM

Trev01, glad to hear you found the problem. BTW, the SPST dual make relay you have is great to use when you need to wire parking lamps on vehicles with independent left and right parking lamp circuits (Porsche, Mercedes, BMW, etc.)

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the12volt • Support the12volt.com

Posted By: xetmes
Date Posted: September 27, 2003 at 6:43 PM

wow thats cool, i only see latching relays that need the polarity reversed to toggle state, that sure would make toggle applications easier.