12V Latching relay---Need

[Fuzz]

I have some stuff left over from burglar alarm install from about 25years ago. . time flys. .

Anyway would like to take one of the RF receivers and hook it up to the "Scare lights" on my 5'er.

I tried it with a regular Bosch relay and it will work,but of course they will not stay on .

Just wondering if there may be a latching relay,one click on,next click off. I have done some searches on the web,but no luck

Thanks for any help

Fuzz

 

[LSMITH]

Fuzz, WW Grainger has the relay and socket you want. They have an online catalog, check it out.

 

[illflem]

LS, is right except you will have a hard time coming up with a 12 VDC one if that is what you're after.

 

[Fuzz]

Thanks all

Don't know why I didn't try Graingers. . thanks for the wake up call.

Did a search on their web page and the first one listed is 12vDC. It is DPDT. . Oughta be able to find one there.

Thanks again

Fuzz

 

[Cooker]

I'd be interested in a source for 12v latching relays.

 

[emarsh]

potter broomfield makes a few12vdc types, one is a cube type and has a socket available.

Try Newark Electronics, 1-800-4-newark

you want a latching relay, pulse for on, reverse polarity pulse for off. I have used these many times before, however I don't have a potter broomfield catalog at present. ED

 

[PRout]

You can make a relay "latching" by taking its output power & using it to feed its own trigger ckt.



You can feed the trigger ckt from another relay's normally closed ckt, so that when you activate it, it momentarily releases the second one.



I had to do this several times in the past, and would have to re-remember the easiest way to wire them, but it works like a champ. W/ a little creativity, you can make it pretty fancy.



Seems to me, if you use 3 relays, the first one activates the latch, and the second one momentarily deactivates it w/ its normally closed contacts. Or use a norm closed momentary push-button switch to release it.



Have done it w/ the bosch relays, they work fine.

 

[Fuzz]

Shortshift,

Interesting,I will have to fool around with that concept,happen to have 3 relays laying around. Will see what happens... I gotta be the most dangerous man around with a soldering iron(G).

 

[emarsh]

the relays I spoke of are mechanically latching, there is no power draw to keep them in the "ON" position.

 

[DieselDoghouse]

Another option is a digital latch, can use a cheap IC chip ala RadioShack, etc. to control a regular relay. One push on, one push off—BUT whenever the ignition is off and restarted switch automatically reverts to off. Its a cousin to the chip that runs our mirror heaters (without the countdown timer). I used on for my washer heater to avoid unintended heating.

 

[illflem]

Shortshift, excellent idea! It can be done with one relay and two momentary contact switches, one to make and one to break. I wouldn't worry about current draw, relays draw very little and most are rated for continuous duty.



I used much the same idea when the timer for my battery charger went south. Wired the clock motor on a cheapo household timer to the switched output. This way when the timer shuts down it doesn't continue running to start another cycle, it has to be manually restarted. I know there are other methods but this one was handy.

 

[mongoose]

i would be grateful if someone could post a diagram. i to have thought of using the extra button on my alarm remote to trigger some lights.

 

[Scot]

Security/fire alarm relays commonly do this. It uses a double set of contacts on the board. A momentary switch sets it. How many amps are you pulling?

 

[tgbol]

NAPA sells a light latching relay. It is the NAPA lighting line and used as a high beam relay. Click it is on and click it is off.