latched relays

[mulisharider10 10+ year member]

how do u make a latched relay. A relay that stays on with a pulse, and turns off with a 2nd pulse. I know there is a way to do it with regular 12v relays, just how do u? Im stuck. any ideas would help

Zach

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[MA-3D 10+ year member]

That is a tough one. The basic principal of a latching relay is pretty simple. Some of the equipment I work on uses those and we have far less trouble with them than normal relays that stay on all the time. I have actually thought about putting one together myself but I am not very skilled at building things. I can fix it but don't ask me to build it. Your easiest route might be go to a local electrical shop. If they don't have what your are looking for they may be able to point you in the right direction.

 

[ToyTundra 10+ year member]

http://www.the12volt.com/relays/page5.asp

scroll down a bit

 

[djman37 5,000+ posts]

great, either 4 or 5 relays!

 

[thch 10+ year member]

how do u make a latched relay. A relay that stays on with a pulse, and turns off with a 2nd pulse. I know there is a way to do it with regular 12v relays, just how do u? Im stuck. any ideas would help
Zach

what is this application for? it may be possible a semiconductor would work better.

 

[mulisharider10 10+ year member]

it was for for remote start on my 85 toyota. to turn the ignition on with a pulse from a aux output on a (-) output alarm channel. i figured it out with 3 relays. Actually 4 for the whole system. One relay for where

85 (- trigger)

(30a12v)30 87(starter)

86 (12v)

that relay gets the starter turning, and with the same trigger from the alarm this happens

____________m= middle relay L= Left relay R=Right relay

85(-trigger)_________85(87L&87M)___________85(2nd - aux output)

30(12v) 87(85m)___30(12v) 87(30R&85m)____30(87M) 87a(grd) 87 (free)

86(12v)______________86(grd)_________________86(12v)

the lines dont mean anything, thats just what i had to do to get the relays seperated.

If u can understand that faster than the 15 minutes it took me to write it down props to u. If not, i will take a picture of actuall relays to show u how it was done.

thanks for the help

Zach