latching relay with negative output

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=71271
Printed Date: April 27, 2024 at 6:31 AM

Topic: latching relay with negative output

Posted By: wblakes
Subject: latching relay with negative output
Date Posted: January 22, 2006 at 10:24 AM

can some one please show me how to create a latching relay that will give a negative output through a momentary switch and will reset with ignition? i want to use as less parts as possible. please list part numbers if available. thank you...

Replies:

Posted By: fingaz22
Date Posted: January 22, 2006 at 10:52 AM

Similar to the momentary to constant configuration above, we can engage and disengage the latched output with a single pulse from a switch or an output from an alarm or remote keyless entry. The first pulse from the switch will engage the latch. The next pulse from the switch will disengage the latch.
posted_image

Here's the same configuration as the one above that you can use if you do not have any *diodes available and/or only want to use SPDT relays. A negative output from an alarm, remote keyless entry, or other device can be used in place of the switch shown in both of these diagrams.
posted_image

you can use the top relay setup found here in the 12 volt site. and use one more relay to swith the pos. output to a neg. output. by using the output of the latching relay setup on the 85 side of the extra relays coil and 86 to ground then ground jumped to 87 and there on 30 you will have your neg. output.

or if you don't like building things and want a easier way out goto ebay they have them for sale. just check the max current rating because some of them will not surpport car application unless an extra relay is added to carry the draw.

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Posted By: firstrax
Date Posted: January 22, 2006 at 11:30 AM

This should work.

Add fuses and diodes where appropriate.

posted_image

Posted By: techguy688
Date Posted: January 22, 2006 at 6:50 PM

you can find these relays at your local auto store. and diodes from radio shack. Or you can mail order them through several companies such as the link below.
https://www.partsexpress.com/pe/pshowdetl.cfm?&DID=7&Partnumber=330-070&ctab=14

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Just because you've done something for a long time doesn't mean you're any good at it.
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Posted By: wblakes
Date Posted: January 22, 2006 at 11:02 PM

i'm sorry to ask, but can you tell me where to place the fuses and diodes? thanks..

Posted By: firstrax
Date Posted: January 22, 2006 at 11:32 PM

wblakes wrote:

i'm sorry to ask, but can you tell me where to place the fuses and diodes? thanks..

New and improved with diode and fuse goodness.

posted_image

Posted By: wblakes
Date Posted: January 22, 2006 at 11:34 PM

thank you..........

Posted By: firstrax
Date Posted: January 23, 2006 at 12:02 AM

The silent "click free" method.

posted_image

Posted By: wblakes
Date Posted: January 23, 2006 at 8:59 AM

thanks firstrax, i really appreciate your help. for your click free diagram where i can i the diode schottky? i couldn't find on the radio shack website. is it the same as the regular diode or not?

Posted By: firstrax
Date Posted: January 23, 2006 at 6:56 PM

wblakes wrote:

thanks firstrax, i really appreciate your help. for your click free diagram where i can i the diode schottky? i couldn't find on the radio shack website. is it the same as the regular diode or not?

A schottky (pronounced "shot-key") diode is like a regular diode except the voltage drop is lower. usually less than 0.5 volts. Very handy for protecting against reverse polarity. A regular diode will probobly be fine. The diode as a whole might be optional. Not knowing what you are switching I was trying to provide isolation from ignition.

Posted By: kreativesailor
Date Posted: January 31, 2006 at 8:33 PM

I like that silent click method. I may use it my self some day.

If not interested in building the solid state version though you can build this one as shown on this picture. Is pretty much like the one that firstrax posted but minus a relay. I figured if you want to build it with the least parts as possible this might be a good bet. Less bulky I figure. Nevertheless, the silent free method may be the one i'll use.

Sorry if the picture dont look pro, but I did the best I could. Good luck in doing whatever that you are doing!

posted_image

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Posted By: kreativesailor
Date Posted: January 31, 2006 at 8:35 PM

Not sure wh posted_image

at happened to the image but here it goes again...

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You can try and fail but dont fail to try...

Posted By: kreativesailor
Date Posted: February 01, 2006 at 12:35 AM

Sorry guys but I could'nt get the picture any smaller when I posted. If you download the picture you'll be able to see it as its supposed to.

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You can try and fail but dont fail to try...