latcing relays

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=38067
Printed Date: May 05, 2024 at 12:48 AM

Topic: latcing relays

Posted By: ashbyspannerman
Subject: latcing relays
Date Posted: August 25, 2004 at 4:57 AM

I'm wiring a bike for a friend, he's fitted monentary switches in the handle bars and i need to get a latched output from them. i purchased latching relays but cannot figure out how to wire these so that one push = on the next = off!

unfortunately the only relays i could get hold of are twin coil latching relays, one coil on, one coil off, can anybody think of a way these could be used in a simple circuit so that the same button is used for on and off? maybe using another relay alongside?

i have seen the circuit using four or five relays, if i have to go this way i will, but that will mean i'll have to find room for a minimum of twenty!!! relays.

Replies:

Posted By: hotwaterwizard
Date Posted: September 02, 2004 at 11:47 PM

When Power is Applied to the first coil it will latch.

When power is applied to the second coil it will un latch.

Kind of like a Mechanical Flip-Flop.

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John DeRosa (Hotwaterwizard)
Stockton California
When in doubt, try it out !

Posted By: hotwaterwizard
Date Posted: September 02, 2004 at 11:50 PM

posted_image

Here is a circuit with a Standard Relay

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John DeRosa (Hotwaterwizard)
Stockton California
When in doubt, try it out !

Posted By: hotwaterwizard
Date Posted: September 03, 2004 at 12:01 AM

posted_image

Here is What you have now.

When 12v is on the LATCH terminal for even a second and removed the Relay remains latched. The only way to un latch it is to apply power to the UNLATCH terminal.

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John DeRosa (Hotwaterwizard)
Stockton California
When in doubt, try it out !

Posted By: hotwaterwizard
Date Posted: September 08, 2004 at 7:28 AM

Here is a Latching Relay using a Standard Cube Relay.

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John DeRosa (Hotwaterwizard)
Stockton California
When in doubt, try it out !

Posted By: ashbyspannerman
Date Posted: September 08, 2004 at 10:27 AM

Hi john thanks for the reply, the problem i have is the bike is already fitted with 5 momentary contact switches in the handlebars, it's not possible to fit more. This is going to be a 'show' bike and has to look just so, i have brought some miniature relays cos i've got to be able to turn things on and off with the same switch! so it looks like i'm going to need 20 relays in a box, arranged in sets of four as shown in the latching circuit elsewhere on this site!

cheers

Charlie (ashbyspannerman)

Posted By: hotwaterwizard
Date Posted: September 08, 2004 at 6:30 PM

Let me see if I can wirk out a smaller version for you. You could use a circuit instead of all of those Relays.

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John DeRosa (Hotwaterwizard)
Stockton California
When in doubt, try it out !

Posted By: hotwaterwizard
Date Posted: September 08, 2004 at 6:35 PM

Here is a sample Circuit that uses a 6v relay to operate 12v with one button.
posted_image

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John DeRosa (Hotwaterwizard)
Stockton California
When in doubt, try it out !

Posted By: hotwaterwizard
Date Posted: September 08, 2004 at 9:24 PM

Here is a Circuit I just Made for you.

posted_image

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John DeRosa (Hotwaterwizard)
Stockton California
When in doubt, try it out !

Posted By: ashbyspannerman
Date Posted: September 09, 2004 at 4:19 AM

Thanks again John! i'll be off to my local electrical store and pick up the bits today!!!!

Posted By: hotwaterwizard
Date Posted: September 10, 2004 at 6:57 PM

good luck.

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John DeRosa (Hotwaterwizard)
Stockton California
When in doubt, try it out !