latching relay system

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=116507
Printed Date: May 16, 2025 at 4:13 AM

Topic: latching relay system

Posted By: trex_202
Subject: latching relay system
Date Posted: September 23, 2009 at 5:19 PM

Hi.

I had the need for a switching relay, and ended up with the designed shown in the figure.

However, I have a problem, the relays switches on an off 50 times a second :-(

posted_image

Is there any easy way of creating a debouncer for the push button?

The bi-stable relay needs a polarity change, therefore the setup.

Regards,Tommy.

Replies:

Posted By: i am an idiot
Date Posted: September 23, 2009 at 6:00 PM

Would a latching relay with a pushbutton to latch and the same pushbutton to unlatch help you at all?

Posted By: trex_202
Date Posted: September 24, 2009 at 2:06 AM

Yes, this is going to be used for switching on/of some lights, and the factory switches are push-type. So nothing I can do about it.

However, the solution I am after is some way of sending a pulse. I tried with a 555 timer IC, but the output of that is not high enough current to work the coil of the relay.

Any suggestions?

Tommy.

Posted By: i am an idiot
Date Posted: September 24, 2009 at 5:45 AM

https://www.the12volt.com/relays/page5.asp#lsp

Posted By: KPierson
Date Posted: September 24, 2009 at 11:30 AM

Take the output of the 555 timer and run it through a transistor to the relay

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Kevin Pierson

Posted By: katman
Date Posted: September 24, 2009 at 5:13 PM

Looking at the schematics I found no values for the diodes in the circuits operating the coil of the various relays. Any clues to a post showing the value needed to carry such a load?

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"All paid jobs absorb and degrade the mind."
Aristotle

Posted By: i am an idiot
Date Posted: September 24, 2009 at 6:05 PM

1n400X X = any number from 1 to 7

Posted By: hotwaterwizard
Date Posted: October 10, 2009 at 2:13 PM

A Relay switching that fast will make a soundnd like a buzzer. Better to use a couple of Transistors.

posted_image

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

Posted By: hotwaterwizard
Date Posted: October 10, 2009 at 2:27 PM

You could just use all transistors to do the job.

posted_image

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

Posted By: ckeeler
Date Posted: October 10, 2009 at 4:22 PM

your 555 setup will work by just adding a transistor to activate the relay like KP suggested. if you already have the 555 setup built, it's a lot less work to just add a transistor than to start all over from scratch.

Posted By: hotwaterwizard
Date Posted: October 13, 2009 at 12:55 AM

I tried the 555 circuit and it failed miserably

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

Posted By: ckeeler
Date Posted: October 13, 2009 at 8:52 AM

bummer. seemed pretty ideal, but i never bench tried it, so it was just that i guess, an idea.

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