latching relay system

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trex_202

Member - Posts: 2

Joined: September 21, 2009

Location: Norway

Posted: September 23, 2009 at 5:19 PM / IP Logged

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 :-(

latching relay system -- 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.

i am an idiot

Platinum - Posts: 13,709

This member consistently provides reliable information

Joined: September 21, 2006

Location: Louisiana, United States

Posted: September 23, 2009 at 6:00 PM / IP Logged

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

trex_202

Member - Posts: 2

Joined: September 21, 2009

Location: Norway

Posted: September 24, 2009 at 2:06 AM / IP Logged

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.

i am an idiot

Platinum - Posts: 13,709

Joined: September 21, 2006

Location: Louisiana, United States

Posted: September 24, 2009 at 5:45 AM / IP Logged

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

KPierson

Platinum - Posts: 3,527

Joined: April 14, 2005

Location: Ohio, United States

Posted: September 24, 2009 at 11:30 AM / IP Logged

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

Kevin Pierson

katman

Member - Posts: 15

Joined: September 24, 2009

Posted: September 24, 2009 at 5:13 PM / IP Logged

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?

"All paid jobs absorb and degrade the mind."

Aristotle

i am an idiot

Platinum - Posts: 13,709

Joined: September 21, 2006

Location: Louisiana, United States

Posted: September 24, 2009 at 6:05 PM / IP Logged

1n400X X = any number from 1 to 7

hotwaterwizard

Silver - Posts: 1,350

Joined: December 11, 2003

Location: California, United States

Posted: October 10, 2009 at 2:13 PM / IP Logged

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

latching relay system -- posted image.

John DeRosa (Hotwaterwizard)

Stockton California

When in doubt, try it out !

hotwaterwizard

Silver - Posts: 1,350

Joined: December 11, 2003

Location: California, United States

Posted: October 10, 2009 at 2:27 PM / IP Logged

You could just use all transistors to do the job.

latching relay system -- posted image.

John DeRosa (Hotwaterwizard)

Stockton California

When in doubt, try it out !

ckeeler

Gold - Posts: 1,461

Joined: June 20, 2008

Location: New Mexico, United States

Posted: October 10, 2009 at 4:22 PM / IP Logged

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.

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