Relay To Replicate Momentary Switch

Home / the12volt's Install Bay / Relays / Relay To Replicate Momentary Switch (

Topic Closed)

Welcome Guest :)

Members

Next Page > < Prev Topic Next Topic >

W3bma5t3r

Member - Posts: 6

Joined: June 27, 2004

Location: United States

Posted: April 12, 2006 at 6:19 AM / IP Logged

Ok, I've searched google and the forums here and I seem to just be getting more confused.

What I would like to do is use a relay (or if there is something better for this) as a momentary switch without requiring manual intervention. Basically when the relay gets power, it shorts(closes) two wires out momentarily, and then goes back to normally open. Is this possible? Is there a better way to do this?

Thanks in advance. The assistance is greatly appreciated :-)

ff-mike

Copper - Posts: 199

Joined: November 15, 2004

Location: United States

Posted: April 12, 2006 at 9:30 AM / IP Logged

Google monostable multivibrator and use that type of circuit to control any normal relay

W3bma5t3r

Member - Posts: 6

Joined: June 27, 2004

Location: United States

Posted: April 13, 2006 at 3:59 PM / IP Logged

Thanks for the reply. I did look up the circuits and they look like exactly what I need, except for one thing... I don't want to send power out on the line, I only want to short two wire together. I'm no electronics guru so do you have any ideas on how to adapate one of those circuits to what I need? I can build the circuit, that's no problem, just not great at figure the circuit itself out. Thanks again :)

hotwaterwizard

Silver - Posts: 1,350

Joined: December 11, 2003

Location: California, United States

Posted: April 13, 2006 at 8:58 PM / IP Logged

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

The capacitor allows the coil of the relay to be energized until the capacitor stores a charge, thus de-energizing the coil. The resistor bleeds off the charge of the capacitor when positive voltage is removed from the other side of the coil. You can increase the output time by simply changing the value of the capacitor. This one will give you about a 1/2 second output.

Instead of power on 30 and 87 just use those terminals as your contacts instead. It just shorts out those 2 terminals.

Relay To Replicate Momentary Switch -- posted image.

John DeRosa (Hotwaterwizard)

Stockton California

When in doubt, try it out !

Search for other posts by hotwaterwizard

W3bma5t3r

Member - Posts: 6

Joined: June 27, 2004

Location: United States

Posted: April 13, 2006 at 9:24 PM / IP Logged

This isn't a one shot circuit though is it? This will continue to short out the circuit on a timeframe controlled by the cap size right?

correct me if I'm wrong... just want to make sure I understand everything right.

Basically, I have two wires, when shorted out (button pushed and released) with a momentary switch, they turn a device on. Basically what I want to do is when I start the car up, a relay (or other device/circuit) shorts out the two wires 'once' and that's it. It won't do anything again till the vehicle is started again.

hotwaterwizard

Silver - Posts: 1,350

Joined: December 11, 2003

Location: California, United States

Posted: April 14, 2006 at 8:26 AM / IP Logged

This is a one shot as far as I know.

I tried the circuit out and it works as a one shot.

Otherwize they would call it a flasher.

It 's okay to think something so simple won't work.

Einstein had the same problem. Relay To Replicate Momentary Switch -- posted image.

John DeRosa (Hotwaterwizard)

Stockton California

When in doubt, try it out !

W3bma5t3r

Member - Posts: 6

Joined: June 27, 2004

Location: United States

Posted: April 14, 2006 at 2:09 PM / IP Logged

alrighty, I'll give it a try. One additional question, that is a diode across 86/85 right? which diode should be used for that? Thanks again, I greatly appreciate it.

hotwaterwizard

Silver - Posts: 1,350

Joined: December 11, 2003

Location: California, United States

Posted: April 14, 2006 at 6:50 PM / IP Logged

Just about any 3 amp switching diode will work 1N2003, 1N2004 for example

John DeRosa (Hotwaterwizard)

Stockton California

When in doubt, try it out !

W3bma5t3r

Member - Posts: 6

Joined: June 27, 2004

Location: United States

Posted: April 25, 2006 at 10:01 PM / IP Logged

Just wanted to say thanks. The relay, capacitor/resistor method worked perfectly. :-)

The results

hotwaterwizard

Silver - Posts: 1,350

Joined: December 11, 2003

Location: California, United States

Posted: April 25, 2006 at 10:33 PM / IP Logged

NICE JOB

Relay To Replicate Momentary Switch -- posted image.

John DeRosa (Hotwaterwizard)

Stockton California

When in doubt, try it out !

Next Page >

Printable version

You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot delete your posts in this forum
You cannot edit your posts in this forum
You cannot create polls in this forum
You cannot vote in polls in this forum

Search the12volt.com

Follow the12volt.com

Disclaimer: *All information on this site ( the12volt.com ) is provided "as is" without any warranty of any kind, either expressed or implied, including but not limited to fitness for a particular use. Any user assumes the entire risk as to the accuracy and use of this information. Please verify all wire colors and diagrams before applying any information.