momentary to constant with 1s delay

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baboonia

Member - Posts: 3

Joined: May 27, 2007

Location: Canada

Posted: May 19, 2010 at 11:30 AM / IP Logged

I need to trigger a relay with a momentary ground pulse that will keep the relay energized for just 1 or 2 seconds...., then do nothing until the next ground pulse.

Is there an easy way to do this using just a relay/capacitor/resistor/diodes?

A diagram would be helpful. None of the standard drawings cover my exact application.

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hotwaterwizard

Silver - Posts: 1,350

Joined: December 11, 2003

Location: California, United States

Posted: May 22, 2010 at 12:11 AM / IP Logged

https://www.the12volt.com/relays/relaydiagram43.html

momentary to constant with 1s delay - Last Post -- posted image.

Just use a bigger capacitor

John DeRosa (Hotwaterwizard)

Stockton California

When in doubt, try it out !

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i am an idiot

Platinum - Posts: 13,670

This member consistently provides reliable information

Joined: September 21, 2006

Location: Louisiana, United States

Posted: May 22, 2010 at 6:27 AM / IP Logged

How much current capacity does your momentary trigger provide. If it is capable of charging a 4700 microfarad capacitor, you can easily do this with the cap mentioned and a diode. If your output is from some kind of controller, you may need to add a transistor, but still easily done.

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dualsport

Silver - Posts: 983

Joined: September 27, 2005

Location: United States

Posted: May 22, 2010 at 2:59 PM / IP Logged

Sounds like he's looking to stretch a momentary input pulse, not applying a constant input, e.g. 100ms pulse input to a 2 second relay closure per pulse.

It'd need a driver circuit to implement if so, a relays only setup won't do.

Prior post with a similar requirement.

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momentary to constant with 1s delay

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