Momentary output with maintained input

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djreiswig

Member - Posts: 41

Joined: December 07, 2004

Location: United States

Posted: January 11, 2006 at 3:15 PM / IP Logged

I need a circuit that will take a maintained ground input and provide a momentary (less than one second) ground output. It would need to reset and provide the output once the ground input goes away and comes back again.

This will be used to disarm a factory alarm system without unlocking the doors. That is why it needs to be a short pulse.

KPierson

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Joined: April 14, 2005

Location: Ohio, United States

Posted: January 11, 2006 at 5:49 PM / IP Logged

Are you looking for a circuit to build yourself or a commercially availible product?

Kevin Pierson

djreiswig

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Joined: December 07, 2004

Location: United States

Posted: January 11, 2006 at 6:13 PM / IP Logged

Would like to build myself if possible/practical.

KPierson

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Location: Ohio, United States

Posted: January 11, 2006 at 7:18 PM / IP Logged

A pulse timer should work for this without a problem, there are several ways to build pulse timers.

Kevin Pierson

djreiswig

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Joined: December 07, 2004

Location: United States

Posted: January 11, 2006 at 11:20 PM / IP Logged

What would be the best way with common components? Would the time be adjustable with a resistor or something?

KPierson

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Joined: April 14, 2005

Location: Ohio, United States

Posted: January 12, 2006 at 6:37 AM / IP Logged

Should be able to do it with a 555timer and an RC circuit. For the R you can use an adjustable potentiometer to adjust the time of the pulse

Kevin Pierson

djreiswig

Member - Posts: 41

Joined: December 07, 2004

Location: United States

Posted: January 12, 2006 at 6:53 AM / IP Logged

Could you come up with a circuit for me? I can build it, but I don't know how to design it. I don't do much electronic stuff.

KPierson

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Location: Ohio, United States

Posted: January 12, 2006 at 2:02 PM / IP Logged

http://home.cogeco.ca/~rpaisley4/LM555Basics.GIF

Taken from: http://home.cogeco.ca/~rpaisley4/LM555.html

You would want the last circuit shown, a one second one shot.

You want me to come install it for you, too? :)

Kevin Pierson

KPierson

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Joined: April 14, 2005

Location: Ohio, United States

Posted: January 12, 2006 at 2:03 PM / IP Logged

I didn't think ti would show up, the file neds in .GIF, and I've never gotten an uppercase extension to work on this site...

Kevin Pierson

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Posted: January 12, 2006 at 2:09 PM / IP Logged

KPierson, the file extention was missing in your first post.

Momentary output with maintained input -- posted image.

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