light on timer
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=14489
Printed Date: May 27, 2025 at 1:52 PM
Topic: light on timer
Posted By: bousdula
Subject: light on timer
Date Posted: June 05, 2003 at 12:13 AM
I am installing a Push Button Starter, and want the light in the button ( has it's own + & - connection ) to turn on for about 15 seconds when I put the ignition in the start postion. But if the car is started before the 15 seconds, I want the light to turn off. thanks
Replies:
Posted By: auex
Date Posted: June 06, 2003 at 6:16 PM
You could use a pulse timer for this application, or you could test with a relay and some caps.
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Posted By: bousdula
Date Posted: June 08, 2003 at 8:13 PM
umm, I'm not that advanced with electrical set ups. Could you explain in more detail. -------------
Posted By: xetmes
Date Posted: June 08, 2003 at 8:40 PM
you could base it around this: 
Posted By: bousdula
Date Posted: June 09, 2003 at 12:22 AM
that looks cool, about how long would the "momentary 12v output" be on?
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Posted By: xetmes
Date Posted: June 09, 2003 at 6:37 AM
The author says about 1/2 a second, hmmm i guess thats not too close to 15 lol... you could increase the cap value for a longer on time, but it might be a bit too large to get the desired effect. If you want i will do it using a 555 timer, then you can adjust from 1 second to 30 seconds what you want.. let me know.
Posted By: bousdula
Date Posted: June 09, 2003 at 9:43 AM
I don't know what a 555 timer is, but up to 30 seconds would be better than 1/2 a second. If you could explain it that way, I would appreciate it. -------------
Posted By: xetmes
Date Posted: June 09, 2003 at 8:07 PM
here is what i came up with, by adjusting the pot you can have between 0 seconds and 111 seconds. 
Posted By: bousdula
Date Posted: June 10, 2003 at 6:46 PM
nice diagram. Thanks for all the help -------------
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