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Old 11-03-2014, 11:13 PM
Location: Denver
3,139 posts, read 6,903,098 times
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I have a switch I want to use in my car. It is an OEM switch but it is a momentary switch. I want to use the switch to turn fog lights on and off. I know I could get a switch that latches on and off at Radio Shack but this OEM momentary switch looks a lot better.

How would I do this? Some sort of timing circuit?


I saw this on Amazon and it is in the right direction....I just don't want the output turned off 10 seconds later.

I got the idea here :
[Mk4 Golf] Modifications for the 2.0 8V - Engine, Tuning and Performance - uk-mkivs ... in the picture he describes a timing circuit.
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Old 11-04-2014, 07:47 AM
701 posts, read 887,513 times
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You want it to stay on for a finite amount of time, then turn itself off? Will a Delay on Break Relay do what you want?

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Old 11-04-2014, 10:28 AM
389 posts, read 450,432 times
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I don't know of any mechanical device. But you could build one using TTL. A 12 V quad NAND would work. Output of the 4011 to a NPN transistor. Transistor to a diode protected relay. Relay to fog lights.
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