Momentary contact during power On and Off.

Thread Starter

sangeetk

Joined May 27, 2009
3
I am new to this forum and my knowledge about electronics is very basic. I am planning to add a laptop in my car which will be used as a carputer.

My requirement is to make momentary contacts for the power switch both during the power (12 VDC) ON and OFF (to switch on and switch off the laptop).

I am able to find some circuit diagram which gives momentary contact during power on in the following link
http://www.the12volt.com/relays/page5.asp

But not able to find something which also gives momentary contact during power OFF.

Any help will be really appreciated.
 
Last edited:

KMoffett

Joined Dec 19, 2007
2,918
Sure. That's just what I had used to get a long pulse period. The length of the pulse depends on the size of the capacitor and the resistance of the relay coil...mostly. About C (in farads) x R (in ohms) = T (in seconds).

Ken
 
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