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timer to reverse shut off circuit when key is removed from car

eman

May 10, 2012
2
Joined
May 10, 2012
Messages
2
Hello,

I would like to build a timed circuit that will provide -12V to an actuator when the key is removed from my car ignition.

When the key is turned to ACC on the car, I can get a constant 12V, but when I remove the key, I need to know if I can either purchase or make a circuit which will reverse the polarity to
-12V for about 5 seconds and then shutoff.

Any ideas?
 

eman

May 10, 2012
2
Joined
May 10, 2012
Messages
2
Thanks for the response Green Giant (Jolly?). According to the linear actuator I wish to purchase, I will need +12v to extend the arm and -12V to retract it. I have some ideas, but rather get some advise and possible some diagrams before I spend countless hours on this thing. Any help is greatly appreciated.
 
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