BabyGeezer:
oh - you mean like phone chargers that plug into the mains AC ?
No, I meant a USB phone charger that plugs into the cigarette lighter hole in the dashboard of a car.
You just asked for a 12>5volt/1A regulator.
A 5volt/1A phone/tablet USB supply is ofcourse an easy way to get 5volt/1A.
Leo..