I'm gettting pretty excited with picaxe and want to start building circuits to control gadgets in my car. So, picaxe circuits all seem to run with 4x1.5 volts batteries ( 6 volts). I want to run them in my car: 12 volts. what is the best solution, and the simplest? (i tought about using those car cellphone chargers that convert 1v to 5.5v, but there is gotta be a better way, right?