I have a wireless air mouse that I would like to recharge inside the car. The problem is that the mouse is 6vcd. I can'nt use the 12v rail of my power supply because the voltage is 12v not 6v. the 5v rail is not enough. So how can I get the 12v down near 6v? what parts can I use to make this happen. I went to radio shack, they coulnt tell me how to resist the voltage. please someone help!!!