I agree with Emu&Co I would try it with a power supply. You can get one that works from Radio Shack. The one I picked up was Cat. No. 273-1680. I can't remember what I paid for it but it comes with like 6 diff. tips, 1 amp and can select 3, 4.5, 6, 9, and 12 volts. I use mine all the time...