Just bought a new Helix 7 and now it's winter. Too cold in the garage to play with it. Is there an AC to DC adapter that I can use (safely) so I can sit in my easy chair and play around with the unit to get familiar with it. Then I can have the manual sitting next to me to check out all the gizmos. I know the adapter would have to be 12 volts, but what about amps? Any help would be appreciated.