Originally Posted by Dave H

No, a power supply is not required. It can be used either way actually, plugged directly into a wall socket, or with a power supply. (Just be sure to use the proper inputs of course.)

They also have a newer version that has more power, which if nice if you are running electrics, especially E 1/8 or something similar (Probably overkill for a nitro). This one can produce higher power on a DC power supply (150 watts), but still works without, plugged directly in to an AC wall plug (90 watts):

http://www.amainhobbies.com/product_...er-7S-20A-150W