William Noble wrote:
consider a 7805 regulator

this will give you nice stable 5VDC at up to 3 amps





The 78xx series are only up to one amp depending on packaging.
http://www.fairchildsemi.com/pf/LM/LM7805.html

Try LM350 adjustable regulator - Guaranteed 3 amps.
http://www.national.com/mpf/LM/LM350.html (with sechematic)

Richard