Ok i understand what your saying i think... Pulse modulation is a pulsating current that lowers the amount of power a motor uses right? And why cant i get transistors that work in the voltage range of 5 volts? And what your saying about getting them for cheap is true i ordered one of these off ebay >>>

http://www.ebay.com/itm/320A-Brushed...item46014ffb29

Just hoping it can push 2 550 motors with out any problems.
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