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WHY: Because you can control both speed and direction of a motor at once... everything you need for forward/backward motion.
L293 quadruple half H-Bridgehttp://focus.ti.com/lit/ds/symlink/l293.pdf:
[[Image:Bidirectional_control.png]]
[[Image:Bidirectional_motor_photo.jpg|300px]] [[Image:Bidirectional_motor_detail.jpg|300px]]