Lots of motor control info. It is easier to use than trying to build the h-bridge using individual transistors. If the motor is going to change directions often, you may want to purchase a heat sink for the chip. The current through the motors increases dramatically when they have to stop and reverse direction, making the chip heat up. These are the same size as L293 and are good for 1.2A and 2.0A respectively.
Speed control is analogue.
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