In a single L293D chip there are two h-Bridge circuit inside the IC which can rotate two dc motor independently. As you know voltage need to change its direction for being able to rotate the motor in clockwise or anticlockwise direction, Hence H-bridge IC are ideal for driving a DC motor. H-bridge is a circuit which allows the voltage to be flown in either direction. You can find the necessary pin diagram, working, a circuit diagram, Logic description and Project as you read through. You can Buy L293D IC in any electronic shop very easily and it costs around 70 Rupees (INR) or around 1 $ Dollar (approx Cost) or even lesser cost. The l293d can drive small and quiet big motors as well, check the Voltage Specification at the end of this page for more info. Dual H-bridge Motor Driver integrated circuit ( IC). It means that you can control two DC motor with a single L293D IC. L293D is a 16-pin IC which can control a set of two DC motors simultaneously in any direction. L293D is a typical Motor driver or Motor Driver IC which allows DC motor to drive on either direction.
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