VTech Alphabert s Magic Readport User Manual download pdf (Page 68)

Lab Manual of Microcontroller & Interfacing Page 68

H-bridge is available in single IC form such as L293. Four transistors are inbuilt in this

IC. This IC produces heat during the operation, hence it requires heat sink for continuous

operation. Interfacing of H-bridge IC with microcontroller using Quad optocoupler IC ILQ74 is

shown in the following Circuit diagram. Quad optocoupler IC has four in-built optocoupler

which provides optical isolation between H-bridge circuit and microcontroller 89C51. Separate

power supply can be used for microcontroller and motor circuit.

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VTech Alphabert s Magic Readport User Manual Page 68