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Module 6: Applications

20252m

Interfacing a DC motor generally requires

(i) Driver circuit
(ii) Counter
(iii) Keyboard
(iv) Crystal oscillator

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Answer: (i) Driver circuit

Explanation: 8051 I/O pins source/sink only ~mA, insufficient for DC motor (hundreds of mA, inductive). Interfacing requires driver circuit (transistor, MOSFET, L293D/L298 motor driver IC) plus flyback diode, not counter/keyboard/crystal.

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