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I want to make my harddisk motor running but when I tried to give it voltage on different pins it jerks and stop I came to know it runs on continuous pulse.

How can I make it run by external voltage?

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up vote 3 down vote accepted

Oh you're in for a treat! Some four-pin motors, 555 timers, et. al. These should get you started: http://letsmakerobots.com/node/2898, BLDC controller, and Drive stepper-motors. Best of luck to you!

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