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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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@oKtosiTe Please do not moderator flag for spelling corrections etc. Moderator flags are used where intervention is required by a diamond moderator, which cannot be handled by a community moderator. Since all 3K users can edit post, spelling etc is handled by them. – Diago Dec 13 '10 at 11:42
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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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