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Frequently those of us who make animatronic figures or play with motors and what-have-you need to power these devices. I mainly use DC motors from cars and servos. My motor of choice is the venerable windshield wiper motor. To power such a beast I always go back to the ATX power supply which can be found inexpensively or free.
Scary Terry has some great information about using a PC power supply to power DC motors on his website. The benefit of using a PC power supply to power your motor is that most of the time you can alter the speed of the motor by altering the amount of voltage you send to it, and the PC power supply has several different voltage outputs.
Another cool thing you can do is turn a PC power supply into a sort of lab power supply. As seen here on wikiHow
As always be careful.
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