Here's a way to make an electric toothbrush. But mostly, a good way to speed control of a DC motor by PWMing the motor.
For more design details, please see: http://www.electroboom.com/?p=359
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By the way, if you want this circuit or similar ones as a kit or complete unit, send me an email to mehdi@electroboom.com . I want to know how many people are interested.

Ray William Johnson's video: http://www.youtube.com/watch?v=09y8Wx-CbJQ&feature=share&list=SP6A40AB04892E2A1F

By: Mehdi Sadaghdar