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 Follow me on Facebook: http://www.facebook.com/ElectroBOOM Follow me on Twitter: https://twitter.com/ElectroBOOMGuy 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: https://www.youtube.com/watch?v=09y8Wx-CbJQ By: Mehdi Sadaghdar