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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: www.electroboom...
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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.
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By: Mehdi Sadaghdar