Simple voltage limiter
I recently added a 180MM computer muffin fan to my intake window. The fan, a silverstone FM181 which employs a variable speed 10k ohm potentiometer, has an operating voltage from 5v to 13.2v. ht...
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A 7809 regulator is about the easiest way to go. Dirt cheap. Mount it with ADHESIVE thermal compound to a metal surface. Good for 30 volts input. At nine volts this fan should be comfortable. A two dollar investment.
