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Double PWM-fan (4 pin) controller | PCB Design

Double PWM-fan (4 pin) controller
Version 1 - Last update: Oct 26, 2015

A double square wave generator controlling two 4pin fans. Basically NE556 IC is two NE555 in the same package. The potentiometer changes the wave duty cycle so that the fan can spin slower or faster.
IT DOES NOT NEED any transistor! PWM fans are powered by a separated 12V line; the square wave simply control rotation.

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