Wiring 3 or 4 wire computer fans explained. of course all you need is the red and black wire to run your computer fan, but if you didn't know what the extra wires are for, this video may help you out. This demonstration shows the effects of adding the blue wire to a potentiometer and tach meter to deviate in between the two default fan speeds of max and low. If you like it or found it useful Like the video! Thanks for watching.
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