Electronics > Beginners

Help with 12v 4pin PWM fan

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happirt:
I am trying to setup a 12v 4pin fan with a potentiometer to regulate the speed. This is not for a PC so I don't have a motherboard, instead just a 12v battery and a NE555 timer based PWM controller.



My problem is when the green colored ground connection from PWM controller OUT to common ground is connected the PWM is sending a constant 12v not pulsing as it should. What is wrong here?

PTR_1275:
Is that PWM module switching ground instead of switching positive? Any data sheets on that module?

happirt:
unfortunately no diagram, but YES it sounds like it is switching positive instead of ground, what can I do??

happirt:
will this switch ground or positive?

https://diyodemag.com/_images/5a8bb4a6c672e0a73df42bcf

PTR_1275:
That’s switching negative.

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