Author Topic: Help with 12v 4pin PWM fan  (Read 1218 times)

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Offline happirtTopic starter

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Help with 12v 4pin PWM fan
« on: August 22, 2018, 10:25:47 am »
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?
 

Offline PTR_1275

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Re: Help with 12v 4pin PWM fan
« Reply #1 on: August 22, 2018, 10:28:56 am »
Is that PWM module switching ground instead of switching positive? Any data sheets on that module?
 

Offline happirtTopic starter

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Re: Help with 12v 4pin PWM fan
« Reply #2 on: August 22, 2018, 10:38:52 am »
unfortunately no diagram, but YES it sounds like it is switching positive instead of ground, what can I do??
 

Offline happirtTopic starter

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Re: Help with 12v 4pin PWM fan
« Reply #3 on: August 22, 2018, 10:44:26 am »
will this switch ground or positive?

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

Offline PTR_1275

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Re: Help with 12v 4pin PWM fan
« Reply #4 on: August 22, 2018, 11:13:44 am »
That’s switching negative.
 

Offline happirtTopic starter

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  • Country: au
Re: Help with 12v 4pin PWM fan
« Reply #5 on: August 22, 2018, 11:22:27 am »
Is there a way to use it with my application?
 


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