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PWM control for a 3-pin fan

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  3. PWM control for a 3-pin fan
Thread replies: 5
Thread images: 1

Anonymous
PWM control for a 3-pin fan 2017-03-05 11:49:11 Post No. 59247947
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File: PWM to 3-pin.jpg (16KB, 465x339px) Image search: [Google]
PWM to 3-pin.jpg
16KB, 465x339px
PWM control for a 3-pin fan Anonymous 2017-03-05 11:49:11 Post No. 59247947 [Report]
I have a couple of 3-pin fans in my computer an I'm annoyed that they are always running at full speed as my Mainboard doesn't have voltage control.

After a bit of search I found this simple circuit that uses the motherboards PWM signal to switch the fan on/off using a MOSFET, which seems reasonable to me.

Simple enough, I could probably build that for 1-2€, but am I missing something here?

I mean what does this much more complex circuit [1] to instead, when the same thing could be achieved with only 3 parts?

[1] http://www.aquatuning.de/wasserkuehlung/ueberwachung/steuergeraete/20355/phobya-4pin-pwm-auf-3pin-transformer-single
>>
Anonymous 2017-03-05 11:51:09 Post No.59247956
[Report]
Anonymous 2017-03-05 11:51:09 Post No.59247956 [Report]
just add a resistor and make it run at a lower voltage

few degrees plus minus dont change much
>>
Anonymous 2017-03-05 11:51:24 Post No.59247960
[Report]
Anonymous 2017-03-05 11:51:24 Post No.59247960 [Report]
>>59247947
/g/ doesn't know shit about actual electronics. Try >>>/diy/ instead.
You might get a reply here if you're lucky.
>>
Anonymous 2017-03-05 11:53:19 Post No.59247972
[Report]
Anonymous 2017-03-05 11:53:19 Post No.59247972 [Report]
>>59247947
your circuit still outputs PWM and that's not how BLCDs want to get driven
>>
Anonymous 2017-03-05 12:00:50 Post No.59248010
[Report]
Anonymous 2017-03-05 12:00:50 Post No.59248010 [Report]
>>59247972
What is it that they would not like about it?
Thread posts: 5
Thread images: 1
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