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A comment on Built a cheap DIY fan controller because my motherboard never had working PWM. Parent comment

Re:Built a cheap DIY fan controller because my motherboard n... by haktan on Thursday April 02, 2026 @06:17AM (#47612372)
Could you use an audio out port for creating the signal and ditch the Arduino?
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Re:Built a cheap DIY fan controller because my motherboard n... by magicalhippo on Thursday April 02, 2026 @06:54AM (#47612636)
That might work for the PWM signal, however you'd still need some electronics as the fan has internal pull-up to 5V and expects it to be pulled low by the PWM signal.

But a small circuit with a Schmitt-trigger inverter IC and some resistors and capacitors might do the trick, for example.

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Re:Built a cheap DIY fan controller because my motherboard n... by bobsterlobster on Thursday April 02, 2026 @08:03PM (#47621816)
Interesting idea, I'll look into it.
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