Remember that cheap CPU cooler that i got in the last mailbag? I wanted to do some experiments and see if I could control it with a nice simple old-school 555.

Here are the references I mentioned in the video:

https://www.electronicshub.org/555-timer-pwm/

https://www.noctua.at/pub/media/wysiwyg/Noctua_PWM_specifications_white_paper.pdf

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This isn't the only way to do it. It's probably not the best way to do it. But it's how I did it.