Yes, and thanks :)
One thing i noticed. You mentioned earlier in this thread that 4-pin fans probably have some logic built in to detect whether a PWM signal is present, and behave accordingly. I replied that i might revisit that later once i have something that works. Luckily it turns out...
Update:
It works!
The circuit above is mostly wrong, and some quantities are off by orders of magnitude because i didn't read them correctly. Also i solved the problem of the voltage regulation being dependent on the load and capacitances, it now works with a variety of loads (down to ~12...
I've had some fun in a simulator and i think i've come up with something one could call a design. It's probably not good by a long shot and some of the chosen quantities may be weird, but that's because those are just parts that i have.
I haven't built it yet, but have already scavenged all...
Thank you for the detailed explanation! It is really helpful.
I was wondering about that as well. If i take no consideration for the case where the PWM signal might be absent, my converter wouldn't work if i plugged it into a 3-pin header. Then there's also the question about the minimum...
I know you can plug 3-pin fans into 4-pin headers, this is about getting fan speed control on 3-pin fans with no bios/hardware support for regulating their voltage. I've got dead mobos and PSUs to source parts from, and time to tinker with the idea. I have no background in electronic engineering...
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