Is this at all possible?
- merely powered by it; or
- some driver compiled/installed that the speed can be controlled?
If merely powered, you need a variable capacitor (if my circuity study is not rusty at the moment). Then I assume you want to control it too, you'll need some driver/software or a network controllable one....
Doesn't seem feasible to me.
Thanks for reply.
merely powered by it...
would it be feasible to control the output power of a certain usbport to lower rpm?
That's the circuit that I mentioned you have to build/install - to control the power at the USB port going thru onward to the fan's wiring.
(Some devices switch power on and off using a method; but given your fan works now, I assume power in your ports are always-on. "Off" in theory may provide a few milliamps of current - that's why I mentioned it.)
Got a tip of where to start?
I'd wouldn't struggle with that, I'd use one from AC or based on 12V anyways...which reminds me...you didn't note the rated voltage/amps of the fan, so these devices may or may not apply to you in particular:
- https://smile.amazon.com/DC-DC-Supply-Module-Voltage-Converter/dp/B07V3L4YF3 - or
(Also, forgive me if I'm mixsed amps/volts/etc. this morning, no coffee yet.)