If I wanted to make a USB desk fan from a spare CPU fan (input: 12V, 0.15A), could I just solder a resistor to the positive lead of the USB wire? I plan on getting an adjustable voltage booster, but I was curious if this was possible. I think I would need a 13 ohm resistor for USB 3.0.
1 point
I try to shy away from recommending anything that’s not explicitly called out in a standard for that reason… quite a lot of chargers or PC motherboards do support both QC and USB-PD, but many also don’t, and you’ll always land on the wrong side of Murphy’s Law trying to rely on manufacturers supporting both.