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.

  • empireOfLove@lemmy.one
    link
    fedilink
    English
    arrow-up
    1
    ·
    1 year ago

    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.

    • human_no_4815162342
      link
      fedilink
      English
      arrow-up
      2
      ·
      edit-2
      1 year ago

      That’s not what I was saying, PD included 12v up to 2.0 (I am going from memory) so it’s not multi standard support but retrocompatibility from modern PD to the older version

      Edit: I checked and the requirement was removed from rev 1 to rev 2 so now it’s optional