Ask Electronics

3173 readers

3 users here now

For questions about component-level electronic circuits, tools and equipment.

Rules

1: Be nice.

2: Be on-topic (eg: Electronic, not electrical).

3: No commercial stuff, buying, selling or valuations.

4: Be safe.

founded 1 year ago

MODERATORS

[email protected]

Making a USB desk fan from spare CPU fan (lemmy.world)

submitted 1 year ago by [email protected] to c/[email protected]

11 comments fedilink hide all child comments

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.

you are viewing a single comment's thread
view the rest of the comments

[–] [email protected] 1 points 1 year ago (1 children)

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.

[–] [email protected] 2 points 1 year ago* (last edited 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