Usb Powered cpu fan
Usb Powered cpu fan
There's more to it than just making sure the wires are connected correctly. CPU fans are typically powered by up to 12V, while USB is only 5 V. It's possible the fan may not even start at that voltage. You may also want to check the current rating of the CPU fan, to make sure it doesn't exceed 500 or 900 mA (max current for a USB 2.0 and 3.0 port, respectively). I don't think a CPU fan should draw that much though.
Naipross :
Everything seems to be in order after connecting the black wire to the black and red to red. It sounds correct. Be sure to insulate all unused wires. Double-check that nothing is shorted—definitely avoid letting your Vbus (red) touch the GND (black). Consider using a DMM or multimeter for a continuity test if you're not sure. If everything checks out, you're good to proceed.
There's more to it than just making sure the wires are connected correctly. CPU fans are typically powered by up to 12V, while USB is only 5 V. It's possible the fan may not even start at that voltage. You may also want to check the current rating of the CPU fan, to make sure it doesn't exceed 500 or 900 mA (max current for a USB 2.0 and 3.0 port, respectively). I don't think a CPU fan should draw that much though.
TJ Hooker :
There's more to it than just making sure the wires are connected correctly. CPU fans are typically powered by up to 12V, while USB is only 5 V. It's possible the fan may not even start at that voltage. You may also want to check the current rating of the CPU fan, to make sure it doesn't exceed 500 or 900 mA (max current for a USB 2.0 and 3.0 port, respectively). I don't think a CPU fan should draw that much though.
That is a good point to consider, however since OP implied using a 2 pin fan I did not consider it. Have not seen a 2 pin fan requiring more than 5V 500mA
Yes, in the sense that it's unlikely the fan would draw more than the USB port could source and damage it. I think there's a definite possibility the fan simply won't start, but you wouldn't damage anything. And in that case you may even be able to get it started by giving the fan a flick with your finger to get it going.