this post was submitted on 14 Dec 2023
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Soldering

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Whats stopping me from doing this? (lemmy.ohaa.xyz)
submitted 10 months ago by [email protected] to c/[email protected]
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I recently got this cheap USB dac thats plugged into my pc over USB - B but it still needs Micro USB power for some reason. So I thought I could just connect the 5V from the USB A port to the Micro usb's. Is there any reason why this doesn't work?

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[–] Mandarbmax 6 points 10 months ago (1 children)

It might draw too much power for a single pc USB port to handle reliably. Trying what you suggest probably will not damage anything so give it a try and if it doesn't work just remove the jumpers and use it as it was designed.

[–] [email protected] 2 points 10 months ago* (last edited 10 months ago) (2 children)

thanks. Max USB A current is 500mA, right?

[–] [email protected] 2 points 8 months ago* (last edited 8 months ago) (1 children)

The specified currents are:

  • USB 2.0 is 500mA,
  • USB 3.0 is 900mA

Since most USB hubs in PCs are USB 3, you can guess that they can push 900 mA regardless. Also, PCs are using internal USB hubs nowadays and often they don't regulate a single USB outlet but the cumulated power the hub is pushing. This isn't necessarily safe, but this makes a couple of hubs capable of pushing 1000mA or even more on a single outlet, even though it is not specified this way.

All in all: You could be fine by doing this, depending on the overall power draw of your device. But probably working on a USB 3 port.

[–] [email protected] 1 points 8 months ago

thanks

[–] Mandarbmax 1 points 10 months ago

I don't know off hand but that sounds about right.