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Power Adapter for USB Hub

  • Power Adapter
  • USB
  • Power
  • Components
Last response: in Components
September 8, 2010 12:48:14 AM


Couple of months ago, I bought a 4 Port powered USB hub from the local Microcenter, however it didn't come with a power adapter. The power receptacle is labeled:

4 Port USB 2.0 Hub
Input: DC 5.0V, 500 - 1000MA
Rated Power: 2.5W DC5.0V

It is pretty much like the one found at the following site:

The only reasonably priced power adapter I could find was Vohnk AC Adapter from monoprice:

Input: 100-240V 50/60Hz 0.4A
Output: 5V 2.0A

Since the adapter is providing more power than required by the hub, could this flood the USB bus with feedback power and damage my mother board? Any help is appreciated.


More about : power adapter usb hub

September 8, 2010 12:54:24 AM

It should be fine just make sure you get the polarity right or you could fry the hub.
September 15, 2010 7:28:47 AM

How would I check if the polarity is right, do I need a multi-meter? This adapter doesn't have a ground terminal and both the positive and negative terminals are the same size(width wise), so it can be plugged in two different ways.
December 21, 2014 7:05:39 PM

Most of the USB hubs that I have come across are 5V POSITIVE polarity, i.e. the center tip is positive.

If you are using a multimeter, place the positive lead (usually red color) on the center pin of the DC input. Place the ground lead (usually black in color) on any metallic surface of the hub. If the reading shows positive value, then the DC input is POSITIVE polarity.