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Is it possible to power a powered usb hub off of computer power supply?

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Popcorrin:


--- Quote from: Franco B on August 22, 2008, 06:06:17 am ---If you are running two LED WIZ's as well as 5 other devices from one USB port (via the 7 port hub) you will more than likely exceed the 500 mA.

All you need to do is feed the LED Wiz'z 5v from your PSU and they will take power from that which will free up the USBs power for the other devices.



--- End quote ---

I'll be running 5 volts from the ps to the led-wizs but I still want to run 5 volts to the powered usb hub just to be safe and to make sure all the devices get the power they need.

Shieldwolf:

not to derail, but is there a ledwiz document for dummies and power?



Teebor:


--- Quote from: Popcorrin on August 21, 2008, 04:47:17 pm ---I was thinking about powering my usb hub from a 5v line of my power supply.  The hub requires 4 amps at 5 volts.  I couldn't think of any issues with this but I wanted to check to be sure.   

--- End quote ---

Yes you could do this, and it should work fine (assuming you get the wiring round the right way, not like I do sometimes :D hehe)

To answer the other questions, if you have a passive hub (draws its power from the usb port) you do not get the full 500ma delivered to each port on the hub, you get slightly less and this is enough to stop some devices working (usb hdd, dsl modems, etc)

Providing additional power through an external power source to an inlet jack as is available on self powered hubs you provide the full 500ma to each port and do not suffer the same problems.

Not so much a big a deal these days but it is handy, a few years back I think VIA had a chipset that if you tried to draw the full 500ma direct from the port the USB ports on the machine shutdown and would not start working again until you reboot.

MrMojoZ:

My Xbox 360 wireless controller receiver won't work when I also have my G15 Keyboard plugged into my PC, a powered USB hub solves the problem.  :applaud:

vertygo:

Just thought of this thread when I came across this..

molex powered usb hub - $7.99 (SYBA)

Just in case anyone else was looking for it :)

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