[LAU] [OT] 8-port USB hub

Ralf Mardorf ralf.mardorf at alice-dsl.net
Mon Jan 21 09:11:09 CET 2019

On Mon, 21 Jan 2019 08:48:07 +0100, Ralf Mardorf wrote:
>On Sun, 2019-01-20 at 15:35 -0800, Ace Path wrote:
>> If you desolder the 5v pin from the usb cable on the usb hub, it will
>> no longer be powered by your computers usb port, but can still
>> communicate with it (keep the gnd connected!). Then you can either
>> solder on a port or a wire(I used a wire since i dont have many micro
>> USB ports on hand which I would have preferred, and connect it to a
>> power bank. Woila! Rechargeable battery powered usb hub in 5
>> minutes  
>Don't try this at home!
>Usually active 4-port USB hubs are inexpensive, too and they usually
>could be used as an active or passive USB hub, without the need of a
>switch to connect or disconnect +5V aka VCC aka VBUS coming from the
>computer. Instead of cutting of the connection from the computer's
>power, a diode might do the trick. OTOH a diode, such as a 1N4007 drops
>the voltage, which could become an issue. However, your solution with
>the cut off power still requires a wall wart with proper regulation, or
>you anyway at least need to add a 5.1V Zener diode, since adding a
>voltage regulator could be tricky, too.
>In the end DIY is time consuming and is asking for trouble. You
>probably won't damage your hardware, but much likely the DIY thingy
>won't do the job in all (or at least most) cases. Better buy a cheap
>active USB hub that was tested to work in all (or at least most) cases
>by a computer magazine, such as the  

I missed that you are using a battery instead of a wall wart, so
voltage regulation doesn't matter. It's still not worth the effort.

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