Ha! Funny timing
I literally just bought a cheap 7 port usb hub off ebay and then wired it to be powered externally by a powerbank (I use a 10000 mah 2.4 amp anker that works more than sufficiently for my purposes, and assuming your midi devices arent drawing crazy amounts of power that should be good for you too)
I got the idea from external harddrives that have y splitter cables
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
Note: some powerbanks have auto shutoffs if not enough current is drawn. My power bank uses leds and the lights were enough to keep it on without any issues.
I also forgot, i wanted to put a switch in so I could still the hub to connect (fewer devices) but still use my laptops usb power, so I dont already need the power bank.
I'll bring it to dorkbot tomorrow and do that there if you want to see it in person! Otherwise heres a simple instructions that you can modify if you want to use a powerbank like me
I couldnt confirm this but based on my raspberry pi usage in the past, should be safe to use most powerbanks as my assumption is that they are regulated power supplies. Anyone else with any insights id be glad to hear if theres an unforeseen potential danger here but worst case scenario is you dont get quite enough power to all of your devices
Best of luck
Athan
On Sun, Jan 20, 2019, 8:37 AM Ralf Mardorf <ralf.mardorf@xxxxxxxxxxxxx wrote:
On Sun, 20 Jan 2019 15:47:26 +0100 (CET), Jeanette C. wrote:
>8-port USB hub
Reichelt sells an active 10-Port and 28-Port USB hub. What you order on
Monday morning usually gets delivered at Tuesday. Within 14 days you
could test it and return it for free, if it shouldn't satisfy you. You
would get the money back for the USB hub, but not the 5,60 € shipping
cost.
10-Port
English
https://www.reichelt.com/de/en/delock-usb-2-0-10-port-hub-2-0-with-power-supply-unit-delock-61857-p108800.html?&trstct=pol_7
German
https://www.reichelt.com/de/de/de/en/delock-usb-2-0-10-port-hub-2-0-mit-netzteil-delock-61857-p108800.html?GROUPID=6906&START=0&OFFSET=16&SID=96XESdZKwQAT4AAGdwyYs8f6e0329ee2f1322451f945bbed4625a&&r=1
28-Port
English
https://www.reichelt.com/de/en/de/de/28-port-usb-3-0-2-0-hub-man-163606-p217630.html?GROUPID=6906&START=0&OFFSET=16&SID=93XESZ7awQAT8AAHHDn5U137ef639494fefb66d60bed863402783&&r=1
German
https://www.reichelt.com/de/de/28-port-usb-3-0-2-0-hub-mit-netzteil-man-163606-p217630.html?&trstct=pos_1
I don't have experiences with such a hub, I only plan to use a cheap,
but good active 4-Port USB hub, to only connect one device to it,
since my new computer can't power a Korg nanoKontrol with a 3 m USB
cable. My old computer had no issues doing it. Originally I used it to
connect a Presonus audio interface to an iPad, but I returned the
Presonus and bought a Focusrite, which works without an USB hub.
The 4-Port device is really inexpensive.
English
https://www.reichelt.com/de/en/de/de/usb-2-0-4-port-hub-with-power-supply-unit-delock-61393-p73906.html?GROUPID=6906&START=0&OFFSET=16&SID=96XESdZKwQAT4AAGdwyYs8f6e0329ee2f1322451f945bbed4625a&&r=1
German
https://www.reichelt.com/de/de/usb2-4-port-hub-2-0-mit-netzteil-delock-61393-p73906.html?&trstct=pol_3
There is a 7-port USB hub.
English
https://www.reichelt.com/de/en/usb-2-0-7-port-hub-with-power-supply-unit-black-d-link-dub-h7-p131488.html?&trstct=pol_2
German
https://www.reichelt.com/de/de/de/en/usb-2-0-7-port-hub-mit-netzteil-schwarz-d-link-dub-h7-p131488.html?GROUPID=6906&START=0&OFFSET=16&SID=96XESdZKwQAT4AAGdwyYs8f6e0329ee2f1322451f945bbed4625a&&r=1
They might sell other >= 8-Port hubs, too, the search engine not
necessarily works, it could be worth to just search for USB hubs,
without mentioning the number of desired ports and to skim the pages.
--
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