Hardware hack - USB powered push from multiple USB ports

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nutterwithbutter
Posts: 39
Joined: Fri Oct 26, 2012 2:05 pm

Hardware hack - USB powered push from multiple USB ports

Post by nutterwithbutter » Sun Apr 24, 2016 12:57 am

just wanted to ask a question:

Is it possible to mod a cable that goes from multiple USB ports from my computer to a 12V DC 1.25

I know USB is 5V max output - what if i use 3 of my USB ports? Is it possible to create a custom cable that does this?

thanks!

ObtuseMoose
Posts: 137
Joined: Sat Dec 17, 2011 2:51 am

Re: Hardware hack - USB powered push from multiple USB ports

Post by ObtuseMoose » Mon Apr 25, 2016 1:31 pm

No. All the USB ports on one computer are ultimately powered by one 5 volt power supply. You would need independent, isolated power supplies for each port to do what you're suggesting.

--
Moose
"all the musical ability of a blocked nostril"

Stromkraft
Posts: 7033
Joined: Wed Jun 25, 2014 11:34 am

Re: Hardware hack - USB powered push from multiple USB ports

Post by Stromkraft » Mon Apr 25, 2016 7:51 pm

nutterwithbutter wrote:
Is it possible to mod a cable that goes from multiple USB ports from my computer to a 12V DC 1.25
Why would you want this if I may ask?
Make some music!

fishmonkey
Posts: 4105
Joined: Wed Oct 24, 2007 4:50 am

Re: Hardware hack - USB powered push from multiple USB ports

Post by fishmonkey » Wed Apr 27, 2016 12:46 am

ObtuseMoose wrote:No. All the USB ports on one computer are ultimately powered by one 5 volt power supply. You would need independent, isolated power supplies for each port to do what you're suggesting.

--
Moose
that's not necessarily true. most computers have multiple internal USB hubs. USB Y-cables that combine the power output of two USB ports are not uncommon, however this is to boost the amperage, not the voltage.
Stromkraft wrote: Why would you want this if I may ask?
presumably to get full display and pad brightness without a mains adapter...
badbrainz wrote: I'm a drummer, so I'm already at an intellectual disadvantage here

Stromkraft
Posts: 7033
Joined: Wed Jun 25, 2014 11:34 am

Re: Hardware hack - USB powered push from multiple USB ports

Post by Stromkraft » Wed Apr 27, 2016 6:28 pm

fishmonkey wrote:
Stromkraft wrote: Why would you want this if I may ask?
presumably to get full display and pad brightness without a mains adapter...
Sounds interesting.
Make some music!

nutterwithbutter
Posts: 39
Joined: Fri Oct 26, 2012 2:05 pm

Re: Hardware hack - USB powered push from multiple USB ports

Post by nutterwithbutter » Sat Apr 30, 2016 11:46 pm

yep - it was to ditch the mains adapter but still have full display brightness

back to the drawing board!

fishmonkey
Posts: 4105
Joined: Wed Oct 24, 2007 4:50 am

Re: Hardware hack - USB powered push from multiple USB ports

Post by fishmonkey » Sun May 01, 2016 10:38 am

you could use a small 12 V lithium power brick...
badbrainz wrote: I'm a drummer, so I'm already at an intellectual disadvantage here

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