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I'm powering a 2nd Pi directly off my desktop PC now. Seems a few are doing it this way - the big issue is the avalable power out of the USB sockets - it's 140mA per socket (I previously thought it was 140mA in total, but there are 2 polyfuses). However there are lots of "whinges" abotu this on the forums - being too low and there are some creative solutions, but my take is to simply use a powered hub - I'm using a LOGIK one I bought from PC World for about £12. It comes with a 2A PSU and leaves me 4 ports should I need them (one on the Pi, 3 on the hub)
This more or less shows the setup:
http://unicorn.drogon.net/mess3.jpg
(the base is from http://www.skpang.co.uk/ )
Gordon
Thanks very much Gordon. I didn't realise that you could do that. This means that I can get it running immediately rather than having to wait.
I have the psu with the micro usb connection on my cowon mp3 player but, that didn't work - not powerful enough.
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