From USB power to battery power...

Thread Starter

Marc0

Joined Nov 28, 2011
42
Hi, I have a little midi keyboard that is USB powered. It draws 5 v and 200ma ... I want it to be more portable and I was wondering if it's possible to supply the required power with a battery packet...and what size, eventually.
The battery + and - could be attached to the USB + and -
The USB data cables are unimportant, because the midi keyboard draws only power from it, not data.
Is it doable? And how, practically?
 
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