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USB OTG and charging simultaniously

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Satom

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Hey there,
first of all I hope, that I'm right here, cause I'm new in this board.
Now to my plan:
I want to build an USB OTG cable for my Moto G to access an USB stick or mount a keyboard and charge the phone at the same time. Circuit and outter appearence are already created (on paper), but there is still at least one open question:
Will the stick or any other device drain all power?
For better understanding of this question here is a sketch of the circuit:
IMG_20140220_211605189.jpg

I hope for usefull respond,
Satom
 

Is there noone who can help me?
 

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