I've used both of these without a hub without any problem. I use an old Samsung cell charger (I think 700ma). I don't generally have anything else drawing power

I've used both of these without a hub without any problem. I use an old Samsung cell charger (I think 700ma). I don't generally have anything else drawing power from the USB port though. http://www.amazon.com/gp/product/B0037G2BMY/ http://www.amazon.com/gp/product/B0037G2BMY/ http://www.amazon.com/gp/product/B004LPY204/ http://www.amazon.com/gp/product/B004LPY204/