Question: How can I add power to a USB cable without using a USB hub?
I have a USB device that runs on bus power. I don't know how much bus power it requires (I googled).
When I plug it into my Macbook Pro, it works.
When I plug it into my iPad Camera Connection Kit, it doesn't work.
Googling confirms that this device needs more bus power than provided is by iPad, but people say they have made the device work with iPad by using a powered USB hub.
So I bought a USB cable that has two male A connectors and one male B connector; the cable is marketed for connecting USB hard drives that require extra power: one male A has power and data lines, the other male A has only power lines.
I tried that cable with my iPad and USB device and it doesn't work; the device doesn't light up any of its LEDs.