My Wii Sensor Bar is built of two arrays of IR-LED that get its power from a proprietary
port on the Wii / WiiU. Since I have a beamer as second screen with its own Sensor Bar,
a Wii-to-HDMI-Adapter and a 4x2 HDMI switch I don't want to unplug and reconnect
the sensor bar cable anymore when I switch from one screen to the other.
My idea: connect one sensor bar to the USB port of the TV, and the other one to
the USB port of the beamer, so both will only be enabled when the specific screen
is in use. Another reason to get power from an external power supply could be that
you have both, a Wii and a WiiU.
So, I've tried to find out what current and amperage the sensor bar requires, and
since I did not find any reliable information I've took a screwdriver, my multimeter
and had a look at it.