It is my extra cheaper design for a wii bar.
8 - IR leds
1 - recycled utp wire
1 - recycled usb port
We are going to use 5v volts for any USB port at the machine. I also used a utp cable, leaving just 2 pairs (one for each battery of leds).
The leds will be connected in serial mode (4 x ~1.2v = ~4.8).
Once you have the 2 battery leds, just connect each one to each end of pairs.
Put them at a distance of 20-30cm in a plane and try it.
You can check the IR leds with your cellphone camera on night vision ;-)