I don't understand why the IR Transmitter is composed of an IR LED with 2 pins connected to some other and seemingly meaningless component with 3 output pins.
I can't see this component from your photograph. In fact I can't see any components at all.
I would connect it up with a 220R seriese resistor to 5V and ground and measure the voltage across the LED. Look at the LED through the electronic viewfinder of a camera to see which way round it lights. Then drive it with a transistor and work out the resistor to give you 80mA current through it.