Step 8: Solder It! part 5
Bend the capacitor so it lies over the resistors, this will make it stick out less.
Next are the four transistors Q1 Q2 Q3 and Q4. These are the devices that turn on and off the high power IR LEDs. The microcontroller doesn't have the capability to provide a lot of power directly to the LEDs so these transistors assist it.
Transistors have three pins. bend the middle pin back a little and insert it so that the rounded and flattened sides match up with the picture silkscreened onto the circuit board, as shown. The transistor won't be able to sit flat against the circuit board, so just make it poke up a few millimeters.
Insert all 4 transistors.
Turn the PCB over and solder in all the transistors. Then clip the wires.