Instructables

Step 5: 2N3904 NPN BI-POLAR JUNCTION TRANSISTOR, THE FINAL FRONTIER !

Picture of 2N3904 NPN BI-POLAR JUNCTION TRANSISTOR, THE FINAL FRONTIER !
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The transistor part is nearly done, just the base leg left:
  1. Cut and strip some wire
  2. Twist the wire around the middle leg of the transistor
  3. Solder the wire in place
  4. Solder the other end of the wire to a 10k resistor
  5. Connect this resistor to pin 13 of the arduino with solder if using the nano.