"Dead" Battery Lamp

Step 3: Solder It

First, strip and twist 2 of the opposite colored wires together. Slip some shrink wrap onto the positive battery holder wire, and then twist the positive wire onto the other 2 wires. Solder those wires, and then shrink wrap them. Take another wire (the green wire for me) and strip it. Solder the wire onto the resistor, and shrink wrap it. Then, fold the transistor wire back, and solder the resistor to it. Take the last unsoldered wire from the coil (my red wire, not from the battery holder) and solder it to the right pin of the transistor. You should bend the pin out a bit so it doesn't short out. For the last pin, solder the ground wire (black) from the battery holder to the left pin. For the 2nd to last soldering step, measure 2 wires approx. 3 in. longer than your heavy gauge wire. Strip the ends of both, and solder 1 to the left transistor pin (the one with my black ground wire from my battery holder) and the other one to the right transistor pin (the one with my red coil wire). My red wire is + for the LED's and the black wire is ground for the LED's.