Many people get scared when they see all those weird circuits with those symbols on it. Having no clue what they mean.
That's why I made a instructable friendly circuit image :) See photo 1.
1. Make sure you have all the materials to make the circuit. And enough electrical wires to connect all the components.
2. Before we build the circuit, we first need to put the audio cable through the whole in the back.
3. Build your circuit, and test it out. The best way to test it is through your audio output from your computer. Make sure the audio on your computer is set to 100% and then test it.
Circuit: The positive pole from the adapter goes to the positive leg of the first LED. Next the other 5 LED's follow. Hook the negative leg from the first LED to the positive leg of the second LED. Hook the negative leg from the second LED to the positive leg of the third LED, and so on. The negative LED from the last LED goes to the center pin of the TIP31.
Then hook the right pin of the TIP31 to the negative pole of the adapter.
All there's left now is to hook up the audio cable. Hook the red or the white wire from the audio cable on the left pin of the TIP31. And connect the ground wire from the audio cable to the right pin of the TIP31.
For better details please see photo 1, the circuit.
4. If your circuit works, solder all components together so the circuit stays together nice and strong and wont fall apart.
When done with these steps it's time to finish up!
If you have trouble getting the circuit to work, you can try to set it up first on a circuit board.
Carlosserious was so kind to make a how-to video on making the circuit, click here for the video.