This version uses a cool wooden circuit board to make assembling the leds and the resistors easy. It's great if soldering irons aren't viable, or you need a quick turn around.
Step 1: What's in the Kit?
Otherwise if you want to try an led moodlamp, here's an instructable that doesn't need a laser cutter!
Or, if you want to try a laser cut circuit board - the files are here. If your material is not 3mm, you'll need to use openscad to regenerate the dxf. Then you'll also need a couple of leds and some resistors.
Step 2: Extra Stuff You'll Need
an old roll of tape
Step 3: The Fun Part!
Step 4: Strip the Wires
Strip the ends of each of the wires inside, so there is about 1cm of bare wire. Twist the strands together to make them neat.
Step 5: Through the Holes...
Step 6: Find the Right Wires and Resistors - the Hard Bit
The kit gives you 2 sizes of resistor, so you've got some options. Use the picture on this page to work out the values in your kit. We'll try the biggest value first, and then if the led is too dim, we can use the lower value.
Start with one led, and hold one of the phone charger wires on one leg, and the other phone charger wire on the leg of the resistor. Touch the other leg of the resistor to the other leg of the led and see if it lights up. If not, try turning round the led. You can find out why leds need to be the right way round here.
Make a note of which wire connects to the shorter (negative) leg of the led. That's the negative wire. The other wire is the positive wire. In this case, the black wire is negative, and the white wire is positive.
If your phone charger has more than 2 wires, you'll have to try every combination until you find it!
If the led is too dim, then you can try the lower value resistor. The lower value lets more current through, which makes the led brighter. If the led is too bright though, you'll notice the resistor getting hot, and the led will probably die within months rather than years.
Step 7: Add an Led
Step 8: Twisting the Wires
Step 9: The Next Led
Then add the led and the resistor as before.
Step 10: Start Plugging
Push the plug gently on top, and make sure all 3 wires still in place!