An LED is simply like a light bulb but the wires coming out of them are sensitive to polarity (+ or -). The lower right sketch shows the typical LED bulb with its polarity sensitive wire connections. They are used in just about everything including break lights now-a-days. They are ultra cheep if you just buy the generic ones at Radio Shack. I got mine from DigiKey, and these "Super Bright LEDs" are like laser beams. (but they cost about 1 dollar a piece). I used red ones, but you can also get colors of green, blue, and yellow. The LEDs must operate with 3 volts across each one. Since they are hooked up in series, 3+3=6 voltage supplied. To get a 9-Volt battery to supply 6 volts, I used a 47 Ohm. resistor (this will have 3 volts across it leaving 6 volts for the rest of the circuit). To attach them to my face was rather tricky. I first bent a continuous, small gauge piece of copper wire (about 2 feet for starters) around the bridge of my nose and underneath each eyebrow (it took me 2 hours to get it the way I wanted). I then soldered both terminals of both LEDs onto the wire so that they were positioned in front of my eyes. I then trimmed the wire between the two soldered on posts coming out of each LED. This made it so that the current from the battery would just go through with wire under my left eyebrow into the LED, out the other side, through the wire over my nose bridge, into the other Led, out the other side and through the wire under my right eyebrow. A connection schedual is below:
Positive battery to switch (flexy wire), switch to 47 Ohm resistor (flexy wire), resistor to positive side of Left eye LED (face wire frame), Negative side of LED to Positive side of Right eye LED (face wire frame), Negative side of Right Eye LED to Negative side of Battery (Face wire frame and flexable wire).
You will want to attach an insulated wire onto the bare copper wire face frame behind your ears. And leave plenty of loose wire between you ear connections and the battery/switch, you don't want to jostle the little lights into your eyes.
I want to put one of these lights in my mouth, but I haven't gotten around to making one saliva proof.
P.S. If you sweat while wearing them, you'll recieve little tiny electric shocks not bad -they made me giggle at the whole oddity of the endeavor.
