Iron Man Heart
The goal of this little project is to make a little light up design to appear like the arc reactor over Iron Man's heart. It's good for dress up occasions like Halloween, parties, or running errands. The laser cut plates work to hold the resistors in place, and that's pretty much it. There are only two pieces, since any more and it would get to be too thick, and any more pieces would be unnecessary. I just glued the two pieces together; the LED's and battery can be put in later. In the middle there is room for a battery terminal, and an LED can fit in each little hole.
On the right is an image of the two pieces glued together. Now, when I made mine I had the idea that I would be placing lots of LED's on this and make it super bright and all that jazz. That is what the entire outer ring is about, even though I did not use that ring. When I got to making it, I realized that six LED's made a light plenty bright enough, and form a nice neat pattern. For power, I just use a bank of three AAA batteries. That gets the voltage up to 4.5 V, enough to power the lights.
In order to power the lights, you will need to wire them all up in parallel. That will provide the same voltage to each LED, and then you can wire a resistor in series with the LED to provide the desired current through each loop. How you build the circuit is up to you; there are slots that leave room for wires, but I ended up not using them much when I decided to only wire up 6 LED's.
Once you have the LED's all wired up and battery terminal installed, you should cover the surface with an opaque screen to diffuse the light. For this I used a latex glove. On the left you can see the final result. I cut off the fingers and cut a slit in the palm of the glove, such that I could stretch the latex around the battery terminal. I then used some electrical tape to tie down the edge of the glove and give it a uniform appearance.
The last comment is about turning it on and off. I chose to just remove a battery when I wanted to power it off. I didn't find it worth it to install a switch on this, since I plan to just leave it on for extended periods of time anyway.