We've all seen it somewhere, a lightbulb above someone's head when they get an idea, whether in a tv show or movie. Well, I will show you the same effect!
You need:
lightbulb
hammer
2 AA batteries (depending on your LED)
battery pack (or you could wire it up yourself)
LED or even flashlight bulb.
To retrieve a flashlight bulb, just unscrew the top of a flashlight, then take the lense and reflectors off the top so you can take the bulb. I got my bulb from an old IDon'tKnowWhat that lit up when it was turned on. I ripped mine off the PCB, but you can buy a bulb from Radioshack.
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Take out all that wiring and glass so you have the empty bulb. When you have cleared all broken glass, wiring, and other components, hit the bottom cap with scissors to make a hole. thats where your wire will go. You may have to move around the scissors in the hole to make it bigger.
The reason we took off the bottom cap is that all that wiring inside can mess up the LED and we need to get rid of it all.
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How difficult was the removal of the bottom cap? I've tried cutting the metal but its seems too hard :S
Never built it though.
I had intended to create a variable voltage switch as well so that the intensity of the light could be increased or decreased as well. I've been thinking about building one of these in my top hat, but have so far been loathe to maim it.