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I've built a number of little projects into Altoid type tins. The one the kids like is an audio modulated laser. I tore apart a laser pointer and mounted the laser diode on the end of a tin and built a small circuit to modulate it from an IPod or other audio device. I could shine the laser across the room onto a small solar cell hooked to a pair of headphones and transmit crystal clear audio via the laser beam.
Man, you are one talented dude!
No more than anybody else. Radio and electronics have just been a hobby of mine since I was a kid.

Man, you are one talented dude!
No more than anybody else. Radio and electronics have just been a hobby of mine since I was a kid.