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The other day I put together a very simple music driven led box, and it occurred to me that the same concept might just work with a laser. Basically it involves a transistor (i used a TIP31) and an audio cable. I originally found the diagram for this setup on instructables, but keep in mind it...

I've noticed that whenever I fire my bluray up into the night sky, the bats in nearby trees go completely insane. Not only do they squak like a flock of angry geese, but they swarm the area randomly almost in a frenzy. Anyone else notice this? Normally the bats around here swoop at dusk and...