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Easy Joule Thief Circuit
This is a really clever way to make the magnetic battery connector.
Simple Flip Flop Circuit
Fun little circuit! I made some minor changes (33 uF caps, 2N2222 transistors, 180 Ohms for the smaller resistors, no battery clip). I hooked it up to my 6V battery pack and it works. I enjoyed making it.
Such a nice, simple idea - thanks for posting this! I have a lot of earring hooks and beads, and I've been looking for good ways to use them.
This is awesome! I had no idea until I read about it in another instructable that links to this one. I used alligator clips attached to the plug of a little battery-powered speaker set (external speakers meant for mp3 players and the like). I did not recognize the tune, but it definitely was music!Speaking of curiousity, I once put a data CD into my CD player in hope of getting some weird fax-machine-type sounds (no, it did not work, unfortunately). I have to say that if I had found this on my own (with a light microphone, say), I would have been surprised enough to doubt my perception. ;-)Now I'm going to try it again with earphones and see if I can recognize the tune.