This Guy Builds His Own Speaker With Just a Copper Wire and Magnet
https://www-newz.blogspot.com/2014/08/this-guy-builds-his-own-speaker-with.html
YouTuber Andy Elliott (mist8k) stumbled upon an awesome DIY discovery. While "tinkering with a small electric engine," he describes in his video, "my audio jack accidentally came in contact with the engine...and started randomly playing music." Elliott unknowingly built his own speaker.
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