These home-made hifi headphones work as well or better than Sony or Bose noise-cancelling headphones. Cost: $2. Time to make:one minute. Difficulty:none. Unlike the commercial products, these block outside noise instead of cancelling it.
Listen to music or books on tape without hearing traffic noise, screaming babies, etc.
I've been making these for more than a decade.
Build jackhammer headphones
Click through to watch this video on instructables.com
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It is slightly more complicated but a huge improvement if you drill two small holes for the speaker wires and seal with some stout glue. I work around screaming jet aircraft all day and I've built quite a number of different types, I've even built in a small MP3 player.
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