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Old November 24, 2007, 03:29 PM   #8
chris in va
Senior Member
Join Date: December 26, 2004
Location: Louisville KY
Posts: 13,534
I bought some $100 Radian muffs last year from a local store. They do the 'clip' thing, shutting off all sound for a couple seconds. After a while they started to develop a buzz that was distracting so I took them apart...

Seems the 'electronics' consist of a small metal cylinder with a tornado-looking spring in the middle. A strong sonic pulse would make the spring jiggle and hit the metal cylinder, cutting the sound.

They're somewhere in a landfill now.
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