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The Binchotan microphone: A pièce de résistance from the Stray Cats1
1.The Stray Cats is the nickname of the Aich and Gifu (Japan) Physics Circle, a group of extraordinary Japanese teachers of physics who, for over 40 years, have been developing ingenious physics demonstrations and experiments by using common materials in imaginative ways. Their take on the variable resistance microphone is typical of their creativity.
2.Binchotan is often used as a water purifier and is available from several online sources, including Amazon. Prices vary, but you will likely pay between $10 and $15 for two or three sticks.
3.Other types of charcoal tested have not produced a detectable signal.
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