Cup Speaker and Microphone
By Cy Tymony ■ Illustrations by Mark Frauenfelder
You will need
Cup
Magnet
Thin insulated wire
1⁄8" plug cable
Radio or music player (with earphone jack)
Turn a cup into a speaker and a microphone. People seldom think about the common devices they use everyday and even less about adapting them for other purposes. Anyone can learn real-life MacGyverisms using everyday items—you just have to be a little sneaky.
1. Turn a cup into a speaker.
A typical speaker consists of a coil of wire attached to a paper cone with a magnet mounted close by. When an audio signal travels through the wire, it creates a magnetic field. ...
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