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Mini-microphone
Push two pencil
leads through the short sides of a matchbox, just above the base. Scrape off
some of the surface, and do the same with a shorter lead, which you lay across
the top. Connect the microphone with a battery and earphone in the next room.
(You can take the earphone from a transistor radio.) Hold the box horizontal
and speak into it. Your words can be heard clearly in the earphone. The current
flows through the graphite “leads”. When you speak into the box, the base
vibrates, causing pressure between the “leads” to alter and making the current
flow unevenly. The current variations cause vibrations in the earphone.
Does this mic need to be plugged into an amplifier? hyperx quadcast
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