Good news for actors, eavesdroppers and bat researchers. Emkay of Burgess
Hill in West Sussex claims to have developed the world鈥檚 smallest
broadcast-quality microphone. A pressure sensor and field-effect transistor
amplifier are packed into a 2.5-millimetre cylinder. It is easily hidden in an
actor鈥檚 hair, or could be used as a bug. The mike also records ultrasound, from
bats, for example.
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