Electronics: Fun & Fundamentals

THE ECLECTIC Electret MICROPHONE

Written and photographed by Charles Platt

EASY

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Time Required: 1 Hour Cost: $10–$20

Materials

» Electret microphone Most 8mm or 10mm electrets will work in this circuit, such as RadioShack #270-0090.

» Ceramic capacitors: 0.1µF (2), 0.68µF, 10µF (2)

» Electrolytic capacitor, 330µF

» Resistors: 22Ω, 1K (2), 1.5K, 3.3K, 10K, 100K (2)

» Trimmer potentiometers: 10K, 100K

» Integrated circuits: LM741, LM386 Manufacturers may precede these generic part numbers with additional letters or ...

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