Electronics: Fun & Fundamentals
THE ECLECTIC Electret MICROPHONE
Written and photographed by Charles Platt
EASY
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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