Abstract
The electret capacitive microphone element is ideally suited for miniature applications. The simplicity of its structure leads to a straightforward design even in very small devices. Since the electret foil is the only moving element, and the foil-back electrode spacing the only critical dimension, the electret cartridge is simple in design and extremely rugged. Careful design of the cartridge and associated preamplifier is required to minimize the microphone's self noise. The principal aspects of a miniature electret microphone design are discussed, including the cartridge and the preamplifier, and two examples of small omnidirectional microphones are given.
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