The construction and characteristics of electret microphone capsules for incorporation in various equipments or for use in tape recorder microphones is discussed. As the basic unit is a simple capacitive transducer which can, by additional acoustical means, be used either in omni-directional or directional microphones, its uses are manifold and it is inexpensive.
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https://aes2.org/publications/elibrary-page/?id=1839
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