History and Current Status of Miniature Variable-Reluctance Balanced-Armature Transducers
The manner in which modern microphone and telephone receivers, as currently used in hearing aids and the like, has evolved from early telephone receivers is described. The occluded volume of a typical unit is less than one-quarter inch cube. The manner by which a reasonably flat response is secured from variable-reluctance microphones is indicated by consideration of their equivalent circuit, and illustrative data is given on typical microphones and receivers including a new unit only 0.375 in. long, 0.220 in. wide and 0.160 in. thick.
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