Toy carbon microphone

Details Toy carbon microphone Toy carbon microphone

1975-06-05

1976-07-06

Claffy, Kathleen H.

H04R 2102

Patent

active

039683320

ABSTRACT:
A resistance microphone for a toy telephone mouthpiece includes a pair of circularly bored cylindrical carbon cups secured to a plastic sheet diaphragm in opposed spaced apart relationship and a cylindrical carbon rod having two conical ends held loosely in the cups. Holes are provided in the diaphragm on opposite sides of the cups and wires are wrapped around the cups, in annular grooves in the cup peripheries, threaded through the openings and twisted onto themselves to both secure the cups to the diagram and to provide contact leads for the microphone.

REFERENCES:
patent: 316204 (1885-04-01), Waite et al.
patent: 508829 (1893-11-01), Noriega
patent: 666677 (1901-01-01), Holcombe
patent: 3909558 (1975-09-01), O'Brien

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