Title: Cartridge muting circuit

Abstract: A muting circuit is provided for a phonograph record amplifier employing a semi-conductor cartridge wherein the cartridge has a shorting switch operative during the changing cycle wherein the amplifier associated with the cartridge is deactivated during the changing cycle of the pickup preventing transients in the output of the amplifier.

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Inventors: Dorren, Louis (Millbrae, CA, US)

Application Number: 461884
Filing Date: 1974-04-18
Publication_date: 1976-02-10
Assignee: Quadracast Systems, Inc. (San Mateo, CA)
Primary Class(es): 369/134 360/61, 369/145
Other Classes:
US Patent Ref:

3144522	Aug, 1964	Bernstein	179/100.
3280272	Oct, 1966	Simpson	274/1.
3321205	May, 1967	Dennis	274/10.
3334194	Aug, 1967	Chang	360/61.
3673345	Jun, 1972	Ban	360/74.
3705272	Dec, 1972	Tsuji et al.	362/62.

Other Refs:
Primary Examiner: Konick, Bernard
Assistant Examiner: Levy, Stewart
Attorney: Slick; Robert G.