Muting circuit

  • Inventors:
  • Assignees: Hitachi Ltd
  • Publication Date: September 28, 1981
  • Publication Number: JP-S56123108-A


PURPOSE: To prevent a pop sound when the power source is put to work by providing a resistance in series to a signal line, by providing a transistor between the output side of the resistance and the earth, and by driving the transistor by a lateral type transistor. CONSTITUTION: A signal having the DC component eliminated via coupling capacitor C is applied via fixed resistance R, and between the output side of resistance R and the earth, transistor Q 1 is provided to perform muting operation by ulitizing the ON resistance of transistor Q 1 . Between the base of transistor Q 1 and muting control input terminal VC, lateral type transistor Q 2 is provided, and to prevent transistor Q 1 from getting saturated, diode Q 3 is provided at the base of transistor Q 2 . Since transistor Q 1 turns on at a low voltage, a pop sound generated when the power source is turned on can be prevented. COPYRIGHT: (C)1981,JPO&Japio




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    JP-H0342522-B2June 27, 1991
    JP-H0528812-Y2July 23, 1993
    JP-S58198907-ANovember 19, 1983Pioneer Electronic CorpMalfunction preventing circuit of muting amplifier
    JP-S60141005-AJuly 26, 1985Rohm Co LtdOutput muting circuit
    JP-S63114513-UJuly 23, 1988