JPS5636209A - Muting circuit - Google Patents

Muting circuit

Info

Publication number
JPS5636209A
JPS5636209A JP11198579A JP11198579A JPS5636209A JP S5636209 A JPS5636209 A JP S5636209A JP 11198579 A JP11198579 A JP 11198579A JP 11198579 A JP11198579 A JP 11198579A JP S5636209 A JPS5636209 A JP S5636209A
Authority
JP
Japan
Prior art keywords
voltage
capacitor
charging
rapidly
tuner
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP11198579A
Other languages
Japanese (ja)
Other versions
JPS6017247B2 (en
Inventor
Makoto Hiramatsu
Yoshiaki Sano
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fujitsu Ltd
Original Assignee
Fujitsu Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP54111985A priority Critical patent/JPS6017247B2/en
Publication of JPS5636209A publication Critical patent/JPS5636209A/en
Publication of JPS6017247B2 publication Critical patent/JPS6017247B2/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G3/00—Gain control in amplifiers or frequency changers
    • H03G3/20—Automatic control
    • H03G3/30—Automatic control in amplifiers having semiconductor devices
    • H03G3/34—Muting amplifier when no signal is present
    • H03G3/348—Muting in response to a mechanical action or to power supply variations, e.g. during tuning; Click removal circuits

Landscapes

  • Control Of Amplification And Gain Control (AREA)
  • Amplifiers (AREA)
  • Noise Elimination (AREA)

Abstract

PURPOSE:To prevent a temporary large output generated for power supply, by charging the capacitor in the AGC circuit rapidly for power supply. CONSTITUTION:Charging circuit CHG charges capacitor C1 with a very small charging constant rapidly at the rise time (supply time) of power VCC applied to terminal TV. That is, constant voltage E and voltage E' obtained by dividing the tuner power source voltage by resistances RA and RB are applied to the (+) input terminal and the (-) input terminal of the differential amplifier respectively, and a prescribed-value voltage is generated to charge capacitor C1 rapidly at the supply time of power VCC. After the tuner power source voltage reaches the tuner operation voltage, output E' of the power source voltage detecting circuit consisting of resistances RA and RB becomes constant voltage E or more, and the differential amplifier loses the output to stop charging of capacitor C1.
JP54111985A 1979-08-31 1979-08-31 muting circuit Expired JPS6017247B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP54111985A JPS6017247B2 (en) 1979-08-31 1979-08-31 muting circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP54111985A JPS6017247B2 (en) 1979-08-31 1979-08-31 muting circuit

Publications (2)

Publication Number Publication Date
JPS5636209A true JPS5636209A (en) 1981-04-09
JPS6017247B2 JPS6017247B2 (en) 1985-05-01

Family

ID=14575054

Family Applications (1)

Application Number Title Priority Date Filing Date
JP54111985A Expired JPS6017247B2 (en) 1979-08-31 1979-08-31 muting circuit

Country Status (1)

Country Link
JP (1) JPS6017247B2 (en)

Also Published As

Publication number Publication date
JPS6017247B2 (en) 1985-05-01

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