JPS5637711A - Transient sound preventing circuit - Google Patents

Transient sound preventing circuit

Info

Publication number
JPS5637711A
JPS5637711A JP11387479A JP11387479A JPS5637711A JP S5637711 A JPS5637711 A JP S5637711A JP 11387479 A JP11387479 A JP 11387479A JP 11387479 A JP11387479 A JP 11387479A JP S5637711 A JPS5637711 A JP S5637711A
Authority
JP
Japan
Prior art keywords
stage
point
rises
stages
amplifier
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.)
Pending
Application number
JP11387479A
Other languages
Japanese (ja)
Inventor
Koji Takeda
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.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
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 Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP11387479A priority Critical patent/JPS5637711A/en
Publication of JPS5637711A publication Critical patent/JPS5637711A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
    • H03F1/30—Modifications of amplifiers to reduce influence of variations of temperature or supply voltage or other physical parameters
    • H03F1/305—Modifications of amplifiers to reduce influence of variations of temperature or supply voltage or other physical parameters in case of switching on or off of a power supply

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Amplifiers (AREA)

Abstract

PURPOSE:To prevent the shock during the make of the power supply, by securing a quicker rise of the current for the bias circuit of the constant current source at the A-class amplifying stage of the 1st stage or between the stages of the amplifiers than the power source of the amplifier and thus ensuring a quick normal operation for the constant current source at the 1st stage or between the stages of the amplifier. CONSTITUTION:The time constant of the decoupling circuit is set sort for the bias circuit of the constant current source and set long for the 1st stage, between the stages and the output stage of the amplifier respectively. In other words, the potential at the point B rises up more quickly than that at the point A when the current is flowed with application of +VCC by satisfying T2(=C2R2) <<T1(=C1R1), where R1 and R2 show the resistance values of the resistors 27 and 31, C1 and C2 are the capacity of the capacitors 28 and 32, and T1 and T2 are the time constant. As the potential of the point B rises up, the current flows to the diodes 22 and 23 through the resistor 21. And thus the bias is given to the transistors 6 and 15 of the constant current source of the A-class amplifying stage at the 1st stage and between the stages of the amplifier. Then the potential of the point A rises up slowly after a sufficient operation of the transistors 6 and 15. And the potential fluctuation of the output terminal 20 rises up slowly based on the rise of the point A, thus producing no shock sound during the make of the power supply.
JP11387479A 1979-09-05 1979-09-05 Transient sound preventing circuit Pending JPS5637711A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP11387479A JPS5637711A (en) 1979-09-05 1979-09-05 Transient sound preventing circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11387479A JPS5637711A (en) 1979-09-05 1979-09-05 Transient sound preventing circuit

Publications (1)

Publication Number Publication Date
JPS5637711A true JPS5637711A (en) 1981-04-11

Family

ID=14623272

Family Applications (1)

Application Number Title Priority Date Filing Date
JP11387479A Pending JPS5637711A (en) 1979-09-05 1979-09-05 Transient sound preventing circuit

Country Status (1)

Country Link
JP (1) JPS5637711A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0281117A2 (en) * 1987-03-06 1988-09-07 Kabushiki Kaisha Toshiba Pop noise suppression circuit for audio amplifier

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0281117A2 (en) * 1987-03-06 1988-09-07 Kabushiki Kaisha Toshiba Pop noise suppression circuit for audio amplifier

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