JPS5471966A - Low frequency amplifier circuit - Google Patents

Low frequency amplifier circuit

Info

Publication number
JPS5471966A
JPS5471966A JP13870477A JP13870477A JPS5471966A JP S5471966 A JPS5471966 A JP S5471966A JP 13870477 A JP13870477 A JP 13870477A JP 13870477 A JP13870477 A JP 13870477A JP S5471966 A JPS5471966 A JP S5471966A
Authority
JP
Japan
Prior art keywords
voltage
base
diode
time
power supply
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
JP13870477A
Other languages
Japanese (ja)
Inventor
Yozo Kabayama
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.)
Toshiba Corp
Original Assignee
Toshiba Corp
Tokyo Shibaura Electric Co 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 Toshiba Corp, Tokyo Shibaura Electric Co Ltd filed Critical Toshiba Corp
Priority to JP13870477A priority Critical patent/JPS5471966A/en
Publication of JPS5471966A publication Critical patent/JPS5471966A/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 sound at a power supply time to shorten the stabilizing time for circuit operation by selecting a bias resistance value so that the bias voltage may become over the voltage between the base and the emitter of a trnasistor for preventing the shock sound just after power supply. CONSTITUTION:When resistance R3 is so selected that the voltage drop of bias resistance R3 may become over the voltage between the base and the emitter of transistor TrQ7 just after supplying power Vcc, TrQ7 is operated, and the current is next flowed to diode D1 to charge capacitor C2 through TrQ4 and Q6 instantaneously and increase the base potential of TrQ2; howver, the base potential is clamped by diode D2 to shorten the circuit operation time. Meanwhile, the base potential of TrQ1 and Q2 is held at the same potential by diode D2 when TrQ6 is operating; and the base potential of TrQ2 is prevented from overshoot to make the displacement of DC output voltage Vp smooth. As a result, the shock sound at a power supply time can be prevented, and the stabilizing time for circuit operation can be shortened.
JP13870477A 1977-11-18 1977-11-18 Low frequency amplifier circuit Pending JPS5471966A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP13870477A JPS5471966A (en) 1977-11-18 1977-11-18 Low frequency amplifier circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP13870477A JPS5471966A (en) 1977-11-18 1977-11-18 Low frequency amplifier circuit

Publications (1)

Publication Number Publication Date
JPS5471966A true JPS5471966A (en) 1979-06-08

Family

ID=15228167

Family Applications (1)

Application Number Title Priority Date Filing Date
JP13870477A Pending JPS5471966A (en) 1977-11-18 1977-11-18 Low frequency amplifier circuit

Country Status (1)

Country Link
JP (1) JPS5471966A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0159079A2 (en) * 1984-04-20 1985-10-23 STMicroelectronics S.r.l. Audio amplifier switch-on control circuit
EP0400643A2 (en) * 1989-05-31 1990-12-05 Kabushiki Kaisha Toshiba Amplifying apparatus with a differential amplifier stage

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0159079A2 (en) * 1984-04-20 1985-10-23 STMicroelectronics S.r.l. Audio amplifier switch-on control circuit
EP0400643A2 (en) * 1989-05-31 1990-12-05 Kabushiki Kaisha Toshiba Amplifying apparatus with a differential amplifier stage

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