JPS54117663A - Amplifier - Google Patents

Amplifier

Info

Publication number
JPS54117663A
JPS54117663A JP2465578A JP2465578A JPS54117663A JP S54117663 A JPS54117663 A JP S54117663A JP 2465578 A JP2465578 A JP 2465578A JP 2465578 A JP2465578 A JP 2465578A JP S54117663 A JPS54117663 A JP S54117663A
Authority
JP
Japan
Prior art keywords
amplifier
output
control
capacitor
circuit
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
JP2465578A
Other languages
Japanese (ja)
Inventor
Hisashi Sotokari
Yukiaki Hamaoka
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.)
NEC Corp
NEC Engineering Ltd
Original Assignee
NEC Corp
NEC Engineering Ltd
Nippon 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 NEC Corp, NEC Engineering Ltd, Nippon Electric Co Ltd filed Critical NEC Corp
Priority to JP2465578A priority Critical patent/JPS54117663A/en
Publication of JPS54117663A publication Critical patent/JPS54117663A/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 reduce the shock sound generated at a power supply time and reduce the transient voltage to prevent the destruction of a semiconductor by providing a control circuit in the power amplifier constituted by the semiconductor. CONSTITUTION:In the power amplifier circuit where the output amplifier constituted by a differential amplifier connected to input terminal a and feedback terminal c, the second amplifier or Darlington connection operated by the output of the amplifier above and transistors Tr 18 to 21 operated by the second amplifier is provided and the output of this output amplifier is fed back to the differential amplifier through a time constant circuit, Tr 26 to supply the current to the connection point between resistance 10 of this feedback circuit and capacitor 11 is provided. Further, Tr 27 to move the output terminal voltage up to the reference potential by driving forcedly the second amplifier is provided. Then, Tr 29 to control the conduction and breaking between Tr 26 and 27 by the current of the collector and capacitor 28 which is connected to the base of Tr 29 and determines the control time are provided, and this capacitor 28 is charged at a power supply time to control Tr 29, thereby reducting the transient current at a power supply time.
JP2465578A 1978-03-03 1978-03-03 Amplifier Pending JPS54117663A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2465578A JPS54117663A (en) 1978-03-03 1978-03-03 Amplifier

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2465578A JPS54117663A (en) 1978-03-03 1978-03-03 Amplifier

Publications (1)

Publication Number Publication Date
JPS54117663A true JPS54117663A (en) 1979-09-12

Family

ID=12144150

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2465578A Pending JPS54117663A (en) 1978-03-03 1978-03-03 Amplifier

Country Status (1)

Country Link
JP (1) JPS54117663A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57158217U (en) * 1981-03-31 1982-10-05
JPS62101105A (en) * 1985-10-28 1987-05-11 Honda Motor Co Ltd Method of starting ultra-low frequency amplifier circuit

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57158217U (en) * 1981-03-31 1982-10-05
JPS62101105A (en) * 1985-10-28 1987-05-11 Honda Motor Co Ltd Method of starting ultra-low frequency amplifier circuit

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