JPS5662408A - Audio amplifier - Google Patents

Audio amplifier

Info

Publication number
JPS5662408A
JPS5662408A JP13765879A JP13765879A JPS5662408A JP S5662408 A JPS5662408 A JP S5662408A JP 13765879 A JP13765879 A JP 13765879A JP 13765879 A JP13765879 A JP 13765879A JP S5662408 A JPS5662408 A JP S5662408A
Authority
JP
Japan
Prior art keywords
transistors
conductive
power supply
output
keep
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
JP13765879A
Other languages
Japanese (ja)
Other versions
JPS6247366B2 (en
Inventor
Norihisa Kato
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.)
Hitachi Ltd
Original Assignee
Hitachi 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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP13765879A priority Critical patent/JPS5662408A/en
Publication of JPS5662408A publication Critical patent/JPS5662408A/en
Publication of JPS6247366B2 publication Critical patent/JPS6247366B2/ja
Granted 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 production of pop sound at the reapplication of power supply, by providing an reverse current blocking circuit with a transistor which keeps the output potential for a given time at ''0'' to reduce the production of pop sound at the application of power supply. CONSTITUTION:When a power switch SW is closed, driving transistors Q6, Q7 are also conductive since transistors Q12, Q13 are conductive. Thus, transistors Q8, Q9 at the push-pull output stage are conductive to keep the output voltage to ground level. When the charging of a capacitor C2 advances, the base potential of Q12, Q13 is increased to keep the transistors of both uonconductive. When SW is open, the base potential of Q 2 os slowly lowened than that of Q1 with the operation of an reverse current remains ground level. In this case, no output is produced until Q1 and Q2 are balanced even if power supply is reapplied.
JP13765879A 1979-10-26 1979-10-26 Audio amplifier Granted JPS5662408A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP13765879A JPS5662408A (en) 1979-10-26 1979-10-26 Audio amplifier

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP13765879A JPS5662408A (en) 1979-10-26 1979-10-26 Audio amplifier

Publications (2)

Publication Number Publication Date
JPS5662408A true JPS5662408A (en) 1981-05-28
JPS6247366B2 JPS6247366B2 (en) 1987-10-07

Family

ID=15203779

Family Applications (1)

Application Number Title Priority Date Filing Date
JP13765879A Granted JPS5662408A (en) 1979-10-26 1979-10-26 Audio amplifier

Country Status (1)

Country Link
JP (1) JPS5662408A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57119907U (en) * 1981-01-21 1982-07-26

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5081246A (en) * 1973-11-16 1975-07-01

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5081246A (en) * 1973-11-16 1975-07-01

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57119907U (en) * 1981-01-21 1982-07-26

Also Published As

Publication number Publication date
JPS6247366B2 (en) 1987-10-07

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