JPS57147304A - Amplifying circuit - Google Patents

Amplifying circuit

Info

Publication number
JPS57147304A
JPS57147304A JP56032973A JP3297381A JPS57147304A JP S57147304 A JPS57147304 A JP S57147304A JP 56032973 A JP56032973 A JP 56032973A JP 3297381 A JP3297381 A JP 3297381A JP S57147304 A JPS57147304 A JP S57147304A
Authority
JP
Japan
Prior art keywords
signal
generation
potential
differential amplifier
bias
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
JP56032973A
Other languages
Japanese (ja)
Inventor
Shigeru Nakajima
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.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial 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 Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP56032973A priority Critical patent/JPS57147304A/en
Publication of JPS57147304A publication Critical patent/JPS57147304A/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 generation of a harsh shocking sound by preventing the generation of a pulse by holding the DC potential of the output terminal of an amplifying circuit constant without reference to the state of a muting switch, etc. CONSTITUTION:A signal from an input terminal 1 is superposed upon a DC bias through a capacitor C1, and while the resulting signal is inputted to a differential amplifier consisting of transistors (TR) Q3 and Q4 and a current source TRQ5, a DC bias having the same potential is applied to a differential amplifier consisting of TRs Q6 and Q7, and a current source TRQ8. The output terminals of those differential amplifiers are connected mutually through a base resistance R6 to be held at the same potential. A signal amplifier by the formed differential amplifier is outputted from an output terminal 2 through an AC coupling capacitor C3. Then, when a changeover switch S is operated to perform muting, the signal is cut off, cut the DC potential is maintained, preventing the generation of a shocking sound.
JP56032973A 1981-03-06 1981-03-06 Amplifying circuit Pending JPS57147304A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56032973A JPS57147304A (en) 1981-03-06 1981-03-06 Amplifying circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56032973A JPS57147304A (en) 1981-03-06 1981-03-06 Amplifying circuit

Publications (1)

Publication Number Publication Date
JPS57147304A true JPS57147304A (en) 1982-09-11

Family

ID=12373832

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56032973A Pending JPS57147304A (en) 1981-03-06 1981-03-06 Amplifying circuit

Country Status (1)

Country Link
JP (1) JPS57147304A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5014017A (en) * 1988-08-12 1991-05-07 Sanyo Electric Co., Ltd. Power-saving low-frequency power amplifier

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS50116106U (en) * 1974-03-08 1975-09-22
JPS53158924U (en) * 1977-05-20 1978-12-13

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS50116106U (en) * 1974-03-08 1975-09-22
JPS53158924U (en) * 1977-05-20 1978-12-13

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5014017A (en) * 1988-08-12 1991-05-07 Sanyo Electric Co., Ltd. Power-saving low-frequency power amplifier

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