JPS54161305A - Ac amplifying device - Google Patents

Ac amplifying device

Info

Publication number
JPS54161305A
JPS54161305A JP7008578A JP7008578A JPS54161305A JP S54161305 A JPS54161305 A JP S54161305A JP 7008578 A JP7008578 A JP 7008578A JP 7008578 A JP7008578 A JP 7008578A JP S54161305 A JPS54161305 A JP S54161305A
Authority
JP
Japan
Prior art keywords
output terminal
feedback
amplifier
supplied
main power
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
JP7008578A
Other languages
Japanese (ja)
Inventor
Hisao Sekine
Ryuichi Kioka
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
Original Assignee
NEC Corp
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, Nippon Electric Co Ltd filed Critical NEC Corp
Priority to JP7008578A priority Critical patent/JPS54161305A/en
Publication of JPS54161305A publication Critical patent/JPS54161305A/en
Pending legal-status Critical Current

Links

Landscapes

  • Signal Processing Not Specific To The Method Of Recording And Reproducing (AREA)
  • Amplifiers (AREA)

Abstract

PURPOSE: To prevent the DC potential at an output terminal from flucutating by a transient phenomenon by generating one pulse, when a main power is supplied, so that the both terminals of a DC feedback impedance of an amplifier may be short-circuited through a switching circuit.
CONSTITUTION: In response to one pulse generated by a pulse generator 30 when a main power is supplied, a switching circuit 29 connected in parallel with the feedback resistor 11 of an AC amplifier A is driven so that the resistor 11 is short- circuited to reduce the feedback resistance and so that a bypass capacitor 13 for determining the AC gain is charged. As a result, the output terminal 5 of the amplifier A has a substantially equal potential to that of a feedback terminal 3 so that the DC potential at the output terminal does not fluctuate. As a result, no abruptly fluctuating voltage is not impressed upon a load 15 such as a speaker from the output terminal when the main power is supplied so that the uncomfortable shock sounds can be prevented.
COPYRIGHT: (C)1979,JPO&Japio
JP7008578A 1978-06-09 1978-06-09 Ac amplifying device Pending JPS54161305A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7008578A JPS54161305A (en) 1978-06-09 1978-06-09 Ac amplifying device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7008578A JPS54161305A (en) 1978-06-09 1978-06-09 Ac amplifying device

Publications (1)

Publication Number Publication Date
JPS54161305A true JPS54161305A (en) 1979-12-20

Family

ID=13421337

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7008578A Pending JPS54161305A (en) 1978-06-09 1978-06-09 Ac amplifying device

Country Status (1)

Country Link
JP (1) JPS54161305A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57118409A (en) * 1981-01-14 1982-07-23 Hitachi Ltd Amplifying circuit
JPS5973818U (en) * 1982-11-10 1984-05-19 三洋電機株式会社 Shock noise prevention circuit
JP2007214633A (en) * 2006-02-07 2007-08-23 Matsushita Electric Ind Co Ltd Pop noise reduction circuit
JP2013110726A (en) * 2011-10-24 2013-06-06 Rohm Co Ltd Audio signal processing circuit and electronic apparatus using the same

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57118409A (en) * 1981-01-14 1982-07-23 Hitachi Ltd Amplifying circuit
JPS5973818U (en) * 1982-11-10 1984-05-19 三洋電機株式会社 Shock noise prevention circuit
JPH0352024Y2 (en) * 1982-11-10 1991-11-11
JP2007214633A (en) * 2006-02-07 2007-08-23 Matsushita Electric Ind Co Ltd Pop noise reduction circuit
JP2013110726A (en) * 2011-10-24 2013-06-06 Rohm Co Ltd Audio signal processing circuit and electronic apparatus using the same

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