JPS57141114A - Output characteristic control circuit of amplifier - Google Patents

Output characteristic control circuit of amplifier

Info

Publication number
JPS57141114A
JPS57141114A JP56026284A JP2628481A JPS57141114A JP S57141114 A JPS57141114 A JP S57141114A JP 56026284 A JP56026284 A JP 56026284A JP 2628481 A JP2628481 A JP 2628481A JP S57141114 A JPS57141114 A JP S57141114A
Authority
JP
Japan
Prior art keywords
amplifier
frequency band
feedback
circuit
input side
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
JP56026284A
Other languages
Japanese (ja)
Inventor
Mitsugi Oiwa
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.)
Nippon Gakki Co Ltd
Original Assignee
Nippon Gakki 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 Nippon Gakki Co Ltd filed Critical Nippon Gakki Co Ltd
Priority to JP56026284A priority Critical patent/JPS57141114A/en
Publication of JPS57141114A publication Critical patent/JPS57141114A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G5/00—Tone control or bandwidth control in amplifiers
    • H03G5/16—Automatic control

Landscapes

  • Tone Control, Compression And Expansion, Limiting Amplitude (AREA)
  • Amplifiers (AREA)

Abstract

PURPOSE:To adjust sound quality of every frequency band by feeding the detection output of a load current detecting circuit back to the input side of an amplifier through a feedback circuit capable of varying the extent of feedback optionally in every frequency band. CONSTITUTION:The detection output of a load current detecting circuit is fed back to the input side of an amplifier through a feedback circuit A. The output impedance Z0 of the amplifier to which the feedback is provided through a transfer circuit 11 is as shown by equation. Therefore, the output impedance Z0 is variable with the value of a variable resistance 11e in a high frequency band, and with the value of a variable resistance 11g in a low frequency band. The output of the load current detecting circuit is fed back to the input side of the amplifier through this feedback circuit A.
JP56026284A 1981-02-25 1981-02-25 Output characteristic control circuit of amplifier Pending JPS57141114A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56026284A JPS57141114A (en) 1981-02-25 1981-02-25 Output characteristic control circuit of amplifier

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56026284A JPS57141114A (en) 1981-02-25 1981-02-25 Output characteristic control circuit of amplifier

Publications (1)

Publication Number Publication Date
JPS57141114A true JPS57141114A (en) 1982-09-01

Family

ID=12188984

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56026284A Pending JPS57141114A (en) 1981-02-25 1981-02-25 Output characteristic control circuit of amplifier

Country Status (1)

Country Link
JP (1) JPS57141114A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5922408A (en) * 1982-07-28 1984-02-04 Pioneer Electronic Corp Power amplifying circuit
JPH06232643A (en) * 1993-02-05 1994-08-19 Nec Corp Feedback amplifier circuit
WO2006114944A1 (en) * 2005-04-21 2006-11-02 Hamamatsu Photonics K.K. Current variation measuring apparatus

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5922408A (en) * 1982-07-28 1984-02-04 Pioneer Electronic Corp Power amplifying circuit
JPH06232643A (en) * 1993-02-05 1994-08-19 Nec Corp Feedback amplifier circuit
WO2006114944A1 (en) * 2005-04-21 2006-11-02 Hamamatsu Photonics K.K. Current variation measuring apparatus

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