JPS5721105A - Audio power amplifier - Google Patents

Audio power amplifier

Info

Publication number
JPS5721105A
JPS5721105A JP9495680A JP9495680A JPS5721105A JP S5721105 A JPS5721105 A JP S5721105A JP 9495680 A JP9495680 A JP 9495680A JP 9495680 A JP9495680 A JP 9495680A JP S5721105 A JPS5721105 A JP S5721105A
Authority
JP
Japan
Prior art keywords
speaker
amplifier
input terminal
negative feedback
type
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
JP9495680A
Other languages
Japanese (ja)
Inventor
Harushige Nakagaki
Shigeki Inoue
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 JP9495680A priority Critical patent/JPS5721105A/en
Publication of JPS5721105A publication Critical patent/JPS5721105A/en
Pending legal-status Critical Current

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  • Amplifiers (AREA)

Abstract

PURPOSE: To enable voltage drive for any type of speaker, by operating limited speakers as a series negative feedback circuit of current driving type through switching and operating other speakers as a parallel negative feedback circuit of voltage driving type.
CONSTITUTION: When a speaker 4 is a limited and specified type, a switch 21 is closed and switches 20, 22 are opened. In this case, an input ei applied to an input terminal 1 is inputted to an amplifier 2 via peak suppressors 6, 7, and series negative feedback is made since a current signal is fed back to an inverting input terminal of an amplifier 2 and a specified current proportional to the input ei is applied to the speaker 4. On the other hand, to perform voltage drive of the speaker 4, the switch 21 is opened and switches 20, 22 are closed. In this case, since a voltage signal is fed back to the inverting input terminal of the amplifier 2, parallel feedback is made and the speaker 4 is in voltage drive.
COPYRIGHT: (C)1982,JPO&Japio
JP9495680A 1980-07-14 1980-07-14 Audio power amplifier Pending JPS5721105A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP9495680A JPS5721105A (en) 1980-07-14 1980-07-14 Audio power amplifier

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9495680A JPS5721105A (en) 1980-07-14 1980-07-14 Audio power amplifier

Publications (1)

Publication Number Publication Date
JPS5721105A true JPS5721105A (en) 1982-02-03

Family

ID=14124377

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9495680A Pending JPS5721105A (en) 1980-07-14 1980-07-14 Audio power amplifier

Country Status (1)

Country Link
JP (1) JPS5721105A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5921108A (en) * 1982-07-26 1984-02-03 Sony Corp Power amplifier having constant current output characteristic
JPS59189317U (en) * 1983-06-02 1984-12-15 三菱電機株式会社 current amplifier

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5921108A (en) * 1982-07-26 1984-02-03 Sony Corp Power amplifier having constant current output characteristic
JPS59189317U (en) * 1983-06-02 1984-12-15 三菱電機株式会社 current amplifier

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