JPS56152306A - Speaker protector - Google Patents

Speaker protector

Info

Publication number
JPS56152306A
JPS56152306A JP5476580A JP5476580A JPS56152306A JP S56152306 A JPS56152306 A JP S56152306A JP 5476580 A JP5476580 A JP 5476580A JP 5476580 A JP5476580 A JP 5476580A JP S56152306 A JPS56152306 A JP S56152306A
Authority
JP
Japan
Prior art keywords
output
speaker
level
speaker side
supplied
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
JP5476580A
Other languages
Japanese (ja)
Inventor
Hideo Tomabechi
Nobuo Terui
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.)
Olympus Corp
Original Assignee
Olympus Optical 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 Olympus Optical Co Ltd filed Critical Olympus Optical Co Ltd
Priority to JP5476580A priority Critical patent/JPS56152306A/en
Publication of JPS56152306A publication Critical patent/JPS56152306A/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
    • H03F1/52—Circuit arrangements for protecting such amplifiers

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Amplifiers (AREA)
  • Circuit For Audible Band Transducer (AREA)

Abstract

PURPOSE:To restrain the excessive output of the speaker, by making it possible to vary the restraint level of the upper limit of the output supplied to the speaker. CONSTITUTION:When the voice output is generated from driver circuit 1, it is amplified by Darlington connection circuits 21 and 22 and is given to the speaker side. The output supplied to the speaker side is detected by detecting parts 31 and 32; and when the control output reaches the level where transistors T31 and T32 of control parts 41 and 42 are turned on, the output to the speaker side is restrained.
JP5476580A 1980-04-24 1980-04-24 Speaker protector Pending JPS56152306A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP5476580A JPS56152306A (en) 1980-04-24 1980-04-24 Speaker protector

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5476580A JPS56152306A (en) 1980-04-24 1980-04-24 Speaker protector

Publications (1)

Publication Number Publication Date
JPS56152306A true JPS56152306A (en) 1981-11-25

Family

ID=12979860

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5476580A Pending JPS56152306A (en) 1980-04-24 1980-04-24 Speaker protector

Country Status (1)

Country Link
JP (1) JPS56152306A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1987000709A1 (en) * 1985-07-22 1987-01-29 Charters, John, Dumergue Composite audio amplifier
JPS62188598A (en) * 1986-02-14 1987-08-18 Nec Home Electronics Ltd Voice output circuit
US7888907B2 (en) 2007-10-30 2011-02-15 Bose Corporation Controlled charging and use of power source
US8073154B2 (en) 2003-07-15 2011-12-06 Bose Corporation Supplying electrical power

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1987000709A1 (en) * 1985-07-22 1987-01-29 Charters, John, Dumergue Composite audio amplifier
JPS62188598A (en) * 1986-02-14 1987-08-18 Nec Home Electronics Ltd Voice output circuit
US8073154B2 (en) 2003-07-15 2011-12-06 Bose Corporation Supplying electrical power
US7888907B2 (en) 2007-10-30 2011-02-15 Bose Corporation Controlled charging and use of power source

Similar Documents

Publication Publication Date Title
JPS5341218A (en) Speaker protecting circuit
JPS56152306A (en) Speaker protector
KR880010561A (en) Voice Output Amplifier
JPS56117409A (en) Amplifying device
EP0259218A3 (en) Circuit arrangement for providing isolation between the transmission paths of a hands-free subset
JPS56111307A (en) Amplifying device
DE3169264D1 (en) Circuit arrangement for load-proportional regulation of the control current of the emitter-connected output stage transistor of a transistor amplifier
JPS5353279A (en) Semiconductor integrating circuit
JPS5514774A (en) Output limit amplifier circuit
JPS5531381A (en) Interphone device
JPS55125795A (en) Protection unit for moving coil type electromechanical converter
DE3168450D1 (en) Process for stabilising the current gain of npn transistors
JPS5248740A (en) No-constact ignition device
JPS5426608A (en) Howling prevention unit
JPS57123707A (en) Integrated circuit device with amplifying gain stabilizing function
JPS5376651A (en) Amplifier
JPS5426611A (en) Howling prevention unit
JPS5366141A (en) Power amplifier
JPS5627557A (en) Side-tone preventing circuit
JPS56153996A (en) Controlling device for motor
JPS52100225A (en) Protecting circuit for speaker
JPS5753106A (en) Muting circuit
JPS5392657A (en) Transistor circuit
JPS5360138A (en) Peak holding circuit
JPS5352342A (en) Differential amplifier circuit