JPS5665511A - Indicating circuit for state of a-class and b-class amplifying operation of power amplifier - Google Patents

Indicating circuit for state of a-class and b-class amplifying operation of power amplifier

Info

Publication number
JPS5665511A
JPS5665511A JP14231279A JP14231279A JPS5665511A JP S5665511 A JPS5665511 A JP S5665511A JP 14231279 A JP14231279 A JP 14231279A JP 14231279 A JP14231279 A JP 14231279A JP S5665511 A JPS5665511 A JP S5665511A
Authority
JP
Japan
Prior art keywords
class
signal
state
light emitting
power amplifier
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.)
Granted
Application number
JP14231279A
Other languages
Japanese (ja)
Other versions
JPS6237843B2 (en
Inventor
Terufumi Hino
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.)
Sharp Corp
Original Assignee
Sharp Corp
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 Sharp Corp filed Critical Sharp Corp
Priority to JP14231279A priority Critical patent/JPS5665511A/en
Publication of JPS5665511A publication Critical patent/JPS5665511A/en
Publication of JPS6237843B2 publication Critical patent/JPS6237843B2/ja
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/72—Gated amplifiers, i.e. amplifiers which are rendered operative or inoperative by means of a control signal

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Amplifiers (AREA)

Abstract

PURPOSE:To indicate the state of amplifying operation of A-class and B-class of a power amplifier so that visual observation can be made by driving different light emitting diodes at the A-class and B-class operations. CONSTITUTION:In case of class A amplification, when an AC signal S1 is produced at the emitter electrode of a power transistor Q1, since similar AC signal S2 is produced at a common connection B also, no output is caused at an operational amplifier IC1 and the output of an operational amplifier IC2 is lower than the potential at the anode side of a light emitting diode D2, allowing to conduct the diode D2. Further, in case of B-class amplification, the AC signal S1 is not changed toward negative side and the AC signal S2 is changed toward negative side, then the amplifiers IC1, IC2 output a positive voltage to conduct the light emitting diode D1.
JP14231279A 1979-11-01 1979-11-01 Indicating circuit for state of a-class and b-class amplifying operation of power amplifier Granted JPS5665511A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP14231279A JPS5665511A (en) 1979-11-01 1979-11-01 Indicating circuit for state of a-class and b-class amplifying operation of power amplifier

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP14231279A JPS5665511A (en) 1979-11-01 1979-11-01 Indicating circuit for state of a-class and b-class amplifying operation of power amplifier

Publications (2)

Publication Number Publication Date
JPS5665511A true JPS5665511A (en) 1981-06-03
JPS6237843B2 JPS6237843B2 (en) 1987-08-14

Family

ID=15312421

Family Applications (1)

Application Number Title Priority Date Filing Date
JP14231279A Granted JPS5665511A (en) 1979-11-01 1979-11-01 Indicating circuit for state of a-class and b-class amplifying operation of power amplifier

Country Status (1)

Country Link
JP (1) JPS5665511A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5883818U (en) * 1981-12-03 1983-06-07 三洋電機株式会社 Class A amplifier operating status display circuit

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4991567A (en) * 1972-12-30 1974-09-02
JPS5132248U (en) * 1974-08-31 1976-03-09

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4991567A (en) * 1972-12-30 1974-09-02
JPS5132248U (en) * 1974-08-31 1976-03-09

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5883818U (en) * 1981-12-03 1983-06-07 三洋電機株式会社 Class A amplifier operating status display circuit

Also Published As

Publication number Publication date
JPS6237843B2 (en) 1987-08-14

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