JPS5666910A - Protection circuit for amplifier - Google Patents

Protection circuit for amplifier

Info

Publication number
JPS5666910A
JPS5666910A JP14291879A JP14291879A JPS5666910A JP S5666910 A JPS5666910 A JP S5666910A JP 14291879 A JP14291879 A JP 14291879A JP 14291879 A JP14291879 A JP 14291879A JP S5666910 A JPS5666910 A JP S5666910A
Authority
JP
Japan
Prior art keywords
transistor
line
aso
protection line
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
JP14291879A
Other languages
Japanese (ja)
Other versions
JPS61722B2 (en
Inventor
Norio Ishiguro
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 Columbia Co Ltd
Original Assignee
Nippon Columbia 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 Columbia Co Ltd filed Critical Nippon Columbia Co Ltd
Priority to JP14291879A priority Critical patent/JPS5666910A/en
Publication of JPS5666910A publication Critical patent/JPS5666910A/en
Publication of JPS61722B2 publication Critical patent/JPS61722B2/ja
Granted 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)

Abstract

PURPOSE:To prevent the production of unnecessary protective operation, by approaching the operating point to protect the output transistor to ASO line. CONSTITUTION:With a transistor 19 on, when a voltage between collector and emitter fed to the transistor exceeds the power supply voltage, a diode 13 is off, a transistor 15 is on and the input voltage of a transistor 3 is interrupted. Accordingly, the collector current of the transistor 3 to turn on the transistor 15 can be obtained from resistors 5, 9, 17, and the operating point for protective operation can be made to the protection line C closer to the ASO line A. The protection line has a cross point S with the ASO line, if nothing is done. The protection line C is made in coincidence with the conventional protection line B, by adjusting resistors 21, 23 so that transistors 19, 20 can be off on the cross point S, for this purpose.
JP14291879A 1979-11-05 1979-11-05 Protection circuit for amplifier Granted JPS5666910A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP14291879A JPS5666910A (en) 1979-11-05 1979-11-05 Protection circuit for amplifier

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP14291879A JPS5666910A (en) 1979-11-05 1979-11-05 Protection circuit for amplifier

Publications (2)

Publication Number Publication Date
JPS5666910A true JPS5666910A (en) 1981-06-05
JPS61722B2 JPS61722B2 (en) 1986-01-10

Family

ID=15326644

Family Applications (1)

Application Number Title Priority Date Filing Date
JP14291879A Granted JPS5666910A (en) 1979-11-05 1979-11-05 Protection circuit for amplifier

Country Status (1)

Country Link
JP (1) JPS5666910A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5858619A (en) * 1981-10-01 1983-04-07 Pioneer Electronic Corp Overcurrent protecting circuit of push-pull amplifier
JPS5868307A (en) * 1981-10-19 1983-04-23 Pioneer Electronic Corp Overcurrent protecting circuit for push-pull amplifier
JPS5868306A (en) * 1981-10-19 1983-04-23 Pioneer Electronic Corp Overcurrent protecting circuit for push-pull amplifier

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62219019A (en) * 1986-03-19 1987-09-26 Canon Inc Miniature key input device
JPH02146686U (en) * 1989-05-09 1990-12-12

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5858619A (en) * 1981-10-01 1983-04-07 Pioneer Electronic Corp Overcurrent protecting circuit of push-pull amplifier
JPS5868307A (en) * 1981-10-19 1983-04-23 Pioneer Electronic Corp Overcurrent protecting circuit for push-pull amplifier
JPS5868306A (en) * 1981-10-19 1983-04-23 Pioneer Electronic Corp Overcurrent protecting circuit for push-pull amplifier

Also Published As

Publication number Publication date
JPS61722B2 (en) 1986-01-10

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