JPS5566109A - Amplifier - Google Patents

Amplifier

Info

Publication number
JPS5566109A
JPS5566109A JP13882278A JP13882278A JPS5566109A JP S5566109 A JPS5566109 A JP S5566109A JP 13882278 A JP13882278 A JP 13882278A JP 13882278 A JP13882278 A JP 13882278A JP S5566109 A JPS5566109 A JP S5566109A
Authority
JP
Japan
Prior art keywords
amplifier
turned
resistance
opto
decided
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
JP13882278A
Other languages
Japanese (ja)
Inventor
Norikazu Shimazaki
Kazuhiro Hayama
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.)
KENSONITSUKU KK
Original Assignee
KENSONITSUKU KK
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 KENSONITSUKU KK filed Critical KENSONITSUKU KK
Priority to JP13882278A priority Critical patent/JPS5566109A/en
Publication of JPS5566109A publication Critical patent/JPS5566109A/en
Pending 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
    • H03F3/20—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers

Landscapes

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

Abstract

PURPOSE:To avoid the interference with other circuits and occurrence of unsteadiness due to the floating capacity for the amplifier containing the bias circuit by securing the electric isolation for the bias change-over switch via the opto-coupler in the amplifier. CONSTITUTION:For the amplifier conatining bias circuit 4, light emitting diode D2 has no light emission in opto-coupler OC along with photo transistor Q3 turned off each when switch S1 is off. Thus transistor Q4 is biased via resistance R7 to be turned on, and the base bias value of transistors Q1 and Q2 are decided by resistance R5. Then with S1 turned on, diode D2 emits the light to turn Q3 on and Q4 off respectively, and thus the base bias value of Q1 and Q2 are decided by resistance R5 and R6. Then R5 and R<6> are set properly and with S1 turned on and off, and as a result the amplifier can feature the optional amplifying action from the A-class to B-class amplification.
JP13882278A 1978-11-13 1978-11-13 Amplifier Pending JPS5566109A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP13882278A JPS5566109A (en) 1978-11-13 1978-11-13 Amplifier

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP13882278A JPS5566109A (en) 1978-11-13 1978-11-13 Amplifier

Publications (1)

Publication Number Publication Date
JPS5566109A true JPS5566109A (en) 1980-05-19

Family

ID=15231029

Family Applications (1)

Application Number Title Priority Date Filing Date
JP13882278A Pending JPS5566109A (en) 1978-11-13 1978-11-13 Amplifier

Country Status (1)

Country Link
JP (1) JPS5566109A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01150915A (en) * 1987-12-08 1989-06-13 Fujitsu Ltd Servo positioning control device
JPH01150916A (en) * 1987-12-08 1989-06-13 Fujitsu Ltd Servo positioning control device

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS545794B2 (en) * 1974-06-29 1979-03-20

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS545794B2 (en) * 1974-06-29 1979-03-20

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01150915A (en) * 1987-12-08 1989-06-13 Fujitsu Ltd Servo positioning control device
JPH01150916A (en) * 1987-12-08 1989-06-13 Fujitsu Ltd Servo positioning control device

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