JPS5238212A - Recording amplifier - Google Patents

Recording amplifier

Info

Publication number
JPS5238212A
JPS5238212A JP11374975A JP11374975A JPS5238212A JP S5238212 A JPS5238212 A JP S5238212A JP 11374975 A JP11374975 A JP 11374975A JP 11374975 A JP11374975 A JP 11374975A JP S5238212 A JPS5238212 A JP S5238212A
Authority
JP
Japan
Prior art keywords
recording amplifier
microphone
amplifier
feedback
decrease
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
JP11374975A
Other languages
Japanese (ja)
Inventor
Takashi 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.)
Ricoh Co Ltd
Original Assignee
Ricoh 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 Ricoh Co Ltd filed Critical Ricoh Co Ltd
Priority to JP11374975A priority Critical patent/JPS5238212A/en
Priority to GB3882876A priority patent/GB1565974A/en
Publication of JPS5238212A publication Critical patent/JPS5238212A/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
    • H03F1/34—Negative-feedback-circuit arrangements with or without positive feedback
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/02—Recording, reproducing, or erasing methods; Read, write or erase circuits therefor
    • 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
    • H03F1/30—Modifications of amplifiers to reduce influence of variations of temperature or supply voltage or other physical parameters
    • H03F1/302—Modifications of amplifiers to reduce influence of variations of temperature or supply voltage or other physical parameters in bipolar transistor amplifiers
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/181—Low-frequency amplifiers, e.g. audio preamplifiers
    • H03F3/183—Low-frequency amplifiers, e.g. audio preamplifiers with semiconductor devices only
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G3/00—Gain control in amplifiers or frequency changers
    • H03G3/20—Automatic control
    • H03G3/30—Automatic control in amplifiers having semiconductor devices
    • H03G3/3005—Automatic control in amplifiers having semiconductor devices in amplifiers suitable for low-frequencies, e.g. audio amplifiers

Landscapes

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

Abstract

PURPOSE: To improve the frequency response and decrease the weight of the amplifier by applying a DC feedback between the microphone and the multistage amplifier connected directly to the microphone.
COPYRIGHT: (C)1977,JPO&Japio
JP11374975A 1975-09-22 1975-09-22 Recording amplifier Pending JPS5238212A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP11374975A JPS5238212A (en) 1975-09-22 1975-09-22 Recording amplifier
GB3882876A GB1565974A (en) 1975-09-22 1976-09-20 Recording amplifiers for magnetic tape recorders

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11374975A JPS5238212A (en) 1975-09-22 1975-09-22 Recording amplifier

Publications (1)

Publication Number Publication Date
JPS5238212A true JPS5238212A (en) 1977-03-24

Family

ID=14620137

Family Applications (1)

Application Number Title Priority Date Filing Date
JP11374975A Pending JPS5238212A (en) 1975-09-22 1975-09-22 Recording amplifier

Country Status (2)

Country Link
JP (1) JPS5238212A (en)
GB (1) GB1565974A (en)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4517844Y1 (en) * 1965-07-03 1970-07-22

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4517844Y1 (en) * 1965-07-03 1970-07-22

Also Published As

Publication number Publication date
GB1565974A (en) 1980-04-23

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