JPS57135511A - Automatic level adjusting device - Google Patents

Automatic level adjusting device

Info

Publication number
JPS57135511A
JPS57135511A JP2104581A JP2104581A JPS57135511A JP S57135511 A JPS57135511 A JP S57135511A JP 2104581 A JP2104581 A JP 2104581A JP 2104581 A JP2104581 A JP 2104581A JP S57135511 A JPS57135511 A JP S57135511A
Authority
JP
Japan
Prior art keywords
voltage
amplifier
output
signal
recording signal
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
JP2104581A
Other languages
Japanese (ja)
Inventor
Hisao Hayashi
Hisashi Kato
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.)
Toshiba Corp
Original Assignee
Toshiba Corp
Tokyo Shibaura Electric 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 Toshiba Corp, Tokyo Shibaura Electric Co Ltd filed Critical Toshiba Corp
Priority to JP2104581A priority Critical patent/JPS57135511A/en
Publication of JPS57135511A publication Critical patent/JPS57135511A/en
Pending legal-status Critical Current

Links

Classifications

    • 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
    • H03G3/301—Automatic control in amplifiers having semiconductor devices in amplifiers suitable for low-frequencies, e.g. audio amplifiers the gain being continuously variable
    • H03G3/3015—Automatic control in amplifiers having semiconductor devices in amplifiers suitable for low-frequencies, e.g. audio amplifiers the gain being continuously variable using diodes or transistors

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Control Of Amplification And Gain Control (AREA)

Abstract

PURPOSE:To perform sufficient operation by using a low-voltage power source by amplifying a recording signal and turning on a transistor (TR), which permits an input signal to by-pass itself, by the amplification output. CONSTITUTION:A recording signal supplied to an input terminal 14 is amplified by a recording amplifier 15, whose output voltage is divided by resistances R4 and R5. A transistor (TR)Q4 amplifies and outputs the positive half-cycle part of the voltage-division output signal. Consequently, the collector voltage of the TRQ4 is charged in a capacitor C4 with a time constant prescribed by the capacitor and a resistance R7 and when the charged voltage becomes high enough to turn on a TRQ5, TRs Q5 and Q3 turn on to permit part of the recording signal to by-pass themselves. Therefore, the output level of the amplifier 15 is adjusted. Consequently, even when an outout voltage level from the amplifier 15 is low, sufficient level adjusting operation is achieved.
JP2104581A 1981-02-16 1981-02-16 Automatic level adjusting device Pending JPS57135511A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2104581A JPS57135511A (en) 1981-02-16 1981-02-16 Automatic level adjusting device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2104581A JPS57135511A (en) 1981-02-16 1981-02-16 Automatic level adjusting device

Publications (1)

Publication Number Publication Date
JPS57135511A true JPS57135511A (en) 1982-08-21

Family

ID=12043952

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2104581A Pending JPS57135511A (en) 1981-02-16 1981-02-16 Automatic level adjusting device

Country Status (1)

Country Link
JP (1) JPS57135511A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58157207A (en) * 1982-03-15 1983-09-19 Olympus Optical Co Ltd Automatic level controlling circuit
US6478143B1 (en) 1998-05-25 2002-11-12 Enomoto Industry Co., Ltd. Belt conveyor having support casing for belt

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58157207A (en) * 1982-03-15 1983-09-19 Olympus Optical Co Ltd Automatic level controlling circuit
JPH0432566B2 (en) * 1982-03-15 1992-05-29
US6478143B1 (en) 1998-05-25 2002-11-12 Enomoto Industry Co., Ltd. Belt conveyor having support casing for belt

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