JPS5744312A - Automatic level control circuit - Google Patents

Automatic level control circuit

Info

Publication number
JPS5744312A
JPS5744312A JP11020981A JP11020981A JPS5744312A JP S5744312 A JPS5744312 A JP S5744312A JP 11020981 A JP11020981 A JP 11020981A JP 11020981 A JP11020981 A JP 11020981A JP S5744312 A JPS5744312 A JP S5744312A
Authority
JP
Japan
Prior art keywords
current
amplifier
supplied
trs
level control
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
JP11020981A
Other languages
Japanese (ja)
Other versions
JPS6133483B2 (en
Inventor
Hiroyasu Yamaguchi
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 JP11020981A priority Critical patent/JPS5744312A/en
Publication of JPS5744312A publication Critical patent/JPS5744312A/en
Publication of JPS6133483B2 publication Critical patent/JPS6133483B2/ja
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G3/00—Gain control in amplifiers or frequency changers without distortion of the input signal
    • 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
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G3/00—Gain control in amplifiers or frequency changers without distortion of the input signal
    • H03G3/20—Automatic control

Abstract

PURPOSE:To reduce temperature dependency and to make a set level freely variable by comparing a detected current with a constant reference current and by controlling an input level with a current which corresponds to a comparison difference when the detected current is greater. CONSTITUTION:A signal from a signal source ES is supplied to an amplifier A1 through a capacitor C1 and a resistance R1, and the output of the amplifier A1 is supplied to an output terminal OUT and also supplied to a transistor (TR) Q6 and an amplifier B1 constituting a rectifying circuit Rec through a resistance R3. The detected current (i) of the rectifying circuit Rec is compared with a current I flowing through a current source circuit Is composed of TRs Q7 and Q8 and when i>I, a current i-I is outputted and, after integrated by a capacitor C, drives TRs Q1 and Q2. Then, a variable impedance circuit VI composed of TRs Q3, Q4, and Q5 connected to the collector of a TRQ2 is driven to exercise automatic level control.
JP11020981A 1981-07-15 1981-07-15 Automatic level control circuit Granted JPS5744312A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP11020981A JPS5744312A (en) 1981-07-15 1981-07-15 Automatic level control circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11020981A JPS5744312A (en) 1981-07-15 1981-07-15 Automatic level control circuit

Publications (2)

Publication Number Publication Date
JPS5744312A true JPS5744312A (en) 1982-03-12
JPS6133483B2 JPS6133483B2 (en) 1986-08-02

Family

ID=14529816

Family Applications (1)

Application Number Title Priority Date Filing Date
JP11020981A Granted JPS5744312A (en) 1981-07-15 1981-07-15 Automatic level control circuit

Country Status (1)

Country Link
JP (1) JPS5744312A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59207716A (en) * 1983-05-10 1984-11-24 Sanyo Electric Co Ltd Automatic level controlling circuit
JPS61217371A (en) * 1985-03-08 1986-09-26 昭和炭酸株式会社 Conservative housing body for food mildewproofing
US5304946A (en) * 1990-10-19 1994-04-19 Hitachi, Ltd. Amplifier circuit having an operation point maintaining input and output voltages constant even if a gain thereof is varied
JP2001308663A (en) * 2000-04-27 2001-11-02 New Japan Radio Co Ltd Variable gain amplifier circuit

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59207716A (en) * 1983-05-10 1984-11-24 Sanyo Electric Co Ltd Automatic level controlling circuit
JPH057886B2 (en) * 1983-05-10 1993-01-29 Sanyo Electric Co
JPS61217371A (en) * 1985-03-08 1986-09-26 昭和炭酸株式会社 Conservative housing body for food mildewproofing
US5304946A (en) * 1990-10-19 1994-04-19 Hitachi, Ltd. Amplifier circuit having an operation point maintaining input and output voltages constant even if a gain thereof is varied
JP2001308663A (en) * 2000-04-27 2001-11-02 New Japan Radio Co Ltd Variable gain amplifier circuit
JP4516177B2 (en) * 2000-04-27 2010-08-04 新日本無線株式会社 Variable gain amplifier circuit

Also Published As

Publication number Publication date
JPS6133483B2 (en) 1986-08-02

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