JPS57171811A - Variable attenuating circuit - Google Patents

Variable attenuating circuit

Info

Publication number
JPS57171811A
JPS57171811A JP5739881A JP5739881A JPS57171811A JP S57171811 A JPS57171811 A JP S57171811A JP 5739881 A JP5739881 A JP 5739881A JP 5739881 A JP5739881 A JP 5739881A JP S57171811 A JPS57171811 A JP S57171811A
Authority
JP
Japan
Prior art keywords
circuit
signal
inputted
collector
output
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
JP5739881A
Other languages
Japanese (ja)
Inventor
Makoto Mikuriya
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.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
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 Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP5739881A priority Critical patent/JPS57171811A/en
Publication of JPS57171811A publication Critical patent/JPS57171811A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G1/00—Details of arrangements for controlling amplification
    • H03G1/0005—Circuits characterised by the type of controlling devices operated by a controlling current or voltage signal
    • H03G1/0035—Circuits characterised by the type of controlling devices operated by a controlling current or voltage signal using continuously variable impedance elements
    • H03G1/0082—Circuits characterised by the type of controlling devices operated by a controlling current or voltage signal using continuously variable impedance elements using bipolar transistor-type devices

Landscapes

  • Control Of Amplification And Gain Control (AREA)

Abstract

PURPOSE:To obtain a variable attenuating circuit which generates a distortion- free output by cascading a variable attenuator which divides the voltage of an input audio signal by a resistance and the emitter-collector resistance of a transistor (TR), and inserting an amplifying circuit having a -1 grain. CONSTITUTION:An input audio signal is inputted to an attenuating circuit A1 and then supplied to an attenuating circuit A2 through an amplifying circuit 9 having a -1 gain, outputting a signal whose attenuation amount is varied. The signal inputted to the circuit A1 is connected to the collector of a TR8 through a capacitor 5 for DC component removal and a series resistance 7, and its voltage division output is led out through a capacitor 6 for DC component removal. Further, the characteristics of the circuit A2 are set equal to those of the circuit A1. The mitter-collector resistances of TRs 8 and 13 are varied by controlling their base currents by a control signal. Thus, the output of the circuit A1 is inverted and inputted to the circuit A2 to obtain a distortion-free output without reference to the polarity of the input signal.
JP5739881A 1981-04-15 1981-04-15 Variable attenuating circuit Pending JPS57171811A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP5739881A JPS57171811A (en) 1981-04-15 1981-04-15 Variable attenuating circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5739881A JPS57171811A (en) 1981-04-15 1981-04-15 Variable attenuating circuit

Publications (1)

Publication Number Publication Date
JPS57171811A true JPS57171811A (en) 1982-10-22

Family

ID=13054522

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5739881A Pending JPS57171811A (en) 1981-04-15 1981-04-15 Variable attenuating circuit

Country Status (1)

Country Link
JP (1) JPS57171811A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2018011281A (en) * 2016-07-11 2018-01-18 正仁 櫨田 Volume circuit without mechanical drive part linearly heard on audibility

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2018011281A (en) * 2016-07-11 2018-01-18 正仁 櫨田 Volume circuit without mechanical drive part linearly heard on audibility

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