JPS5696513A - Gain control circuit - Google Patents

Gain control circuit

Info

Publication number
JPS5696513A
JPS5696513A JP17078879A JP17078879A JPS5696513A JP S5696513 A JPS5696513 A JP S5696513A JP 17078879 A JP17078879 A JP 17078879A JP 17078879 A JP17078879 A JP 17078879A JP S5696513 A JPS5696513 A JP S5696513A
Authority
JP
Japan
Prior art keywords
voltage
resistor
given
point
control circuit
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
JP17078879A
Other languages
Japanese (ja)
Inventor
Takafumi Okada
Hajime Nakajima
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.)
Sony Corp
Original Assignee
Sony 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 Sony Corp filed Critical Sony Corp
Priority to JP17078879A priority Critical patent/JPS5696513A/en
Publication of JPS5696513A publication Critical patent/JPS5696513A/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
    • H03G3/3026—Automatic control in amplifiers having semiconductor devices in amplifiers suitable for low-frequencies, e.g. audio amplifiers the gain being discontinuously variable, e.g. controlled by switching

Landscapes

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

Abstract

PURPOSE:To obtain the characteristics with an arbitrary slope simply, which has a point of inflection at an arbitrary point, by constituting that a transistor turns on when a voltage given to an input terminal exceeds a range. CONSTITUTION:When a voltage V1 given to an input terminal 11 is smaller than a given value, since a voltage drop across a resistor 22 is small, a transistor TR32 is off, and a voltage V0 at an output terminal 19 is in proportion to a voltage V1 with a slope. When the voltage V1 is increased from a given value, TR32 is on with the voltage drop across the resistor 22, and a current flowing to a resistor 42 and TR32 flows to a load RL and the voltage V0 rapidly rises. Thus, the characteristics between the voltages V1 and V0 are curved at a point.
JP17078879A 1979-12-29 1979-12-29 Gain control circuit Pending JPS5696513A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP17078879A JPS5696513A (en) 1979-12-29 1979-12-29 Gain control circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP17078879A JPS5696513A (en) 1979-12-29 1979-12-29 Gain control circuit

Publications (1)

Publication Number Publication Date
JPS5696513A true JPS5696513A (en) 1981-08-04

Family

ID=15911369

Family Applications (1)

Application Number Title Priority Date Filing Date
JP17078879A Pending JPS5696513A (en) 1979-12-29 1979-12-29 Gain control circuit

Country Status (1)

Country Link
JP (1) JPS5696513A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5711512A (en) * 1980-06-25 1982-01-21 Toshiba Corp Sound volume balance control circuit

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS52107753A (en) * 1976-03-05 1977-09-09 Matsushita Electric Ind Co Ltd Gain control circuit

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS52107753A (en) * 1976-03-05 1977-09-09 Matsushita Electric Ind Co Ltd Gain control circuit

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5711512A (en) * 1980-06-25 1982-01-21 Toshiba Corp Sound volume balance control circuit

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