JPS57121305A - Muting circuit - Google Patents

Muting circuit

Info

Publication number
JPS57121305A
JPS57121305A JP56005866A JP586681A JPS57121305A JP S57121305 A JPS57121305 A JP S57121305A JP 56005866 A JP56005866 A JP 56005866A JP 586681 A JP586681 A JP 586681A JP S57121305 A JPS57121305 A JP S57121305A
Authority
JP
Japan
Prior art keywords
circuit
constant current
series
turned
voltage
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
JP56005866A
Other languages
Japanese (ja)
Other versions
JPH0345566B2 (en
Inventor
Yojiro Fukushima
Kinji Kawamoto
Hiromichi Shimada
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.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial 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 Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP56005866A priority Critical patent/JPS57121305A/en
Publication of JPS57121305A publication Critical patent/JPS57121305A/en
Publication of JPH0345566B2 publication Critical patent/JPH0345566B2/ja
Granted legal-status Critical Current

Links

Landscapes

  • Control Of Amplification And Gain Control (AREA)
  • Amplifiers (AREA)

Abstract

PURPOSE: To give the amplifying function to a muting circuit, by controlling current values of the first and the second constant current circuits, which are connected in series, by a control means where a parallel circuit consisting of a voltage element and a by-pass circuit is connected in series to the third constant current circuit.
CONSTITUTION: The first and the second constant current circuits 3 and 8 and the first and the second diodes 4 and 7 are connected in series to form a bias circuit. Emitters of the first and the second transistors (TR) 9 and 15 which obtain inputs from the bias circuit are connected mutually to form a current amplifying circuit. Further, a parallel circuit of constant voltage elements 18∼ 22 and a by-pass circuit 24 is connected in series to the third constant current circuit 23. When a switch 30 is opened, the by-pass circuit 24 is turned off, and the third constant current circuit 23 is turned on, and currents are flowed to the first and the second constant current circuits 3 and 8, and the output signal of a voltage amplifying part 2 is amplified by the first and the second TRs 9 and 15. When the switch 30 is closed, diodes 4 and 7 and TRs 9 and 12 are turned off, and the output of the voltage amplifying part 2 is cut off completely.
COPYRIGHT: (C)1982,JPO&Japio
JP56005866A 1981-01-20 1981-01-20 Muting circuit Granted JPS57121305A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56005866A JPS57121305A (en) 1981-01-20 1981-01-20 Muting circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56005866A JPS57121305A (en) 1981-01-20 1981-01-20 Muting circuit

Publications (2)

Publication Number Publication Date
JPS57121305A true JPS57121305A (en) 1982-07-28
JPH0345566B2 JPH0345566B2 (en) 1991-07-11

Family

ID=11622869

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56005866A Granted JPS57121305A (en) 1981-01-20 1981-01-20 Muting circuit

Country Status (1)

Country Link
JP (1) JPS57121305A (en)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS55133110A (en) * 1979-04-04 1980-10-16 Pioneer Electronic Corp Integrated circuit device
JPS55156405A (en) * 1979-05-25 1980-12-05 Hitachi Ltd Acoustic amplifying output circuit

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS55133110A (en) * 1979-04-04 1980-10-16 Pioneer Electronic Corp Integrated circuit device
JPS55156405A (en) * 1979-05-25 1980-12-05 Hitachi Ltd Acoustic amplifying output circuit

Also Published As

Publication number Publication date
JPH0345566B2 (en) 1991-07-11

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