JPS56123111A - Muting circuit - Google Patents

Muting circuit

Info

Publication number
JPS56123111A
JPS56123111A JP2654680A JP2654680A JPS56123111A JP S56123111 A JPS56123111 A JP S56123111A JP 2654680 A JP2654680 A JP 2654680A JP 2654680 A JP2654680 A JP 2654680A JP S56123111 A JPS56123111 A JP S56123111A
Authority
JP
Japan
Prior art keywords
transistor
turns
voltage
power
muting
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
JP2654680A
Other languages
Japanese (ja)
Inventor
Tetsuo Sato
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.)
Hitachi Ltd
Original Assignee
Hitachi 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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP2654680A priority Critical patent/JPS56123111A/en
Publication of JPS56123111A publication Critical patent/JPS56123111A/en
Pending legal-status Critical Current

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  • Amplifiers (AREA)

Abstract

PURPOSE: To prevent automatically a pop sound generated when the power source is turned on and off, by controlling a muting transistor by using the output of a transistor which turns off at a power voltage lower than a prescribed voltage.
CONSTITUTION: When power voltage VCC reaches 2VBE as the power source is turned on, transistors Q2 and Q3 turn on to start muting operation. When power voltage VCC reaches detection voltage (VZ+VF) (where VZ is a Zener voltage and VF the threshold voltage of a diode), a current flows through diode D2 and transistor Q1 turns on. Therefore, transistor Q2 turns off and transistor Q1 turns off, so that the muting operation will end.
COPYRIGHT: (C)1981,JPO&Japio
JP2654680A 1980-03-05 1980-03-05 Muting circuit Pending JPS56123111A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2654680A JPS56123111A (en) 1980-03-05 1980-03-05 Muting circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2654680A JPS56123111A (en) 1980-03-05 1980-03-05 Muting circuit

Publications (1)

Publication Number Publication Date
JPS56123111A true JPS56123111A (en) 1981-09-28

Family

ID=12196500

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2654680A Pending JPS56123111A (en) 1980-03-05 1980-03-05 Muting circuit

Country Status (1)

Country Link
JP (1) JPS56123111A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59230306A (en) * 1983-06-14 1984-12-24 Matsushita Electric Ind Co Ltd Muting circuit
JPS6451807A (en) * 1987-08-24 1989-02-28 Matsushita Electric Industrial Co Ltd Muting circuit
US5442617A (en) * 1992-09-16 1995-08-15 Samsung Electronics Co., Ltd. Digital noise blanking circuit of CD-ROM system
JP2002026663A (en) * 2000-07-11 2002-01-25 New Japan Radio Co Ltd Bias circuit for audio amplifier

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS54161304A (en) * 1978-06-09 1979-12-20 Nec Corp Amplifying device
JPS5579512A (en) * 1978-12-12 1980-06-16 Matsushita Electric Ind Co Ltd Muting circuit

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS54161304A (en) * 1978-06-09 1979-12-20 Nec Corp Amplifying device
JPS5579512A (en) * 1978-12-12 1980-06-16 Matsushita Electric Ind Co Ltd Muting circuit

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59230306A (en) * 1983-06-14 1984-12-24 Matsushita Electric Ind Co Ltd Muting circuit
JPS6451807A (en) * 1987-08-24 1989-02-28 Matsushita Electric Industrial Co Ltd Muting circuit
US5442617A (en) * 1992-09-16 1995-08-15 Samsung Electronics Co., Ltd. Digital noise blanking circuit of CD-ROM system
JP2002026663A (en) * 2000-07-11 2002-01-25 New Japan Radio Co Ltd Bias circuit for audio amplifier

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