JPS5769908A - Muting circuit - Google Patents

Muting circuit

Info

Publication number
JPS5769908A
JPS5769908A JP55147209A JP14720980A JPS5769908A JP S5769908 A JPS5769908 A JP S5769908A JP 55147209 A JP55147209 A JP 55147209A JP 14720980 A JP14720980 A JP 14720980A JP S5769908 A JPS5769908 A JP S5769908A
Authority
JP
Japan
Prior art keywords
trs
current
area ratio
emitter area
zero
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
JP55147209A
Other languages
Japanese (ja)
Other versions
JPH0212049B2 (en
Inventor
Yojiro Fukushima
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 JP55147209A priority Critical patent/JPS5769908A/en
Publication of JPS5769908A publication Critical patent/JPS5769908A/en
Publication of JPH0212049B2 publication Critical patent/JPH0212049B2/ja
Granted legal-status Critical Current

Links

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  • Amplifiers (AREA)

Abstract

PURPOSE: To extend usable cases by adding a current amplifying function to a muting circuit, and to make negligible the output offset by selecting the emitter area ratio of employed transistors as specified.
CONSTITUTION: When a switch 17 is closed, a current flows to a transistor (TR)15 with a resistor (R)16 and a power supply voltage to a TR3 via a current mirror A to give a suitable bias suitable for a current amplifying stage consisting of TRs9, 12 and Rs10, 11 by diodes D4, 7 and Rs5, 6. When the switch 17 is opened, the TRs 9, 12 and the Ds4, 7 are nonconductive for effective muting. In this case, when the emitter area ratio N1 of the TRs 15, 3 is selected greater than the product N2 of emitter area ratio of the TRs 15, 13 and the TRs 14, 8, the collector current of the TRs 3, 8 can be allowed to coincide, and when the output offset of a voltage amplifying section 2 is zero, the potential at an output terminal 19 is zero, allowing to solve problems on hfe of PNP and NPN elements.
COPYRIGHT: (C)1982,JPO&Japio
JP55147209A 1980-10-20 1980-10-20 Muting circuit Granted JPS5769908A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP55147209A JPS5769908A (en) 1980-10-20 1980-10-20 Muting circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP55147209A JPS5769908A (en) 1980-10-20 1980-10-20 Muting circuit

Publications (2)

Publication Number Publication Date
JPS5769908A true JPS5769908A (en) 1982-04-30
JPH0212049B2 JPH0212049B2 (en) 1990-03-16

Family

ID=15425025

Family Applications (1)

Application Number Title Priority Date Filing Date
JP55147209A Granted JPS5769908A (en) 1980-10-20 1980-10-20 Muting circuit

Country Status (1)

Country Link
JP (1) JPS5769908A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58191708U (en) * 1982-06-16 1983-12-20 パイオニア株式会社 Muting amplifier malfunction prevention circuit
JPS59138105A (en) * 1983-01-27 1984-08-08 Sony Corp Muting circuit

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3635617B2 (en) 1999-02-08 2005-04-06 本田技研工業株式会社 Tightening device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58191708U (en) * 1982-06-16 1983-12-20 パイオニア株式会社 Muting amplifier malfunction prevention circuit
JPS59138105A (en) * 1983-01-27 1984-08-08 Sony Corp Muting circuit

Also Published As

Publication number Publication date
JPH0212049B2 (en) 1990-03-16

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