JPS5482148A - Muting control circuit - Google Patents

Muting control circuit

Info

Publication number
JPS5482148A
JPS5482148A JP14922977A JP14922977A JPS5482148A JP S5482148 A JPS5482148 A JP S5482148A JP 14922977 A JP14922977 A JP 14922977A JP 14922977 A JP14922977 A JP 14922977A JP S5482148 A JPS5482148 A JP S5482148A
Authority
JP
Japan
Prior art keywords
turned
potential
collector
muting control
becomes
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
JP14922977A
Other languages
Japanese (ja)
Inventor
Hiromichi Tanaka
Akihiro Asada
Kaname Oota
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 JP14922977A priority Critical patent/JPS5482148A/en
Publication of JPS5482148A publication Critical patent/JPS5482148A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
    • H03F1/30—Modifications of amplifiers to reduce influence of variations of temperature or supply voltage or other physical parameters
    • H03F1/305—Modifications of amplifiers to reduce influence of variations of temperature or supply voltage or other physical parameters in case of switching on or off of a power supply

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Amplifiers (AREA)
  • Noise Elimination (AREA)

Abstract

PURPOSE:To mute the unpleasant pop noise which is generated when switching on and off the power supply by changing the making/breaking signal of the power supply into the muting control signal through the logical sum circuit. CONSTITUTION:With closure of power switch 27 of the muting control circuit, base potential VB31 of transistor Tr11 rises simultaneously with 30a of power voltage 30 like 31a but VB32 of Tr14 rises with a delay equivalent to the charge time of capacitor C18 like 32a. And Tr11 is turned on with Tr14 turned off respectively by the theory of the differential amplifier, and the double current flows to the collector of Tr11. Thus, the collector potential lowers like 34a, and the collector potential of Tr14 becomes identical to the power voltage like 33a. Accordingly, VB of Tr20 becomes over threshold voltage Vth, and thus Tr24 is turned on with output terminal 25 potential turned to low level 35a. When charging of C18 is over with identical VB obtained between Tr11 and 14, the circuit becomes stable with output 25 potential turned to high level 35.
JP14922977A 1977-12-14 1977-12-14 Muting control circuit Pending JPS5482148A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP14922977A JPS5482148A (en) 1977-12-14 1977-12-14 Muting control circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP14922977A JPS5482148A (en) 1977-12-14 1977-12-14 Muting control circuit

Publications (1)

Publication Number Publication Date
JPS5482148A true JPS5482148A (en) 1979-06-30

Family

ID=15470682

Family Applications (1)

Application Number Title Priority Date Filing Date
JP14922977A Pending JPS5482148A (en) 1977-12-14 1977-12-14 Muting control circuit

Country Status (1)

Country Link
JP (1) JPS5482148A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5894213A (en) * 1981-11-30 1983-06-04 Mitsubishi Electric Corp Suppressing circuit for transient output sound of audio amplifier

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5894213A (en) * 1981-11-30 1983-06-04 Mitsubishi Electric Corp Suppressing circuit for transient output sound of audio amplifier
JPH0117605B2 (en) * 1981-11-30 1989-03-31 Mitsubishi Electric Corp

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