JPS5482148A - Muting control circuit - Google Patents
Muting control circuitInfo
- 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
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.
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)
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 |
-
1977
- 1977-12-14 JP JP14922977A patent/JPS5482148A/en active Pending
Cited By (2)
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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