CN203851213U - Television power amplifier mute circuit - Google Patents
Television power amplifier mute circuit Download PDFInfo
- Publication number
- CN203851213U CN203851213U CN201420213883.XU CN201420213883U CN203851213U CN 203851213 U CN203851213 U CN 203851213U CN 201420213883 U CN201420213883 U CN 201420213883U CN 203851213 U CN203851213 U CN 203851213U
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- China
- Prior art keywords
- triode
- power amplifier
- delay switch
- switch circuit
- circuit
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- 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.)
- Expired - Lifetime
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- 239000003990 capacitor Substances 0.000 claims abstract description 14
- 230000030279 gene silencing Effects 0.000 claims description 9
- 238000004146 energy storage Methods 0.000 abstract 2
- 238000000034 method Methods 0.000 description 5
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
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Abstract
The utility model discloses a television power amplifier mute circuit, and relates to a mute circuit. The television power amplifier mute circuit comprises a time-delay switch circuit, wherein the time-delay switch circuit comprises a triode Q1, a triode Q2, an energy storage capacitor C4, a voltage dividing resistor R6 and a current limiting resistor R8, wherein the voltage dividing resistor R6 and the energy storage capacitor C4 are connected in series and then connected between the ground and a power supply of a power amplifier, the end, which is connected with the power supply of the power amplifier, of the voltage dividing resistor R6 is grounded through the current limiting resistor R8, an emitting electrode of the triode Q1 and a base electrode of the triode Q2 are connected to one end of the voltage dividing resistor R6, a base electrode of the triode Q1 and an emitting electrode of the triode Q2 are connected to the other end of the voltage dividing resistor R6, a collector electrode of the triode Q1 is connected with a collector electrode of the triode Q2, a connection point of the collector electrode of the triode Q1 and the collector electrode of the triode Q2 is an output end of the time-delay switch circuit, and the output end of the time-delay switch circuit is connected to a mute end of the power amplifier through a phase inverting circuit.
Description
Technical field
The utility model relates to a kind of mute circuit, is specifically related to a kind of mute circuit of TV power amplifier.
Background technology
Television set is in the time of start or shutdown, and the power amplifier of television set is because input signal can suddenly change, and the signal of its output also can produce sudden change, thereby makes loud speaker send the abnormal sound, forms noise.
Summary of the invention
For the problems referred to above, the utility model provides a kind of TV power amplifier muting circuit, and this mute circuit can make described power amplifier quiet in switching on and shutting down process.
For achieving the above object, the utility model provides following technical scheme.
A kind of TV power amplifier muting circuit, comprise delay switch circuit, delay switch circuit comprises triode Q1, triode Q2, storage capacitor C4, divider resistance R6 and current-limiting resistance R8, triode Q1 and triode Q2 are positive-negative-positive triode, divider resistance R6 after connecting with storage capacitor C4, be connected to and the power supply of described power amplifier between, one end that divider resistance R6 is connected with the power supply of described power amplifier is via current-limiting resistance R8 ground connection, the base stage of the emitter of triode Q1 and triode Q2 is connected in one end of divider resistance R6, the emitter of the base stage of triode Q1 and triode Q2 is connected in the other end of divider resistance R6, the collector electrode of triode Q1 is connected with the collector electrode of triode Q2, the contact of the collector electrode of the collector electrode of triode Q1 and triode Q2 is the output of described delay switch circuit, the output of described delay switch circuit connects the quiet end of described power amplifier via a negative circuit.
Wherein, also comprise the remote-controlled silencing module for the remote-controlled silencing signal receiving being converted to high level or low level output, the output of remote-controlled silencing module connects the output of described delay switch circuit.
Wherein, described negative circuit comprises NPN type triode Q3, and triode Q3 base stage is connected with the output of described delay switch circuit, grounded emitter, and the power supply of collector electrode one tunnel and described power amplifier, another road is connected with the quiet end of described power amplifier.
The beneficial effects of the utility model are: TV power amplifier muting circuit of the present utility model, by delay switch circuit and negative circuit are set, make the quiet end of TV power amplifier in switching on and shutting down process, all keep low level, thereby allow TV power amplifier in switching on and shutting down process, all keep quiet.The circuit structure of TV power amplifier muting circuit of the present utility model is simple, reliable and stable, has realized the quiet effect of TV power amplifier in switching on and shutting down process with lower cost.
Brief description of the drawings
Fig. 1 is the circuit theory diagrams of a kind of TV power amplifier muting circuit of the present utility model.
Reference numeral comprises: delay switch circuit 1, negative circuit 2.
Embodiment
Below in conjunction with specific embodiment, the utility model is elaborated.
As shown in Figure 1, TV power amplifier muting circuit of the present utility model, comprise delay switch circuit 1, delay switch circuit 1 comprises triode Q1, triode Q2, storage capacitor C4, divider resistance R6 and current-limiting resistance R8, triode Q1 and triode Q2 are positive-negative-positive triode, divider resistance R6 after connecting with storage capacitor C4, be connected to and the power supply AMP_POWER of described power amplifier between, one end that divider resistance R6 is connected with the power supply AMP_POWER of described power amplifier is via current-limiting resistance R8 ground connection, the base stage of the emitter of triode Q1 and triode Q2 is connected in one end of divider resistance R6, the emitter of the base stage of triode Q1 and triode Q2 is connected in the other end of divider resistance R6, the collector electrode of triode Q1 is connected with the collector electrode of triode Q2, the contact of the collector electrode of the collector electrode of triode Q1 and triode Q2 is the output of described delay switch circuit 1, the output of described delay switch circuit 1 connects the quiet end of described power amplifier via negative circuit 2.
Particularly, negative circuit 2 comprises NPN type triode Q3, and triode Q3 base stage is connected with the output of described delay switch circuit 1, grounded emitter, and collector electrode is connected with power supply AMP_POWER and the quiet end of described power amplifier simultaneously.By negative circuit 2 is set, thereby strengthen the driving force of TV power amplifier muting circuit of the present utility model.
When start, the power supply AMP_POWER of described power amplifier charges to storage capacitor C4 via divider resistance R6, owing to there being electric current to flow through divider resistance R6, divider resistance R6 two ends form level difference, one end level that itself and storage capacitor C4 join is lower, the emitter level of triode Q2 is lower than its base stage level, therefore triode Q2 cut-off, and triode Q1 emitter level is higher than its base stage level, therefore triode Q1 conducting, the output of described delay switch circuit 1 is to the quiet end output high level of power amplifier, after negative circuit 2, what the quiet termination of power amplifier was received is low level, power amplifier is quiet.When storage capacitor C4 is full of after electricity, just do not have electric current to flow through divider resistance R6, divider resistance R6 two ends level is identical, triode Q1 and triode Q2 all end, the output of described delay switch circuit 1 is to the quiet end output low level of power amplifier, after negative circuit 2, what the quiet termination of power amplifier was received is high level, and power amplifier is normally worked.When shutdown, the rapid power down of power supply AMP_POWER of power amplifier, because the voltage of storage capacitor C4 can not suddenly change, storage capacitor C4 forms discharge loop electric discharge by divider resistance R6 and current-limiting resistance R8, divider resistance R6 two ends form level difference, one end level that itself and storage capacitor C4 join is higher, thereby triode Q1 cut-off, triode Q2 conducting, the output of described delay switch circuit 1 is to the quiet end output high level of power amplifier, after negative circuit 2, what the quiet termination of power amplifier was received is low level, and power amplifier is quiet.
TV power amplifier muting circuit of the present utility model also comprises the remote-controlled silencing module for the remote-controlled silencing signal receiving being converted to high level output, and the output of remote-controlled silencing module connects the output of described delay switch circuit 1.User just can be quiet by remote control control power amplifier in the process of watching TV programme by television set like this.
Finally should be noted that; above embodiment is only in order to illustrate the technical solution of the utility model; but not restriction to the utility model protection range; although the utility model has been done to explain with reference to preferred embodiment; those of ordinary skill in the art is to be understood that; can modify or be equal to replacement the technical solution of the utility model, and not depart from essence and the scope of technical solutions of the utility model.
Claims (3)
1. a TV power amplifier muting circuit, it is characterized in that: comprise delay switch circuit, delay switch circuit comprises triode Q1, triode Q2, storage capacitor C4, divider resistance R6 and current-limiting resistance R8, triode Q1 and triode Q2 are positive-negative-positive triode, divider resistance R6 after connecting with storage capacitor C4, be connected to and the power supply of described power amplifier between, one end that divider resistance R6 is connected with the power supply of described power amplifier is via current-limiting resistance R8 ground connection, the base stage of the emitter of triode Q1 and triode Q2 is connected in one end of divider resistance R6, the emitter of the base stage of triode Q1 and triode Q2 is connected in the other end of divider resistance R6, the collector electrode of triode Q1 is connected with the collector electrode of triode Q2, the contact of the collector electrode of the collector electrode of triode Q1 and triode Q2 is the output of described delay switch circuit, the output of described delay switch circuit connects the quiet end of described power amplifier via a negative circuit.
2. a kind of TV power amplifier muting circuit according to claim 1, it is characterized in that: also comprise the remote-controlled silencing module for the remote-controlled silencing signal receiving being converted to high level or low level output, the output of remote-controlled silencing module connects the output of described delay switch circuit.
3. a kind of TV power amplifier muting circuit according to claim 1, it is characterized in that: described negative circuit comprises NPN type triode Q3, triode Q3 base stage is connected with the output of described delay switch circuit, grounded emitter, the power supply of collector electrode one tunnel and described power amplifier, another road is connected with the quiet end of described power amplifier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420213883.XU CN203851213U (en) | 2014-04-29 | 2014-04-29 | Television power amplifier mute circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420213883.XU CN203851213U (en) | 2014-04-29 | 2014-04-29 | Television power amplifier mute circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203851213U true CN203851213U (en) | 2014-09-24 |
Family
ID=51564177
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420213883.XU Expired - Lifetime CN203851213U (en) | 2014-04-29 | 2014-04-29 | Television power amplifier mute circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203851213U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107426648A (en) * | 2016-05-24 | 2017-12-01 | 华为技术有限公司 | A kind of mute circuit and electronic equipment |
| CN107580278A (en) * | 2017-10-17 | 2018-01-12 | 怀集县正华电器有限公司 | A kind of Stereo Switch machine protecting against shock sound and output short circuit protection circuit |
| CN110602604A (en) * | 2019-09-24 | 2019-12-20 | 先歌国际影音有限公司 | Circuit for eliminating impact sound of power amplifier switch of TPA3116 series |
-
2014
- 2014-04-29 CN CN201420213883.XU patent/CN203851213U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107426648A (en) * | 2016-05-24 | 2017-12-01 | 华为技术有限公司 | A kind of mute circuit and electronic equipment |
| CN107580278A (en) * | 2017-10-17 | 2018-01-12 | 怀集县正华电器有限公司 | A kind of Stereo Switch machine protecting against shock sound and output short circuit protection circuit |
| CN110602604A (en) * | 2019-09-24 | 2019-12-20 | 先歌国际影音有限公司 | Circuit for eliminating impact sound of power amplifier switch of TPA3116 series |
| CN110602604B (en) * | 2019-09-24 | 2024-04-16 | 先歌国际影音股份有限公司 | Circuit for eliminating power on/off impact sound of TPA3116 series power amplifier |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20140924 |