CN201114440Y - TV set with power on silence circuit and this circuit - Google Patents
TV set with power on silence circuit and this circuit Download PDFInfo
- Publication number
- CN201114440Y CN201114440Y CNU2007200263021U CN200720026302U CN201114440Y CN 201114440 Y CN201114440 Y CN 201114440Y CN U2007200263021 U CNU2007200263021 U CN U2007200263021U CN 200720026302 U CN200720026302 U CN 200720026302U CN 201114440 Y CN201114440 Y CN 201114440Y
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- triode
- emitter
- turn
- resistance
- television set
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Abstract
The utility model provides a turnon mute circuit and a TV with the circuit. The utility model realizes that the mute of a loudhailer is maintained at the moment when the TV is turned on and then the mute is removed, thereby not only solving the problem of noises when turning on but also having no effect on the normal application of the TV. The turnon mute circuit of the utility model consists of a triode, a capacitance and a plurality of resistances; the emitter of the triode is connected with a direct current (DC) power, a collector is connected with a mute control terminal of a power amplifier circuit through a first resistor, a base is connected with the anode of the capacitor through a second resistor and the anode of the capacitor is earthed. The turnon mute circuit of the utility model effectively eliminates noises of shock wave at the moment of turnon and improves the quality of TV products.
Description
Technical field
The utility model relates to a kind of mute circuit, relates to a kind of turn-on muting circuit that is used for television set more specifically.
Background technology
Along with the raising day by day of living standard, the user is also more and more higher to the requirement of television set.Yet at present the television set used always of user is when start, loud speaker through regular meeting send similar " bang " noise, this can produce uncomfortable feeling to the user.And send " bang " in the sound, the immediate current of the loud speaker of flowing through can be very big, will certainly cause the very big damage to loud speaker, thereby shortened the useful life of loud speaker, reduced the reliability of television product.
The utility model content
In order to address the above problem, the utility model provides a kind of turn-on muting circuit, realized keeping loud speaker quiet in the moment of television boot-strap, and it is quiet to remove loud speaker subsequently, noise problem when both having solved start does not influence the normal use of television set again.
Turn-on muting circuit of the present utility model is made up of triode, electric capacity and some resistance, concrete annexation is: the emitter of triode connects a DC power supply, base stage connects the positive pole of an electric capacity by first resistance, the minus earth of described electric capacity, collector electrode is by quiet control signal of second resistance output.
The base stage of above-mentioned triode can also connect the emitter of this triode by the 3rd resistance.
The emitter of above-mentioned triode can also connect the negative pole of a diode, and the positive pole of diode links to each other with the positive pole of above-mentioned electric capacity.
One the 4th resistance of can connecting between the emitter of above-mentioned triode and the described DC power supply.
Above-mentioned triode can be the positive-negative-positive triode.
Further, the utility model also provides a kind of television set with above-mentioned turn-on muting circuit, this television set comprises power amplifier and power supply, this power amplifier comprises quiet control terminal, this turn-on muting circuit comprises a triode, and the emitter of described triode connects described power supply, and collector electrode connects the quiet control terminal of described power amplifier by first resistance, base stage is by the positive pole of an electric capacity of second resistance connection, the minus earth of described electric capacity.
The base stage of above-mentioned triode can also connect the emitter of this triode by the 3rd resistance.
The emitter of above-mentioned triode can also connect the negative pole of a diode, and the positive pole of diode links to each other with the positive pole of above-mentioned electric capacity.
One the 4th resistance of can connecting between the emitter of above-mentioned triode and the described DC power supply.
Above-mentioned triode can be the positive-negative-positive triode.
Adopt above-mentioned turn-on muting circuit, effectively eliminated the sonic boom of start moment, promoted the quality of tv product.
Description of drawings
Figure 1 shows that the schematic diagram of a general television set.
Figure 2 shows that the schematic diagram with television set of turn-on muting circuit of the present utility model.
Figure 3 shows that a kind of circuit diagram of turn-on muting circuit of the present utility model.
Embodiment
The utility model is described in more detail below in conjunction with the drawings and specific embodiments.
Television set 100 shown in Figure 1 is in when start, and noise may appear in loud speaker 200, such as similar " bang " sound.Why such noise can appear, reason may be that the mute circuit that there is no need of the power amplifier of television set or mute circuit design are improper, like this, in the moment of start, power amplifier can produce an immediate current or the high voltage of moment, can cause the input of loud speaker 200 uncertain, thereby make loud speaker 200 send the noise that should not have.
Figure 2 shows that the schematic diagram with television set of turn-on muting circuit of the present utility model.As shown in the figure, television set 100 of the present utility model comprises power amplifier 110, turn-on muting circuit 130, loud speaker 200 and power supply 140.Wherein, power amplifier 110 has a quiet control terminal 120, when quiet control terminal 120 is input as high level, power amplifier 110 will be in mute state, at this moment, no matter the input of power amplifier 110 is any signal, and loud speaker 200 can not sounded; And when quiet control terminal 120 was input as low level, power amplifier 110 was in normal operating conditions, and loud speaker 200 sends corresponding sound according to the signal of input.According to these characteristics, turn-on muting circuit 130 is started shooting moment at television set 100, and the quiet control terminal 120 of control power amplifier 110 keeps high level, and voltage reduces thereupon, and the input voltage of quiet control terminal 120 becomes low level.Like this, start shooting moment at television set 100, because quiet control terminal 120 is a high level, power amplifier 110 keeps mute state, the neutral signal that import power amplifier 110 this moment will can not cut any ice to loud speaker 200, so just avoid the generation of start-up noises; And along with the input voltage of quiet control terminal 120 becomes low level, power amplifier 110 beginning operate as normal.
Figure 3 shows that a kind of physical circuit figure of turn-on muting circuit 130.As shown in the figure, Q1 is a triode, and the emitter of triode Q1 is connected to power supply 140 by resistance R 1, and collector electrode is connected to the quiet control terminal 120 of power amplifier by resistance R 4.The base stage of Q1 is connected on the resistance R 1 by resistance R 3, and the base stage of Q1 is connected on the capacitor C 1 by R2 simultaneously.Diode D1 connects together the positive pole of C1 with R3 and R1.
The moment that television set powers on, the voltage output of power supply 140 rises to the required voltage of television set work (as 12V) by 0V, at this moment, passes through R1, Q1 and R2, capacitor C 1 begins charging, and then the Q1 conducting, and the base stage of Q1 is in high level, at this moment, the collector electrode of Q1 makes power amplifier 110 be in mute state by the quiet control terminal 120 of R4 output high level to power amplifier 110, thereby has eliminated the sonic boom when system for TV set is started shooting.Along with finishing of capacitor C 1 charging, Q1 ends, and makes power amplifier 110 be in normal operating conditions, television set 100 beginning operate as normal.So just realized that the turn-on muting circuit makes mute of television set in the moment of starting shooting, and don't influenced the normal effect of using of television set.
In the foregoing circuit, triode Q1 is a NPN type triode, the value of R1, R2, R3, R4 can be respectively 10 ohm, 10K ohm, 1K ohm and 4.7K ohm, capacitor C 1 can be an electrochemical capacitor, value can be 47 microfarads, certainly, the withstand voltage of capacitor C 1 must be greater than the output voltage of power supply 140.These values can be according to circumstances difference and change, as long as can guarantee this circuit operate as normal.
Above circuit and selecting for use of device are a preferred embodiment of the present utility model.The utility model also has other multiple real-time modes, for example, changes triode Q1 into CMOS pipe or the like.
Certainly; above-mentioned explanation is not to be to restriction of the present utility model; the utility model also is not limited in above-mentioned giving an example, and variation, remodeling, interpolation or replacement that those skilled in the art are made in essential scope of the present utility model also should belong to protection range of the present utility model.
Claims (10)
1, a kind of turn-on muting circuit, it is characterized in that: described turn-on muting circuit comprises a triode, the emitter of described triode connects a DC power supply, base stage connects the positive pole of an electric capacity by first resistance, the minus earth of described electric capacity, collector electrode is by quiet control signal of second resistance output.
2, turn-on muting circuit according to claim 1 is characterized in that: the base stage of described triode also connects the emitter of described triode by the 3rd resistance.
3, turn-on muting circuit according to claim 2, it is characterized in that: the emitter of described triode also connects the negative pole of a diode, and the positive pole of described diode links to each other with the positive pole of described electric capacity.
4, turn-on muting circuit according to claim 3 is characterized in that: be in series with one the 4th resistance between the emitter of described triode and the described DC power supply.
5, according to the arbitrary described turn-on muting circuit of claim 1-4, it is characterized in that: described triode is the positive-negative-positive triode.
6, a kind of television set, comprise power amplifier and power supply, this power amplifier comprises quiet control terminal, it is characterized in that: described television set comprises the turn-on muting circuit, this turn-on muting circuit comprises a triode, and the emitter of described triode connects described power supply, and collector electrode connects the quiet control terminal of described power amplifier by first resistance, base stage is by the positive pole of an electric capacity of second resistance connection, the minus earth of described electric capacity.
7, television set according to claim 6 is characterized in that: the base stage of described triode also connects the emitter of described triode by the 3rd resistance.
8, television set according to claim 7 is characterized in that: the emitter of described triode also connects the negative pole of a diode, and the positive pole of described diode links to each other with the positive pole of described electric capacity.
9, television set according to claim 8 is characterized in that: the emitter of described triode and described DC power supply are in series with one the 4th resistance.
10, according to the arbitrary described television set of claim 6-9, it is characterized in that: described triode is the positive-negative-positive triode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200263021U CN201114440Y (en) | 2007-08-01 | 2007-08-01 | TV set with power on silence circuit and this circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200263021U CN201114440Y (en) | 2007-08-01 | 2007-08-01 | TV set with power on silence circuit and this circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201114440Y true CN201114440Y (en) | 2008-09-10 |
Family
ID=39966188
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2007200263021U Expired - Fee Related CN201114440Y (en) | 2007-08-01 | 2007-08-01 | TV set with power on silence circuit and this circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201114440Y (en) |
-
2007
- 2007-08-01 CN CNU2007200263021U patent/CN201114440Y/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20080910 Termination date: 20120801 |