CN202353518U - Power amplifier circuit capable of outputting prelude sound - Google Patents
Power amplifier circuit capable of outputting prelude sound Download PDFInfo
- Publication number
- CN202353518U CN202353518U CN2011204902355U CN201120490235U CN202353518U CN 202353518 U CN202353518 U CN 202353518U CN 2011204902355 U CN2011204902355 U CN 2011204902355U CN 201120490235 U CN201120490235 U CN 201120490235U CN 202353518 U CN202353518 U CN 202353518U
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- Prior art keywords
- triode
- sound
- prelude
- power amplifier
- control chip
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Abstract
The utility model discloses a power amplifier circuit capable of outputting prelude sound, which comprises an amplifier circuit (1), the amplifier circuit (1) consists of an operation amplifier (U7A) and a control chip (U8) storing a prelude sound, and the control chip (U8) is the anti-phase input end of the operation amplifier (U7A). The power amplifier circuit capable of outputting the prelude sound can attract people's attention.
Description
Technical field
The utility model relates to a kind of power amplifier that can export prelude sound.
Background technology
Power amplifier, the full name power amplifier is commonly called as " sound amplifier ", is equipment the most basic in the sound system, and its task is to amplify the weak electric signal from signal source to drive loud speaker to sound.Present power amplifier generally all can't produce prelude sound, and so-called prelude sound is to be used for the sound of reminding masses to come into the picture.Because present power amplifier does not have the function of output prelude sound, therefore, wants to come into the picture in the very noisy in public environment, can only cry out with mouth, and is very painstaking.
The utility model content
The technical problem that the utility model will solve is to provide a kind of and can produce prelude sound, the power amplifier that can export prelude sound that can remind masses to come into the picture.
The technical solution of the utility model is; A kind of power amplifier that can export prelude sound with following structure is provided; Comprise amplifying circuit; Described amplifying circuit comprises operational amplifier, also comprises the control chip that stores prelude sound, and described control chip is connected with the inverting input of operational amplifier.
After adopting above structure, the power amplifier that can export prelude sound of the utility model compared with prior art has the following advantages:
Because the power amplifier that can export prelude sound of the utility model also comprises the control chip that stores prelude sound; Described control chip is connected with the inverting input of operational amplifier; Therefore; Can come into the picture through playing prelude sound when needing, need not to cry out with mouth very painstakingly, provide convenience to people.
A kind of improvement as the utility model also comprises Dolby circuit, and described Dolby circuit comprises first triode, second triode and the 3rd triode; The collector electrode of described first triode is connected with control chip, the grounded emitter of described first triode, and the base stage of described first triode is connected with electric capacity; The collector electrode of described second triode is connected with constant voltage, the grounded emitter of described second triode, and the base stage of described second triode is connected with described electric capacity; The collector electrode of described the 3rd triode is connected with the output of operational amplifier, the grounded emitter of described the 3rd triode, and the base stage of described the 3rd triode is connected with the collector electrode of described second triode.After adopting this kind structure, when control chip had the output of prelude sound, control chip can be given low-voltage of first triode; Like this, under the effect of the electric capacity that the base stage with first transistor base is connected, described first triode is switched on; And the first triode conducting, the base stage of second triode does not just have trigger voltage, so second triode ends; And second triode ends, and the base stage of the 3rd triode will obtain trigger voltage and conducting, and the output of the 3rd triode conducting operational amplifier just is zero; Thereby make that described operational amplifier can not exported interference signal under the situation that does not have the output of prelude sound, play the effect of noise reduction.
Description of drawings
Fig. 1 is the circuit theory diagrams of the power amplifier that can export prelude sound of the utility model.
Shown in the figure: 1, amplifying circuit, 2, control chip, 3, Dolby circuit.
Embodiment
Below in conjunction with accompanying drawing and specific embodiment the utility model is described further.
See also shown in Figure 1ly, the power amplifier that can export prelude sound of the utility model comprises amplifying circuit 1 and control chip 2.Described amplifying circuit 1 comprises operational amplifier U7A, first resistance R 30, second resistance R 38 and capacitor C 14.Described control chip U8 stores prelude sound.The prelude sound output pin of described control chip U8 is connected with the inverting input of operational amplifier U7A after first resistance R 30, the normal phase input end input normal voltage of described operational amplifier U7A.Be connected with described second resistance R 38 between the output of described inverting input and operational amplifier U7A, the two ends of described second resistance R 38 are parallel with described capacitor C 14.In this specific embodiment, the model of described control chip U8 is M995C_1, and described prelude sound output pin is 10 pin of control chip U8.The model of described operational amplifier U7A is 4580.
The power amplifier that can export prelude sound of the utility model also comprises Dolby circuit 3, and described Dolby circuit 3 comprises the first triode Q4, the second triode Q5 and the 3rd triode Q6.The collector electrode of the described first triode Q4 is connected with control chip, the grounded emitter of the described first triode Q4, and the base stage of the described first triode Q4 is connected with capacitor C 62.The collector electrode of the described second triode Q5 is connected with constant voltage, the grounded emitter of the described second triode Q5, and the base stage of the described second triode Q5 is connected with described capacitor C 62.The collector electrode of described the 3rd triode Q6 is connected with the output of operational amplifier U7A, the grounded emitter of described the 3rd triode Q6, and the base stage of described the 3rd triode Q6 is connected with the collector electrode of the described second triode Q5.
Below only explaining with regard to the embodiment of the power amplifier that can export prelude sound of the utility model, is the restriction to claim but can not be interpreted as.The utility model is not limited to the structure of the foregoing description, and as can in circuit, increasing electronic component or the circuit that is used for the regulating element parameter, perhaps some auxiliary circuits are like filter circuit etc.All various variations of in the protection range of the utility model claim, being done are all in the protection range at the utility model.
Claims (2)
1. the power amplifier that can export prelude sound; Comprise amplifying circuit (1); Described amplifying circuit (1) comprises operational amplifier (U7A); It is characterized in that: also comprise the control chip (U8) that stores prelude sound, described control chip (U8) is connected with the inverting input of operational amplifier (U7A).
2. the power amplifier that can export prelude sound according to claim 1 is characterized in that: also comprise Dolby circuit (3), described Dolby circuit (3) comprises first triode (Q4), second triode (Q5) and the 3rd triode (Q6); The collector electrode of described first triode (Q4) is connected with control chip (U8), the grounded emitter of described first triode (Q4), and the base stage of described first triode (Q4) is connected with electric capacity (C62); The collector electrode of described second triode (Q5) is connected with constant voltage, the grounded emitter of described second triode (Q5), and the base stage of described second triode (Q5) is connected with described electric capacity (C62); The collector electrode of described the 3rd triode (Q6) is connected with the output of operational amplifier (U7A); The grounded emitter of described the 3rd triode (Q6), the base stage of described the 3rd triode (Q6) is connected with the collector electrode of described second triode (Q5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204902355U CN202353518U (en) | 2011-12-01 | 2011-12-01 | Power amplifier circuit capable of outputting prelude sound |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204902355U CN202353518U (en) | 2011-12-01 | 2011-12-01 | Power amplifier circuit capable of outputting prelude sound |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202353518U true CN202353518U (en) | 2012-07-25 |
Family
ID=46542479
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011204902355U Expired - Fee Related CN202353518U (en) | 2011-12-01 | 2011-12-01 | Power amplifier circuit capable of outputting prelude sound |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202353518U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11936085B2 (en) | 2019-07-16 | 2024-03-19 | Telefonaktiebolaget Lm Ericsson (Publ) | Ceramic waveguide filter |
-
2011
- 2011-12-01 CN CN2011204902355U patent/CN202353518U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11936085B2 (en) | 2019-07-16 | 2024-03-19 | Telefonaktiebolaget Lm Ericsson (Publ) | Ceramic waveguide filter |
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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: 20120725 Termination date: 20121201 |