CN210670000U - Audio power amplifying circuit with pure tone quality - Google Patents
Audio power amplifying circuit with pure tone quality Download PDFInfo
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- CN210670000U CN210670000U CN201921813454.5U CN201921813454U CN210670000U CN 210670000 U CN210670000 U CN 210670000U CN 201921813454 U CN201921813454 U CN 201921813454U CN 210670000 U CN210670000 U CN 210670000U
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Abstract
The utility model discloses an audio power amplifying circuit with pure tone quality, which comprises an audio input circuit, a filter circuit, a bias circuit, a volume adjusting circuit, a first coupling circuit, a negative feedback amplifying circuit, a second coupling circuit, a pushing circuit, a push-pull circuit, a loudspeaker and a DC power supply; the audio input circuit is connected with the bias circuit and the volume adjusting circuit and is used for receiving audio signals; the filter circuit is connected with the direct current power supply and the bias circuit and is used for filtering clutter output by the direct current power supply; the volume adjusting circuit is connected with the first coupling circuit and is used for adjusting the audio output signal of the audio input circuit; the negative feedback amplifying circuit is connected with the first coupling circuit and the second coupling circuit, the pushing circuit is connected with the second coupling circuit and the push-pull circuit, and the loudspeaker is connected with the push-pull circuit. The utility model has the advantages of strong anti-interference ability, stable operation and pure tone quality.
Description
Technical Field
The utility model relates to an audio power amplification technical field, in particular to audio power amplifier circuit who is applied to tone quality pureness on notebook computer.
Background
With the continuous development of integrated circuit technology, the integrated circuit technology is applied to portable electronic products more and more widely. In the application fields of notebook computers and the like, the volume and the tone quality can have important influence on the user experience, and the audio power amplifier in the audio power amplifying circuit with pure tone quality which is commonly used at present mainly obtains larger volume and better sound effect by outputting higher power. The AB-class audio power amplifier has good linearity, simple design structure, few peripheral components, no EMI interference problem and relatively good tone quality, and is widely applied to audio power amplifying circuits with pure tone quality. However, the sound quality of the conventional audio power amplifier circuit with pure sound quality is not pure enough, and improvement is urgently needed.
SUMMERY OF THE UTILITY MODEL
The technical problem solved by the utility model is to provide a pure audio power amplifier circuit of tone quality.
The utility model provides an audio power amplifying circuit with pure tone quality, which comprises an audio input circuit, a filter circuit, a bias circuit, a volume adjusting circuit, a first coupling circuit, a negative feedback amplifying circuit, a second coupling circuit, a pushing circuit, a push-pull circuit, a loudspeaker and a DC power supply; the audio input circuit is connected with the bias circuit and the volume adjusting circuit and is used for receiving audio signals; the filter circuit is connected with the direct current power supply and the bias circuit and is used for filtering clutter output by the direct current power supply; the volume adjusting circuit is connected with the first coupling circuit and is used for adjusting the audio output signal of the audio input circuit; the negative feedback amplifying circuit is connected with the first coupling circuit and the second coupling circuit, the pushing circuit is connected with the second coupling circuit and the push-pull circuit, and the loudspeaker is connected with the push-pull circuit.
Preferably, the audio input circuit comprises an audio receiving device, a first end of the audio receiving device is connected with the volume adjusting circuit and the first coupling circuit, and a second end of the audio receiving device is grounded.
Preferably, the filter circuit includes a first resistor and a first capacitor, a first end of the first capacitor is connected to a first end of the first resistor and to the bias circuit, and a second end of the first capacitor is grounded; and the second end of the first resistor is connected with a power supply.
Preferably, the bias circuit includes a second resistor, a first end of the second resistor is connected to the first resistor and the first capacitor, and a second end of the second resistor is connected to the audio receiving device and the volume adjusting circuit.
Preferably, the volume adjusting circuit comprises a second capacitor and a sliding rheostat, a first end of the second capacitor is connected with the second resistor and the audio receiving device, and a second end of the second capacitor is connected with the sliding rheostat; the first end of the slide rheostat is connected with the first coupling circuit, and the second end of the slide rheostat is grounded.
Preferably, the first coupling circuit comprises a third capacitor, a first end of the third capacitor is connected with the negative feedback amplifying circuit, and a second end of the third capacitor is connected with the sliding rheostat.
Preferably, the negative feedback amplifying circuit comprises a fourth resistor, a fifth resistor, a first triode and a fourth capacitor, wherein a first end of the fourth resistor is connected with the third capacitor and the fourth capacitor, and a second end of the fourth resistor is connected with a second end of the fifth resistor, the second coupling circuit and a collector of the first triode; the first end of the fifth resistor is connected with a power supply; the collector of the first triode is connected with the fourth resistor, the fifth resistor and the second coupling circuit; the base electrode of the first triode is connected with the fourth capacitor and the fourth resistor, and the emitting electrode of the first triode is grounded.
Preferably, the second coupling circuit includes a fifth capacitor, a first end of the fifth capacitor is connected to the fourth resistor, the fifth resistor and the collector of the first triode, and a second end of the fifth capacitor is connected to the push circuit.
Preferably, the push circuit comprises a sixth resistor, a seventh resistor, an eighth resistor, a second triode, a sixth capacitor and a seventh capacitor, a first end of the sixth resistor is connected with the power supply, a second end of the sixth resistor is connected with a fifth capacitor, a first end of the seventh resistor and a base of the second triode, and a second end of the seventh resistor is connected with the push-pull circuit; the first end of the eighth resistor is connected with a power supply, the two ends of the eighth resistor are connected with the emitter of the second triode and the sixth capacitor, the base of the second triode is connected with the fifth capacitor, and the collector of the second triode is connected with the push-pull circuit; a first end of the sixth capacitor is connected with a first end of the eighth resistor, and a second end of the sixth capacitor is connected with a second end of the eighth resistor; and the first end of the seventh capacitor is connected with a power supply, and the second end of the seventh capacitor is grounded.
Preferably, the push-pull circuit includes a diode, a ninth resistor, a tenth resistor, a third triode, a fourth triode, and an eighth capacitor, a first end of the diode is connected to a collector of the second triode and a base of the third triode, and a second end of the diode is connected to a first end of the ninth resistor; a second end of the ninth resistor is connected with a first end of the tenth resistor and a base of the fourth triode, and a second end of the tenth resistor is grounded; a collector electrode of the third triode is connected with a power supply, and an emitter electrode of the third triode is connected with an emitter electrode of the fourth triode and a first end of an eighth capacitor; the collector of the fourth triode is grounded; and the second end of the eighth capacitor is connected with a loudspeaker.
The utility model discloses following beneficial effect has: the utility model discloses an audio input circuit, filter circuit, biasing circuit, volume control circuit, first coupling circuit, negative feedback amplifier circuit, second coupling circuit, impulse circuit and push-pull circuit between the cooperation, therefore in better ground filtering, signal output is also called stably, is difficult to appear the condition of fluctuation by a wide margin, and the interference killing feature is strong, therefore tone quality is pure, and user experience is good.
Drawings
Fig. 1 is a circuit diagram of the audio power amplifying circuit with pure tone quality of the present invention.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings and examples. It should be noted that, if there is no conflict, the embodiments and various features in the embodiments of the present invention may be combined with each other, and all are within the scope of the present invention.
Referring to fig. 1, the present invention provides an audio power amplifier circuit with pure tone quality, which includes an audio input circuit 1, a filter circuit 2, a bias circuit 3, a volume adjusting circuit 4, a first coupling circuit 5, a negative feedback amplifier circuit 6, a second coupling circuit 7, a push circuit 8, a push-pull circuit 9, a speaker BP and a dc power supply Vcc. The audio input circuit 1 is connected with the bias circuit 3 and the volume adjusting circuit 4, and is used for receiving audio signals. The filter circuit 2 is connected with the direct current power supply Vcc and the bias circuit 3 and is used for filtering noise waves output by the direct current power supply Vcc. The volume adjusting circuit 4 is connected to the first coupling circuit 5 for adjusting the audio output signal of the audio input circuit 1. The negative feedback amplifying circuit 6 is connected with the first coupling circuit 5 and the second coupling circuit 7, the pushing circuit 8 is connected with the second coupling circuit 7 and the push-pull circuit 9, and the loudspeaker BP is connected with the push-pull circuit 9.
The audio input circuit 1 comprises an audio receiving device T, a first end of the audio receiving device T is connected with the volume adjusting circuit 4 and the first coupling circuit 5, and a second end of the audio receiving device T is grounded. In this embodiment, the audio receiving device T is an electret microphone.
The filter circuit 2 comprises a first resistor R1 and a first capacitor C1, wherein a first end of the first capacitor C1 is connected with a first end of the first resistor R1 and the bias circuit 3, and a second end of the first capacitor C1 is grounded. The second end of the first resistor R1 is connected with a power supply. By arranging the filter circuit 2, a stable voltage can be provided for the bias circuit 3, and a stable working voltage point is provided for the audio input circuit 1 through the bias circuit 3.
The bias circuit 3 comprises a second resistor R2, a first end of the second resistor R2 is connected to the first resistor R1 and the first capacitor C1, and a second end of the second resistor R2 is connected to the audio receiving device T and the volume adjusting circuit 4. The volume adjusting circuit 4 comprises a second capacitor C2 and a sliding rheostat R3, wherein a first end of the second capacitor C2 is connected with the second resistor R2 and the audio receiving device T, and a second end of the second capacitor C2 is connected with the sliding rheostat R3; the first end of the sliding rheostat R3 is connected with the first coupling circuit 5, and the second end of the sliding rheostat R3 is grounded. By arranging the volume adjusting circuit 4, the volume can be adjusted according to the needs to meet the needs of different users. The slide rheostat R3 serves as a third resistor.
The first coupling circuit 5 comprises a third capacitor C3, a first end of the third capacitor C3 is connected with the negative feedback amplifying circuit 6, and a second end of the third capacitor C3 is connected with the sliding rheostat R3. By the first coupling circuit 5, unnecessary noise waves can be filtered out, and guarantee is provided for ensuring pure tone quality. The negative feedback amplifying circuit 6 comprises a fourth resistor R4, a fifth resistor R5, a first triode Q1 and a fourth capacitor C4, wherein a first end of the fourth resistor R4 is connected with the third capacitor C3 and the fourth capacitor C4, and a second end of the fourth resistor R4 is connected with a second end of the fifth resistor R5, the second coupling circuit 7 and a collector of the first triode Q1.
A first terminal of the fifth resistor R5 is connected to a power supply. The collector of the first triode Q1 is connected with the fourth resistor R4, the fifth resistor R5 and the second coupling circuit 7; the base of the first transistor Q1 is connected to the fourth capacitor C4 and the fourth resistor R4, and the emitter of the first transistor Q1 is grounded. By providing the negative feedback amplifier circuit 6, the circuit operates stably and is less susceptible to interference and large fluctuation. By providing the fourth capacitor C4, howling is better prevented.
The second coupling circuit 7 includes a fifth capacitor C5, a first end of the fifth capacitor C5 is connected to the fourth resistor R4, the fifth resistor R5 and the collector of the first transistor Q1, and a second end of the fifth capacitor C5 is connected to the driving circuit 8. By means of the second coupling circuit 7, unnecessary noise can be further filtered out, i.e. the noise signal is blocked from being transmitted to the subsequent stage.
The push circuit 8 comprises a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a second triode Q2, a sixth capacitor C6 and a seventh capacitor C7, a first end of the sixth resistor R6 is connected with a power supply, a second end of the sixth resistor R6 is connected with a fifth capacitor C5, a first end of the seventh resistor R7 and a base of the second triode Q2, and a second end of the seventh resistor R7 is connected with the push-pull circuit 9. The first end of the eighth resistor R8 is connected with a power supply, the two ends of the eighth resistor R8 are connected with the emitter of the second triode Q2 and the sixth capacitor C6, the base of the second triode Q2 is connected with the fifth capacitor C5, and the collector of the second triode Q2 is connected with the push-pull circuit 9. A first terminal of the sixth capacitor C6 is connected to a first terminal of the eighth resistor R8, and a second terminal of the sixth capacitor C6 is connected to a second terminal of the eighth resistor R8. The first end of the seventh capacitor C7 is connected to a power supply, and the second end of the seventh capacitor C7 is grounded. Through the cooperation of the sixth resistor R6 and the seventh resistor R7, a stable working point is provided for the second triode Q2, which plays a role of deep negative feedback, so that the circuit can work more stably.
The push-pull circuit 9 comprises a diode VD, a ninth resistor R9, a tenth resistor R10, a third triode Q3, a fourth triode Q4 and an eighth capacitor C8, wherein the first end of the diode VD is connected with the collector of the second triode Q2 and the base of the third triode Q3, and the second end of the diode VD is connected with the first end of the ninth resistor R9. The second end of the ninth resistor R9 is connected to the first end of the tenth resistor R10 and the base of the fourth transistor Q4, and the second end of the tenth resistor R10 is grounded. The collector of the third transistor Q3 is connected to a power supply, and the emitter of the third transistor Q3 is connected to the emitter of the fourth transistor Q4 and the first end of the eighth capacitor C8. The collector of the fourth transistor Q4 is grounded. The second terminal of the eighth capacitor C8 is connected to the loudspeaker BP. Through setting up diode VD, it has certain temperature compensation effect, has guaranteed that the operating temperature of circuit is decided.
To sum up, the utility model discloses an audio input circuit 1, filter circuit 2, biasing circuit 3, volume control circuit 4, first coupling circuit 5, negative feedback amplifier circuit 6, second coupling circuit 7, push circuit 8 and push-pull circuit 9 between the cooperation, therefore in better ground filtering, signal output is also called stably, is difficult to appear the condition of fluctuation by a wide margin, therefore tone quality is pure, and user experience is good.
The audio power amplifying circuit with pure tone quality provided by the present invention is introduced in detail above, and a specific example is applied in this document to explain the principle and the implementation of the present invention, and the description of the above embodiment is only used to help understanding the method and the core idea of the present invention; meanwhile, for the general technical personnel in the field, according to the idea of the present invention, there are changes in the concrete implementation and the application scope. To sum up, this description content only does the embodiment of the utility model, not therefore the restriction the patent scope of the utility model, all utilize the equivalent structure or the equivalent flow transform that the content of the description and the attached drawing was done, or directly or indirectly use in other relevant technical field, all the same reason is included in the patent protection scope of the utility model, should not be understood as right the utility model discloses a restriction.
Claims (10)
1. An audio power amplifying circuit with pure tone quality is characterized by comprising an audio input circuit, a filter circuit, a bias circuit, a volume adjusting circuit, a first coupling circuit, a negative feedback amplifying circuit, a second coupling circuit, a pushing circuit, a push-pull circuit, a loudspeaker and a direct current power supply; the audio input circuit is connected with the bias circuit and the volume adjusting circuit and is used for receiving audio signals; the filter circuit is connected with the direct current power supply and the bias circuit and is used for filtering clutter output by the direct current power supply; the volume adjusting circuit is connected with the first coupling circuit and is used for adjusting the audio output signal of the audio input circuit; the negative feedback amplifying circuit is connected with the first coupling circuit and the second coupling circuit, the pushing circuit is connected with the second coupling circuit and the push-pull circuit, and the loudspeaker is connected with the push-pull circuit.
2. The clean-timbre audio power amplifier circuit as claimed in claim 1, wherein said audio input circuit includes an audio receiving device, a first end of said audio receiving device being connected to said volume adjusting circuit and said first coupling circuit, a second end of said audio receiving device being connected to ground.
3. The clean-timbre audio power amplifier circuit as claimed in claim 2, wherein said filter circuit includes a first resistor, a first capacitor, a first terminal of said first capacitor being connected to a first terminal of said first resistor and to said bias circuit, a second terminal of said first capacitor being connected to ground; and the second end of the first resistor is connected with a power supply.
4. The clean-timbre audio power amplifier circuit as claimed in claim 3, wherein said biasing circuit includes a second resistor, a first terminal of said second resistor being connected to said first resistor and said first capacitor, and a second terminal of said second resistor being connected to said audio receiver and said volume adjustment circuit.
5. The clean-quality audio power amplifying circuit according to claim 4, wherein the volume adjusting circuit comprises a second capacitor, a sliding rheostat, a first end of the second capacitor is connected with the second resistor and the audio receiving device, and a second end of the second capacitor is connected with the sliding rheostat; the first end of the slide rheostat is connected with the first coupling circuit, and the second end of the slide rheostat is grounded.
6. The clean-quality audio power amplifier circuit as claimed in claim 5, wherein said first coupling circuit comprises a third capacitor, a first end of said third capacitor is connected to said negative feedback amplifier circuit, and a second end of said third capacitor is connected to said sliding rheostat.
7. The clean-timbre audio power amplifier circuit as claimed in claim 6, wherein said negative feedback amplifier circuit comprises a fourth resistor, a fifth resistor, a first transistor, and a fourth capacitor, a first end of said fourth resistor is connected to said third capacitor and said fourth capacitor, a second end of said fourth resistor is connected to a second end of said fifth resistor, said second coupling circuit, and a collector of said first transistor; the first end of the fifth resistor is connected with a power supply; the collector of the first triode is connected with the fourth resistor, the fifth resistor and the second coupling circuit; the base electrode of the first triode is connected with the fourth capacitor and the fourth resistor, and the emitting electrode of the first triode is grounded.
8. The clean-timbre audio power amplifier circuit as claimed in claim 7, wherein said second coupling circuit includes a fifth capacitor, a first terminal of said fifth capacitor is connected to said fourth resistor, said fifth resistor and a collector of said first transistor, and a second terminal of said fifth capacitor is connected to said push circuit.
9. The clean-timbre audio power amplifier circuit as claimed in claim 8, wherein said push circuit comprises a sixth resistor, a seventh resistor, an eighth resistor, a second transistor, a sixth capacitor, and a seventh capacitor, a first end of said sixth resistor is connected to the power supply, a second end of said sixth resistor is connected to the fifth capacitor, a first end of said seventh resistor, and a base of said second transistor, and a second end of said seventh resistor is connected to the push-pull circuit; the first end of the eighth resistor is connected with a power supply, the two ends of the eighth resistor are connected with the emitter of the second triode and the sixth capacitor, the base of the second triode is connected with the fifth capacitor, and the collector of the second triode is connected with the push-pull circuit; a first end of the sixth capacitor is connected with a first end of the eighth resistor, and a second end of the sixth capacitor is connected with a second end of the eighth resistor; and the first end of the seventh capacitor is connected with a power supply, and the second end of the seventh capacitor is grounded.
10. The clean-timbre audio power amplifier circuit as claimed in claim 9, wherein said push-pull circuit includes a diode, a ninth resistor, a tenth resistor, a third transistor, a fourth transistor, and an eighth capacitor, a first terminal of said diode is connected to a collector of said second transistor and a base of said third transistor, and a second terminal of said diode is connected to a first terminal of said ninth resistor; a second end of the ninth resistor is connected with a first end of the tenth resistor and a base of the fourth triode, and a second end of the tenth resistor is grounded; a collector electrode of the third triode is connected with a power supply, and an emitter electrode of the third triode is connected with an emitter electrode of the fourth triode and a first end of an eighth capacitor; the collector of the fourth triode is grounded; and the second end of the eighth capacitor is connected with a loudspeaker.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921813454.5U CN210670000U (en) | 2019-10-25 | 2019-10-25 | Audio power amplifying circuit with pure tone quality |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921813454.5U CN210670000U (en) | 2019-10-25 | 2019-10-25 | Audio power amplifying circuit with pure tone quality |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210670000U true CN210670000U (en) | 2020-06-02 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921813454.5U Active CN210670000U (en) | 2019-10-25 | 2019-10-25 | Audio power amplifying circuit with pure tone quality |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210670000U (en) |
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2019
- 2019-10-25 CN CN201921813454.5U patent/CN210670000U/en active Active
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Address after: 518000 Guangdong city of Shenzhen province Futian District Che Kung Temple Tairan nine road Haisong building B-1303 Patentee after: Shenzhen smart Micro Intelligent Technology Co., Ltd Address before: 518000 Guangdong city of Shenzhen province Futian District Che Kung Temple Tairan nine road Haisong building B-1303 Patentee before: JWIPC TECHNOLOGY DEVELOPMENT Ltd. |