CN211128158U - Active audio signal processing circuit - Google Patents
Active audio signal processing circuit Download PDFInfo
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- CN211128158U CN211128158U CN201922424613.9U CN201922424613U CN211128158U CN 211128158 U CN211128158 U CN 211128158U CN 201922424613 U CN201922424613 U CN 201922424613U CN 211128158 U CN211128158 U CN 211128158U
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Abstract
The utility model discloses an active audio signal processing circuit, which comprises an adjusting circuit, a first coupling circuit, a voltage amplifying circuit, a second coupling circuit, a power amplifying circuit, a filter circuit, a drive circuit, a loudspeaker and a power supply, wherein the adjusting circuit is electrically connected with the first coupling circuit and is used for adjusting the input audio signal; the first coupling circuit is electrically connected with the voltage amplifying circuit, the voltage amplifying circuit is electrically connected with the second coupling circuit, the second coupling circuit is electrically connected with the power amplifying circuit, the power amplifying circuit is electrically connected with the driving circuit, the driving circuit is electrically connected with the loudspeaker, the filter circuit is electrically connected with the power supply, and the power supply is electrically connected with the voltage amplifying circuit, the second coupling circuit and the power amplifying circuit. The utility model has the advantages of simple structure, low cost and good output tone quality.
Description
Technical Field
The utility model relates to a computer technology field, in particular to be applied to active audio signal processing circuit on notebook computer.
Background
The traditional active audio power amplifying circuit is only a simple audio signal power amplifying circuit, when the adjustment is needed, a DSP chip control mode is mainly utilized, although the realization functions are more, the circuit structure is complex, and the device cost is higher. With the rapid development of computers, notebook computers are developing towards miniaturization, and how to develop an active audio signal processing circuit with a simple circuit structure becomes a technical problem to be solved by those skilled in the art.
SUMMERY OF THE UTILITY MODEL
The utility model provides a technical problem be, provide a circuit structure's active audio signal processing circuit.
The utility model provides an active audio signal processing circuit, which comprises an adjusting circuit, a first coupling circuit, a voltage amplifying circuit, a second coupling circuit, a power amplifying circuit, a filter circuit, a drive circuit, a loudspeaker and a power supply, wherein the adjusting circuit is electrically connected with the first coupling circuit and is used for adjusting the input audio signal; the first coupling circuit is electrically connected with the voltage amplifying circuit, the voltage amplifying circuit is electrically connected with the second coupling circuit, the second coupling circuit is electrically connected with the power amplifying circuit, the power amplifying circuit is electrically connected with the driving circuit, the driving circuit is electrically connected with the loudspeaker, the filter circuit is electrically connected with the power supply, and the power supply is electrically connected with the voltage amplifying circuit, the second coupling circuit and the power amplifying circuit.
Preferably, the adjusting circuit comprises a potentiometer, and a first end of the potentiometer is connected with an audio signal input end to receive an audio signal; and the second end of the potentiometer is grounded.
Preferably, the first coupling circuit includes a first capacitor, a first end of the first capacitor is electrically connected to the potentiometer, and a second end of the first capacitor is electrically connected to the voltage amplifying circuit.
Preferably, the voltage amplifying circuit includes a first resistor, a second resistor, a third resistor, a first triode, a second capacitor, and a third capacitor, a first end of the first resistor is electrically connected to the power supply, a second end of the first resistor is electrically connected to a second end of the first capacitor and a first end of the second resistor, and a second end of the second resistor is grounded; the first end of the second capacitor is electrically connected with a power supply, and the second end of the second capacitor is electrically connected with the collector of the first triode and the second coupling circuit; the base electrode of the first triode is electrically connected with the second end of the first resistor, and the emitter electrode of the first triode is electrically connected with the first end of the third resistor and the first end of the third capacitor; the second end of the third resistor is grounded; and the second end of the third capacitor is grounded.
Preferably, the second coupling circuit comprises a thermosensitive device, a fourth resistor, a fifth resistor and a first transformer, wherein a first end of the thermosensitive device is electrically connected with a power supply, and a second end of the thermosensitive device is electrically connected with a second end of the fourth resistor and a first end of a secondary coil of the first transformer; the first end of the fourth resistor is electrically connected with a power supply; the first end of the fifth resistor is electrically connected with the first end of the secondary coil of the first transformer, and the second end of the fifth resistor is grounded; the first end of the first transformer primary coil is electrically connected with the first end of the second capacitor, the second end of the first transformer primary coil is electrically connected with the second end of the second capacitor, and the second end and the third end of the first transformer secondary coil are respectively electrically connected with the power amplification circuit.
Preferably, the power amplifying circuit includes a second triode and a third triode, a base of the second triode is electrically connected with the second end of the secondary coil of the first transformer, a collector of the second triode is electrically connected with the driving circuit, and an emitter of the second triode is electrically connected with an emitter of the third triode and a power supply; and the base electrode of the third triode is electrically connected with the third end of the secondary coil of the first transformer, and the collector electrode of the third triode is electrically connected with the driving circuit.
Preferably, the filter circuit comprises a fourth capacitor, a first end of the fourth capacitor is electrically connected with the power supply, and a second end of the fourth capacitor is grounded.
Preferably, the driving circuit includes a fifth capacitor and a second transformer, a first end of the fifth capacitor is electrically connected to a collector of the second triode and a first end of the primary coil of the second transformer, a second end of the fifth capacitor is electrically connected to a collector of the third triode and a second end of the primary coil of the second transformer, a third end of the primary coil of the second transformer is grounded, and the secondary coil of the second transformer is electrically connected to the speaker.
The utility model discloses following beneficial effect has: the utility model discloses a cooperation between regulating circuit, first coupling circuit, voltage amplification circuit, second coupling circuit, power amplification circuit, filter circuit, drive circuit, speaker and the power, alright broadcast out after enlargiing weak audio signal, it is not only simple in structure, and is with low costs, and it is right through multistage coupling circuit moreover audio signal filtering clutter, therefore tone quality is better.
Drawings
Fig. 1 is a circuit diagram of the active audio signal processing circuit 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 active audio signal processing circuit, which includes a regulating circuit 1, a first coupling circuit 2, a voltage amplifying circuit 3, a second coupling circuit 4, a power amplifying circuit 5, a filter circuit 6, a driving circuit 7, a speaker BP and a power supply Vcc, wherein the regulating circuit 1 is electrically connected to the first coupling circuit 2 for regulating an input audio signal. The first coupling circuit 2 is electrically connected with the voltage amplifying circuit 3, the voltage amplifying circuit 3 is electrically connected with the second coupling circuit 4, the second coupling circuit 4 is electrically connected with the power amplifying circuit 5, the power amplifying circuit 5 is electrically connected with the driving circuit 7, the driving circuit 7 is electrically connected with the loudspeaker BP, the filter circuit 6 is electrically connected with the power supply Vcc, and the power supply Vcc is electrically connected with the voltage amplifying circuit 3, the second coupling circuit 4 and the power amplifying circuit 5. In this embodiment, the power supply Vcc is grounded through the key switch K. Through pressing key switch K, make the utility model discloses work.
The adjusting circuit 1 comprises a potentiometer RP, and a first end of the potentiometer RP is connected with an audio signal input end to receive an audio signal. The second terminal of the potentiometer RP is grounded. By adjusting the potentiometer RP, the volume of the output signal can be adjusted, and thus the adjustment can be performed according to the needs of the user or the needs of the use scenario. The first coupling circuit 2 includes a first capacitor C1, a first end of the first capacitor C1 is electrically connected to the potentiometer RP, and a second end of the first capacitor C1 is electrically connected to the voltage amplifying circuit 3. Through setting up first coupling circuit 2, consequently, better with the clutter filtering that regulating circuit 1 output comes, avoid the transmission to the lower level.
The voltage amplifying circuit 3 includes a first resistor R1, a second resistor R2, a third resistor R3, a first triode Q1, a second capacitor C2, and a third capacitor C3, a first end of the first resistor R1 is electrically connected to a power supply Vcc, a second end of the first resistor R1 is electrically connected to a second end of the first capacitor C1 and a first end of the second resistor R2, and a second end of the second resistor R2 is grounded. A first terminal of the second capacitor C2 is electrically connected to a power source Vcc, and a second terminal of the second capacitor C2 is electrically connected to a collector of the first transistor Q1 and the second coupling circuit 4. The base of the first transistor Q1 is electrically connected to the second terminal of the first resistor R1, and the emitter of the first transistor Q1 is electrically connected to the first terminal of the third resistor R3 and the first terminal of the third capacitor C3. The first triode Q1 is used for amplifying the audio signal.
The second end of the third resistor R3 is grounded. The second terminal of the third capacitor C3 is grounded. It can be understood that the third capacitor C3 is a bypass capacitor for the emitter of the first transistor Q1, and provides a path for the ac signal, so as to ensure that the amplification of the first transistor Q1 is not reduced by the presence of the third resistor R3.
The second coupling circuit 4 includes a thermosensitive device RF, a fourth resistor R4, a fifth resistor R5, and a first transformer L1, a first end of the thermosensitive device RF is electrically connected to a power source Vcc, a second end of the thermosensitive device RF is electrically connected to a second end of the fourth resistor R4 and a first end of a secondary coil of the first transformer L1, a first end of the fourth resistor R4 is electrically connected to the power source Vcc, a first end of the fifth resistor R5 is electrically connected to a first end of the secondary coil of the first transformer L1, a second end of the fifth resistor R5 is grounded, a first end of the primary coil of the first transformer L1 is electrically connected to a first end of the second capacitor C2, a second end of the primary coil of the first transformer L1 is electrically connected to a second end of the second capacitor C2, and a second end and a third end of the secondary coil of the first transformer L1 are respectively electrically connected to the power amplification circuit 5.
The power amplification circuit 5 comprises a second triode Q2 and a third triode Q3, wherein the base of the second triode Q2 is electrically connected with the second end of the secondary coil of the first transformer L1, the collector of the second triode Q2 is electrically connected with the driving circuit 7, the emitter of the second triode Q2 is electrically connected with the emitter of the third triode Q3 and the power supply Vcc, the base of the third triode Q3 is electrically connected with the third end of the secondary coil of the first transformer L1, the collector of the third triode Q3 is electrically connected with the driving circuit 7, the second triode Q2 and the third triode Q3 form a boost power amplifier, and the fourth resistor R4 and the fifth resistor R5 are power amplifier stage bias resistors and provide quiescent currents for the second triode Q2 and the third triode Q3, so as to reduce crossover distortion.
The filter circuit 6 comprises a fourth capacitor C4, a first end of the fourth capacitor C4 is electrically connected to a power Vcc, a second end of the fourth capacitor C4 is grounded, the driving circuit 7 comprises a fifth capacitor C5 and a second transformer L, a first end of the fifth capacitor C5 is electrically connected to a collector of the second triode Q2 and a first end of a primary coil of the second transformer L2, a second end of the fifth capacitor C5 is electrically connected to a collector of the third triode Q3 and a second end of the primary coil of the second transformer L, a third end of the primary coil of the second transformer 7 2 is grounded, and a secondary coil of the second transformer L is electrically connected to the speaker BP, wherein the fifth capacitor C5 is a high-frequency bypass capacitor, so that bypass noise outside an audio frequency range is effectively prevented, the self-excitation of the circuit is effectively prevented, the stability of the circuit is improved, and the sound quality is improved.
To sum up, the utility model discloses a cooperation between regulating circuit 1, first coupling circuit 2, voltage amplifier circuit 3, second coupling circuit 4, power amplifier circuit 5, filter circuit 6, drive circuit 7, speaker BP and the power Vcc alright broadcast out after enlargiing weak audio signal, it is not only simple in structure, and is with low costs, and it is right through multistage coupling circuit moreover audio signal filtering clutter, therefore tone quality is better.
The active audio signal processing circuit provided by the present invention is described in detail above, and the principle and the implementation of the present invention are explained by applying specific examples herein, and the description of the above embodiments 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 (8)
1. An active audio signal processing circuit is characterized by comprising a regulating circuit, a first coupling circuit, a voltage amplifying circuit, a second coupling circuit, a power amplifying circuit, a filter circuit, a driving circuit, a loudspeaker and a power supply, wherein the regulating circuit is electrically connected with the first coupling circuit and is used for regulating an input audio signal; the first coupling circuit is electrically connected with the voltage amplifying circuit, the voltage amplifying circuit is electrically connected with the second coupling circuit, the second coupling circuit is electrically connected with the power amplifying circuit, the power amplifying circuit is electrically connected with the driving circuit, the driving circuit is electrically connected with the loudspeaker, the filter circuit is electrically connected with the power supply, and the power supply is electrically connected with the voltage amplifying circuit, the second coupling circuit and the power amplifying circuit.
2. The active audio signal processing circuit of claim 1, wherein the adjustment circuit comprises a potentiometer having a first end connected to an audio signal input to receive an audio signal; and the second end of the potentiometer is grounded.
3. The active audio signal processing circuit of claim 2, wherein the first coupling circuit comprises a first capacitor, a first end of the first capacitor being electrically connected to the potentiometer, and a second end of the first capacitor being electrically connected to the voltage amplification circuit.
4. The active audio signal processing circuit according to claim 3, wherein the voltage amplifying circuit 3 comprises a first resistor, a second resistor, a third resistor, a first transistor, a second capacitor, and a third capacitor, a first end of the first resistor is electrically connected to a power source, a second end of the first resistor is electrically connected to a second end of the first capacitor and a first end of the second resistor, and a second end of the second resistor is grounded; the first end of the second capacitor is electrically connected with a power supply, and the second end of the second capacitor is electrically connected with the collector of the first triode and the second coupling circuit; the base electrode of the first triode is electrically connected with the second end of the first resistor, and the emitter electrode of the first triode is electrically connected with the first end of the third resistor and the first end of the third capacitor; the second end of the third resistor is grounded; and the second end of the third capacitor is grounded.
5. The active audio signal processing circuit according to claim 4, wherein the second coupling circuit 4 comprises a thermosensitive device, a fourth resistor, a fifth resistor, and a first transformer, a first end of the thermosensitive device is electrically connected to the power supply, and a second end of the thermosensitive device is electrically connected to a second end of the fourth resistor and a first end of the secondary winding of the first transformer; the first end of the fourth resistor is electrically connected with a power supply; the first end of the fifth resistor is electrically connected with the first end of the secondary coil of the first transformer, and the second end of the fifth resistor is grounded; the first end of the first transformer primary coil is electrically connected with the first end of the second capacitor, the second end of the first transformer primary coil is electrically connected with the second end of the second capacitor, and the second end and the third end of the first transformer secondary coil are respectively electrically connected with the power amplification circuit.
6. The active audio signal processing circuit of claim 5, wherein the power amplifying circuit comprises a second transistor and a third transistor, wherein a base of the second transistor is electrically connected to the second terminal of the first transformer secondary, a collector of the second transistor is electrically connected to the driving circuit, and an emitter of the second transistor is electrically connected to an emitter of the third transistor and a power source; and the base electrode of the third triode is electrically connected with the third end of the secondary coil of the first transformer, and the collector electrode of the third triode is electrically connected with the driving circuit.
7. The active audio signal processing circuit of claim 6, wherein the filter circuit comprises a fourth capacitor, a first terminal of the fourth capacitor being electrically connected to a power supply, a second terminal of the fourth capacitor being connected to ground.
8. The active audio signal processing circuit of claim 7, wherein the driving circuit comprises a fifth capacitor and a second transformer, a first terminal of the fifth capacitor is electrically connected to a collector of the second transistor and a first terminal of a primary coil of the second transformer, a second terminal of the fifth capacitor is electrically connected to a collector of the third transistor and a second terminal of the primary coil of the second transformer, a third terminal of the primary coil of the second transformer is grounded, and a secondary coil of the second transformer is electrically connected to the speaker.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922424613.9U CN211128158U (en) | 2019-12-30 | 2019-12-30 | Active audio signal processing circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922424613.9U CN211128158U (en) | 2019-12-30 | 2019-12-30 | Active audio signal processing circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211128158U true CN211128158U (en) | 2020-07-28 |
Family
ID=71710281
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201922424613.9U Active CN211128158U (en) | 2019-12-30 | 2019-12-30 | Active audio signal processing circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211128158U (en) |
-
2019
- 2019-12-30 CN CN201922424613.9U patent/CN211128158U/en active Active
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