CN220043648U - Audio signal amplifying circuit - Google Patents
Audio signal amplifying circuit Download PDFInfo
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- CN220043648U CN220043648U CN202321358213.2U CN202321358213U CN220043648U CN 220043648 U CN220043648 U CN 220043648U CN 202321358213 U CN202321358213 U CN 202321358213U CN 220043648 U CN220043648 U CN 220043648U
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- 230000005236 sound signal Effects 0.000 title claims abstract description 34
- 230000000087 stabilizing effect Effects 0.000 claims abstract description 23
- 238000001914 filtration Methods 0.000 claims abstract description 17
- 230000003321 amplification Effects 0.000 claims abstract description 10
- 238000003199 nucleic acid amplification method Methods 0.000 claims abstract description 10
- 239000003990 capacitor Substances 0.000 claims description 75
- 239000003381 stabilizer Substances 0.000 claims description 14
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 230000002093 peripheral effect Effects 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 1
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Abstract
The utility model discloses an audio signal amplifying circuit, which relates to the field of audio, and comprises: the mains supply module is used for outputting 220V alternating current and supplying the 220V alternating current to the step-down rectifying and filtering module; the voltage-reducing rectification filter module is used for converting 220V alternating current into direct current and outputting the direct current to the voltage-stabilizing module; the voltage stabilizing module is used for outputting stable direct current and supplying the stable direct current to the audio receiving module and the audio amplifying module; the audio receiving module is used for receiving the audio signal and outputting the audio signal to the audio amplifying module; the audio amplifying module is used for completing audio amplification and audio improvement; the utility model has the beneficial effects that the utility model is connected with the step-down rectifying and filtering module, and the step-down rectifying and filtering module is connected with the voltage stabilizing module, compared with the prior art, the utility model has the following advantages: the utility model combines the audio improvement together while completing the audio amplification, and completes two functions through the TDA2822 and the peripheral circuit thereof, and has simple structure and fewer used devices.
Description
Technical Field
The utility model relates to the field of audio, in particular to an audio signal amplifying circuit.
Background
Using headphones, sound equipment, etc., the audio signal must be amplified to drive the horn or headphones to sound. The unamplified signal is either very audible or not audible at all. Therefore, an audio signal amplifying circuit needs to be provided between the output end of the audio signal and the playback apparatus.
The existing audio signal amplifying circuit is often not compatible with the tone quality improving circuit, and related circuits are required to be additionally arranged, so that the existing audio signal amplifying circuit is complicated and needs to be improved.
Disclosure of Invention
The present utility model is directed to an audio signal amplifying circuit, which solves the above-mentioned problems.
In order to achieve the above purpose, the present utility model provides the following technical solutions:
an audio signal amplifying circuit comprising:
the mains supply module is used for outputting 220V alternating current and supplying the 220V alternating current to the step-down rectifying and filtering module;
the voltage-reducing rectification filter module is used for converting 220V alternating current into direct current and outputting the direct current to the voltage-stabilizing module;
the voltage stabilizing module is used for outputting stable direct current and supplying the stable direct current to the audio receiving module and the audio amplifying module;
the audio receiving module is used for receiving the audio signal and outputting the audio signal to the audio amplifying module;
the audio amplifying module is used for completing audio amplification and audio improvement;
the commercial power supply module is connected with the step-down rectifying and filtering module, the step-down rectifying and filtering module is connected with the voltage stabilizing module, the voltage stabilizing module is connected with the audio receiving module and the audio amplifying module, and the audio receiving module is connected with the audio amplifying module.
As still further aspects of the utility model: the step-down rectifying and filtering module comprises a transformer W, a rectifier T, a capacitor C1, a capacitor C2 and an inductor L1, wherein the input end of the transformer W is connected with a mains supply module, one end of the output end of the transformer W is connected with the first end of the rectifier T, the other end of the output end of the transformer W is connected with the third end of the rectifier T, the second end of the rectifier T is grounded, the fourth end of the rectifier T is connected with one end of the capacitor C1 and one end of the inductor L1, the other end of the capacitor C1 is grounded, the other end of the inductor L1 is connected with one end of the capacitor C2 and a voltage stabilizing module, and the other end of the capacitor C2 is grounded.
As still further aspects of the utility model: the voltage stabilizing module comprises a resistor R1, a diode D1, a voltage stabilizer U1, a resistor R2, a first potentiometer RP1 and a capacitor C3, wherein one end of the resistor R1 is connected with the voltage-reducing rectification filter module, the other end of the resistor R1 is connected with the anode of the diode D1 and the input end of the voltage stabilizer U1, the cathode of the diode D1 is grounded, the grounding end of the voltage stabilizer U1 is connected with one end of the resistor R2 and one end of the first potentiometer RP1, the other end of the first potentiometer RP1 is grounded, the output end of the voltage stabilizer U1 is connected with the other end of the resistor R2, one end of the capacitor C3, the audio receiving module and the audio amplifying module, and the other end of the capacitor C3 is grounded.
As still further aspects of the utility model: the audio receiving module comprises a capacitor C4, a resistor R3, a capacitor C5, a resistor R4, a microphone MIC and a capacitor C6, wherein one end of the capacitor C4 is connected with one end of the resistor R3 and the voltage stabilizing module, the other end of the capacitor C4 is grounded, the other end of the resistor R3 is connected with one end of the capacitor C5 and one end of the resistor R4, the other end of the capacitor C5 is grounded, the other end of the resistor R4 is connected with one end of the microphone MIC and one end of the capacitor C6, the other end of the microphone MIC is grounded, and the other end of the capacitor C6 is connected with the audio amplifying module.
As still further aspects of the utility model: the audio amplification module comprises a second potentiometer RP2, a capacitor C7, a capacitor C8, an integrated circuit U2 and a loudspeaker SPEAKER, wherein the model of the integrated circuit U2 is TDA2822, one end of the second potentiometer RP2 is connected with one end of the capacitor C8, the other end of the capacitor C8 is connected with a number 6 pin of the integrated circuit U2, the other end of the second potentiometer RP2 is connected with one end of the capacitor C7, the other end of the capacitor C7 is connected with a number 8 pin of the integrated circuit U2, the sliding end of the second potentiometer RP2 is connected with a number 7 pin of the integrated circuit U2, a number 4 pin of the integrated circuit U2 is grounded, a number 2 pin of the integrated circuit U2 is connected with a voltage stabilizing module, a number 1 pin of the integrated circuit U2 is connected with one end of the loudspeaker SPEAKER, and the other end of the loudspeaker SPEAKER is connected with a number 3 pin of the integrated circuit U1.
Compared with the prior art, the utility model has the beneficial effects that: the utility model combines the audio improvement together while completing the audio amplification, and completes two functions through the TDA2822 and the peripheral circuit thereof, and has simple structure and fewer used devices.
Drawings
Fig. 1 is a schematic diagram of an audio signal amplifying circuit.
Fig. 2 is a circuit diagram of a first part of an audio signal amplifying circuit.
Fig. 3 is a circuit diagram of a second portion of an audio signal amplifying circuit.
Detailed Description
The technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are only some embodiments of the present utility model, but not all embodiments, and all other embodiments obtained by those skilled in the art without making creative efforts based on the embodiments of the present utility model are included in the protection scope of the present utility model.
Referring to fig. 1, an audio signal amplifying circuit includes:
the mains supply module is used for outputting 220V alternating current and supplying the 220V alternating current to the step-down rectifying and filtering module;
the voltage-reducing rectification filter module is used for converting 220V alternating current into direct current and outputting the direct current to the voltage-stabilizing module;
the voltage stabilizing module is used for outputting stable direct current and supplying the stable direct current to the audio receiving module and the audio amplifying module;
the audio receiving module is used for receiving the audio signal and outputting the audio signal to the audio amplifying module;
the audio amplifying module is used for completing audio amplification and audio improvement;
the commercial power supply module is connected with the step-down rectifying and filtering module, the step-down rectifying and filtering module is connected with the voltage stabilizing module, the voltage stabilizing module is connected with the audio receiving module and the audio amplifying module, and the audio receiving module is connected with the audio amplifying module.
In this embodiment: referring to fig. 2, the buck rectifying and filtering module includes a transformer W, a rectifier T, a capacitor C1, a capacitor C2, and an inductor L1, wherein an input end of the transformer W is connected to the mains supply module, one end of an output end of the transformer W is connected to a first end of the rectifier T, the other end of the output end of the transformer W is connected to a third end of the rectifier T, a second end of the rectifier T is grounded, a fourth end of the rectifier T is connected to one end of the capacitor C1 and one end of the inductor L1, the other end of the capacitor C1 is grounded, the other end of the inductor L1 is connected to one end of the capacitor C2 and the voltage stabilizing module, and the other end of the capacitor C2 is grounded.
The voltage reduction of 220V is completed through the transformer W, the AC-DC conversion is completed through the rectifier T, and the filtering processing is completed through a filter circuit consisting of the capacitor C1, the capacitor C2 and the inductor L1.
In this embodiment: referring to fig. 2, the voltage stabilizing module includes a resistor R1, a diode D1, a voltage stabilizer U1, a resistor R2, a first potentiometer RP1, and a capacitor C3, wherein one end of the resistor R1 is connected to the buck rectifying and filtering module, the other end of the resistor R1 is connected to the anode of the diode D1 and the input end of the voltage stabilizer U1, the cathode of the diode D1 is grounded, the ground end of the voltage stabilizer U1 is connected to one end of the resistor R2 and one end of the first potentiometer RP1, the other end of the first potentiometer RP1 is grounded, the output end of the voltage stabilizer U1 is connected to the other end of the resistor R2, one end of the capacitor C3, the audio receiving module, and the other end of the capacitor C3 is grounded.
The resistor R1 is used for limiting current, the diode D1 is a light emitting diode and used for power-on indication, the voltage between the ground terminal and the output terminal of the voltage stabilizer U1 is constant (the voltage depends on different voltage stabilizer models), and the voltage on the capacitor C3 is changed by adjusting the resistance value of the first potentiometer RP 1.
In this embodiment: referring to fig. 3, the audio receiving module includes a capacitor C4, a resistor R3, a capacitor C5, a resistor R4, a microphone MIC, and a capacitor C6, wherein one end of the capacitor C4 is connected to one end of the resistor R3 and the voltage stabilizing module, the other end of the capacitor C4 is grounded, the other end of the resistor R3 is connected to one end of the capacitor C5 and one end of the resistor R4, the other end of the resistor C5 is grounded, the other end of the resistor R4 is connected to one end of the microphone MIC and one end of the capacitor C6, the other end of the microphone MIC is grounded, and the other end of the capacitor C6 is connected to the audio amplifying module.
When the audio signal is not input through the microphone MIC, the microphone MIC presents a high level, the capacitor C6 is connected with alternating current to isolate direct current, and the voltage signal is not output for the audio amplifying module; when the microphone MIC receives an audio signal, the audio signal is converted into an electric signal, and the level at the microphone MIC fluctuates and is output to the audio amplifying module through the capacitor C6.
In this embodiment: referring to fig. 3, the audio amplifying module includes a second potentiometer RP2, a capacitor C7, a capacitor C8, an integrated circuit U2, and a SPEAKER speake, where the model of the integrated circuit U2 is TDA2822, one end of the second potentiometer RP2 is connected to one end of the capacitor C8, the other end of the capacitor C8 is connected to the 6 pin of the integrated circuit U2, the other end of the second potentiometer RP2 is connected to one end of the capacitor C7, the other end of the capacitor C7 is connected to the 8 pin of the integrated circuit U2, the sliding end of the second potentiometer RP2 is connected to the 7 pin of the integrated circuit U2, the 4 pin of the integrated circuit U2 is grounded, the 2 pin of the integrated circuit U2 is connected to the voltage stabilizing module, the 1 pin of the integrated circuit U2 is connected to one end of the SPEAKER speak, and the other end of the SPEAKER speak is connected to the 3 pin of the integrated circuit U1.
TDA2822 is commonly used as an audio amplifier in pocket cassette players, radio recorders and multimedia active speakers. The circuit has the characteristics of simple circuit, good tone quality, wide voltage range and the like, and can work under the circuit form of stereo and bridge amplification. The TDA2822 amplifies the input signal, and outputs the signal through the SPEAKER, and the signal is connected to a BTL output circuit (composed of two groups of power amplifiers, the pin No. 6 and the pin No. 7 are the in-phase input ends of the built-in amplifiers), so as to achieve the purposes of improving the sound quality and reducing the distortion.
The working principle of the utility model is as follows: the mains supply module outputs 220V alternating current and supplies the 220V alternating current to the step-down rectifying and filtering module; the voltage-reducing rectification filter module converts 220V alternating current into direct current and outputs the direct current to the voltage-stabilizing module; the voltage stabilizing module outputs stable direct current and supplies the stable direct current to the audio receiving module and the audio amplifying module; the audio receiving module receives the audio signal and outputs the audio signal to the audio amplifying module; the audio amplification module completes audio amplification and audio improvement.
It will be evident to those skilled in the art that the utility model is not limited to the details of the foregoing illustrative embodiments, and that the present utility model may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the utility model being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is provided for clarity only, and that the disclosure is not limited to the embodiments described in detail below, and that the embodiments described in the examples may be combined as appropriate to form other embodiments that will be apparent to those skilled in the art.
Claims (5)
1. An audio signal amplifying circuit, characterized in that:
the audio signal amplifying circuit includes:
the mains supply module is used for outputting 220V alternating current and supplying the 220V alternating current to the step-down rectifying and filtering module;
the voltage-reducing rectification filter module is used for converting 220V alternating current into direct current and outputting the direct current to the voltage-stabilizing module;
the voltage stabilizing module is used for outputting stable direct current and supplying the stable direct current to the audio receiving module and the audio amplifying module;
the audio receiving module is used for receiving the audio signal and outputting the audio signal to the audio amplifying module;
the audio amplifying module is used for completing audio amplification and audio improvement;
the commercial power supply module is connected with the step-down rectifying and filtering module, the step-down rectifying and filtering module is connected with the voltage stabilizing module, the voltage stabilizing module is connected with the audio receiving module and the audio amplifying module, and the audio receiving module is connected with the audio amplifying module.
2. The audio signal amplifying circuit according to claim 1, wherein the buck rectifying filter module comprises a transformer W, a rectifier T, a capacitor C1, a capacitor C2, and an inductor L1, wherein an input end of the transformer W is connected to the mains power module, an output end of the transformer W is connected to a first end of the rectifier T, an output end of the transformer W is connected to a third end of the rectifier T, a second end of the rectifier T is grounded, a fourth end of the rectifier T is connected to one end of the capacitor C1 and one end of the inductor L1, another end of the capacitor C1 is grounded, another end of the inductor L1 is connected to one end of the capacitor C2, and another end of the capacitor C2 is grounded.
3. The audio signal amplifying circuit according to claim 1, wherein the voltage stabilizing module comprises a resistor R1, a diode D1, a voltage stabilizer U1, a resistor R2, a first potentiometer RP1, and a capacitor C3, one end of the resistor R1 is connected to the buck rectifying filter module, the other end of the resistor R1 is connected to the positive electrode of the diode D1 and the input end of the voltage stabilizer U1, the negative electrode of the diode D1 is grounded, the ground end of the voltage stabilizer U1 is connected to one end of the resistor R2 and one end of the first potentiometer RP1, the other end of the first potentiometer RP1 is grounded, the output end of the voltage stabilizer U1 is connected to the other end of the resistor R2, one end of the capacitor C3, the audio receiving module, the audio amplifying module, and the other end of the capacitor C3 is grounded.
4. The audio signal amplifying circuit according to claim 2 or 3, wherein the audio receiving module comprises a capacitor C4, a resistor R3, a capacitor C5, a resistor R4, a microphone MIC, and a capacitor C6, one end of the capacitor C4 is connected to one end of the resistor R3, the voltage stabilizing module is grounded, the other end of the capacitor C4 is grounded, the other end of the resistor R3 is connected to one end of the capacitor C5, one end of the resistor R4 is grounded, the other end of the resistor R4 is connected to one end of the microphone MIC, one end of the capacitor C6, and the other end of the microphone MIC is grounded, and the other end of the capacitor C6 is connected to the audio amplifying module.
5. The audio signal amplifying circuit according to claim 1, wherein the audio amplifying module comprises a second potentiometer RP2, a capacitor C7, a capacitor C8, an integrated circuit U2, and a SPEAKER speake, the model of the integrated circuit U2 is TDA2822, one end of the second potentiometer RP2 is connected to one end of the capacitor C8, the audio receiving module, the other end of the capacitor C8 is connected to pin 6 of the integrated circuit U2, the other end of the second potentiometer RP2 is connected to one end of the capacitor C7, the other end of the capacitor C7 is connected to pin 8 of the integrated circuit U2, the sliding end of the second potentiometer RP2 is connected to pin 7 of the integrated circuit U2, pin 4 of the integrated circuit U2 is grounded, pin 2 of the integrated circuit U2 is connected to the voltage stabilizing module, pin 1 of the integrated circuit U2 is connected to pin of the SPEAKER speak, and the other end of the SPEAKER speak is connected to pin 3 of the integrated circuit U1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321358213.2U CN220043648U (en) | 2023-05-30 | 2023-05-30 | Audio signal amplifying circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321358213.2U CN220043648U (en) | 2023-05-30 | 2023-05-30 | Audio signal amplifying circuit |
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| Publication Number | Publication Date |
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| CN220043648U true CN220043648U (en) | 2023-11-17 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202321358213.2U Active CN220043648U (en) | 2023-05-30 | 2023-05-30 | Audio signal amplifying circuit |
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| CN (1) | CN220043648U (en) |
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- 2023-05-30 CN CN202321358213.2U patent/CN220043648U/en active Active
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