CN210899581U - High-fidelity audio power amplifier device - Google Patents
High-fidelity audio power amplifier device Download PDFInfo
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- CN210899581U CN210899581U CN202020210837.XU CN202020210837U CN210899581U CN 210899581 U CN210899581 U CN 210899581U CN 202020210837 U CN202020210837 U CN 202020210837U CN 210899581 U CN210899581 U CN 210899581U
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Abstract
The utility model discloses a high-fidelity audio power amplifier device, including singlechip, bluetooth receiving module, LED display module, audio signal source, preamplification circuit, active filter circuit, tone regulating circuit, OLC power amplification circuit and load, audio signal source's output and singlechip, bluetooth receiving module and preamplification circuit's input are connected, the output and the LED display module's of singlechip input are connected, bluetooth receiving module's signal output part is connected with singlechip and preamplification circuit's input respectively, preamplification circuit's signal output part is connected with active filter circuit's signal reception end. The utility model discloses a high-fidelity power amplifier distortion is little, interference immunity is strong, output signal stability is high, gain range scheduling advantage such as big, has satisfied contemporary music fan's demand, enjoys the audio-visual feast that the cinema is generally shocked, has very high practical value.
Description
Technical Field
The utility model relates to an audio signal transmits relevant technical field, specifically is a high-fidelity audio power amplifier device.
Background
Along with the rapid development of electronic technology and scientific technology, the living standard of people is continuously improved, and when the material culture is satisfied, the mental culture requirements also become an indispensable part in modern life, taking the pursuit of 'audio-visual' sense organ aspect as an example, high-quality audio power amplification sound equipment gradually becomes the pursuit of people in life, and meanwhile, audio is also a very important transmission medium in life multimedia, so that the requirements of the audio power amplifier on output power and output tone quality are higher and higher; the frequency range of sounds that people can hear in normal life is about: 20Hz-20kHz, and is generally distributed in the following parts: 300Hz-4 kHz.
However, the music played at ordinary times contains other natural sounds, and the frequency ranges of the sounds are distributed in the whole range, so that more noise is contained in the music heard by people, the quality of audio is low, and the sensory experience of people is influenced.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a high-fidelity audio power amplifier device to solve the music of putting at ordinary times of mentioning in the above-mentioned background art and contained the sound in other nature, their frequency range is the gamut distribution, so contain more murmur in the music that people heard, the quality of audio frequency is lower, influences the problem that people's sense organ experienced.
In order to achieve the above object, the utility model provides a following technical scheme: a high fidelity audio power amplifier device comprises a singlechip, a Bluetooth receiving module, an LED display module, an audio signal source, a pre-amplifying circuit, an active filter circuit, a tone adjusting circuit, an OLC power amplifying circuit and a load, the output end of the audio signal source is connected with the input ends of the singlechip, the Bluetooth receiving module and the pre-amplifying circuit, the output end of the singlechip is connected with the input end of the LED display module, the signal output end of the Bluetooth receiving module is respectively connected with the singlechip and the input end of the preamplifier circuit, the signal output end of the preamplification circuit is connected with the signal receiving end of the active filter circuit, the signal output end of the active filter circuit is connected with the signal receiving end of the tone adjusting circuit, the signal output end of the tone adjusting circuit is connected with the signal receiving end of the OLC power amplifying circuit, and the signal output end of the OLC power amplifying circuit is connected with the signal receiving end of the load.
Preferably, the preamplifier circuit adopts an operational amplifier with the model NE5532, and the passband amplified by the NE5532 operational amplifier is 10 MHz.
Preferably, the active filter circuit adopts an active filter with the model number of NE 5532.
Preferably, the tone adjusting circuit is a treble and bass adjustable circuit, and the audio signal used by the tone adjusting circuit is a stereo input and a stereo output.
Preferably, the OLC power amplifier circuit adopts an LM3886 OC power amplifier circuit.
Preferably, the load is any one of a sound and a horn.
Preferably, the power supply circuit is further included, and the power supply circuit is respectively connected with the single chip microcomputer, the bluetooth receiving module, the LED display module, the pre-amplification circuit, the active filter circuit, the tone adjusting circuit and the OLC power amplification circuit through wires.
The utility model provides a high-fidelity audio power amplifier device possesses following beneficial effect:
the utility model discloses an adopt NE5532 fortune to put and constitute four orders active filter and amplify as audio input's filtering and preceding stage, adopt fortune to put negative feedback formula tone controller as tone regulating circuit, choose LM3886 for use as final power amplification, output can reach 60W, utilize singlechip FFT conversion to realize music frequency spectrum display, realize remote wireless audio input through the bluetooth, the high-fidelity power amplifier distortion of design is little, interference immunity is strong, output signal stability is high, gain range scheduling advantage such as big, the demand of modern music fan has been satisfied, enjoy the audio-visual feast that cinema shocked like, and has very high practical value.
Drawings
FIG. 1 is a schematic structural diagram of an overall module of the present invention;
fig. 2 is a schematic diagram of the power circuit structure of the present invention;
FIG. 3 is a schematic diagram of a pre-amplifier circuit structure according to the present invention;
fig. 4 is a schematic diagram of the structure of the active filter circuit of the present invention;
FIG. 5 is a schematic diagram of the tone adjusting circuit of the present invention;
fig. 6 is a schematic diagram of the OLC power amplifying circuit of the present invention;
fig. 7 is a schematic block diagram of a music spectrum system of the present invention;
in the figure: 1. a single chip microcomputer; 2. a Bluetooth receiving module; 3. an LED display module; 4. an audio signal source; 5. a pre-amplification circuit; 6. an active filter circuit; 7. a tone adjusting circuit; 8. an OLC power amplifying circuit; 9. and (4) loading.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.
As shown in fig. 1-7, the utility model provides a technical solution: a high-fidelity audio power amplifier device comprises a single chip microcomputer 1, a Bluetooth receiving module 2, an LED display module 3, an audio signal source 4, a pre-amplifying circuit 5, an active filter circuit 6, a tone adjusting circuit 7, an OLC power amplifying circuit 8 and a load 9, wherein the output end of the audio signal source 4 is connected with the input ends of the single chip microcomputer 1, the Bluetooth receiving module 2 and the pre-amplifying circuit 5, the output end of the single chip microcomputer 1 is connected with the input end of the LED display module 3, the signal output end of the Bluetooth receiving module 2 is respectively connected with the input ends of the single chip microcomputer 1 and the pre-amplifying circuit 5, the signal output end of the pre-amplifying circuit 5 is connected with the signal receiving end of the active filter circuit 6, the signal output end of the active filter circuit 6 is connected with the signal receiving end of the tone adjusting circuit 7, the signal output end of the tone adjusting circuit 7 is connected with the signal receiving end of the OLC power amplifying, and the signal output end of the OLC power amplifying circuit 8 is connected with the signal receiving end of a load 9.
The preamplifier circuit 5 adopts an operational amplifier with the model of NE5532, and the passband of the amplification of the NE5532 operational amplifier is 10 MHz; the dual operational amplifier chip with higher gain is adopted, and meanwhile, the dual operational amplifier chip has the advantages of small in-band fluctuation, high integration level and easiness in design.
The active filter circuit 6 adopts an active filter with the model of NE 5532; the defects of harmonic suppression and reactive compensation methods of passive filters can be overcome, dynamic tracking compensation can be realized, and therefore the filter effect is better, and the passive filter is more suitable for high-tone-quality power amplifiers.
The tone adjusting circuit 7 is a high-pitch and low-pitch adjustable circuit, and the audio signals adopted by the tone adjusting circuit 7 are stereo input and stereo output; the method is characterized in that left channel tuning and right channel tuning are respectively carried out on stereo audio amplified from a preceding stage in a tuning circuit, the adjusting modes are the same, audio input is adopted, the signal intensity of the audio is firstly improved through front-end amplification, then the audio is selected and adjusted through a high-tone frequency band and a low-tone frequency band, the effect of selecting and outputting high-frequency and low-frequency passband to adjust the tone is achieved, and finally, left and right audio signals are output through a tail-end operational amplifier.
The OLC power amplifying circuit 8 adopts an LM3886 OCL power amplifying circuit; the main function of the power amplifier is to match the load of the audio output (typically a speaker) to better provide the required output power, and the OCL power amplifier circuit is a directly coupled power amplifier with correspondingly wide frequency band, good dynamic characteristics and high fidelity. Simultaneously, the LM3886 OCL power amplifier circuit 8 is adopted to have the functions of overcurrent protection, overheat protection, overvoltage protection, self-starting, noise elimination and the like which are generated by the chip when the input power is too high, so that the stability of the circuit is well protected, and as shown in fig. 6, the LM3886 chip can continuously output a plurality of different power sections which are respectively: 60W/4 Ω (VCC = ± 28V)30W/8 Ω (VCC = ± 28V) 50W/8 Ω (VCC = ± 35V), the last one is adopted in the design, and the chip has low distortion and low noise, and is suitable for the selection of a power amplifier of an audio signal, wherein the influence of each component in the circuit on the whole circuit is as follows:
(1) in pins 1, 4 and 5, a power supply decoupling capacitor can be generally arranged on a power supply input part, the value of the power supply decoupling capacitor is between 0.01uF and 1uF, and different capacitance values and capacitance brands are used to respectively have different influences on audio signals.
(2) The mute loop can be realized by the C43 and R41 capacitors, the mute time is realized by changing the capacitance and resistance of the capacitor, and the available value range of the capacitor in the circuit is as follows: between 10uF and 100uF, the range of the resistance value can be: between 10K and 100K, if the time for muting the circuit is longer, the two values need to be correspondingly increased, but the circuit has no great influence on the sound quality of the power amplifier, the position can be freely set, and the withstand voltage value of the capacitor needs to be more than 50V.
(3) The output end of the circuit is provided with C45 and R44 which form a 'Ruebel network' circuit, the output inductor and a loop formed by the output inductor can play a role of a stabilizing circuit, the value range of C45 can be 0.01-0.22 uF when the circuit is set, and the value range of R44 is as follows: 1-22 omega, the stable condition of a general circuit can be seen from the value of a capacitor and the selected power of a resistor in the circuit, and the stable condition is found through multiple selection: the larger the values used for the capacitance and resistance in the circuit, the better the circuit stability. The design selects the following capacitors: 473, the resistance is the cement resistance of 8 ohms, when looking up the data on the net, know that it is not very big to install the influence on the circuit in fact, just install the stability to the circuit and can be good.
(4) A resistor and an inductor can be connected in parallel on an output circuit of the circuit, the function of the circuit is to isolate electromotive force formed by a signal rebounded by a load (loudspeaker) of the output circuit, meanwhile, the value of the inductor and the resistor has certain influence on the output of circuit audio frequency, generally, an enamelled wire with the diameter of about 6mm is wound for 15-20 circles in the circuit to form an inductor with the diameter of about 6mm, and a cement resistor with the diameter of 10-22 ohm 1W is penetrated in the middle of the inductor.
(5) The values of the two resistors R42 and R43 in the feedback loop determine the closed-loop gain of the amplifier circuit, i.e. the amplification factor of the power amplifier circuit, and the calculation formula is as follows: R43/R42+1, the value range of R43 in the circuit is: between 33K and 56K, the value range of R2 is as follows: 1K-3.3K, it should be noted that the different matching of the two resistors has a large influence on the audio signal, which may cause different output sounds. In the design, R42 is selected to be 1K, R43 to 33K, the amplification factor of the circuit is calculated to be about 34 times, and if the level of the output of the previous stage amplifier of the circuit is lower, the amplification factor can be increased properly in the circuit.
(6) C44 in the figure is a feedback capacitor of the circuit, the orientation of the output audio frequency of the circuit is mainly related to the material and brand of the capacitor used by the capacitor and the size of the selected capacitance value, and the comparison of the capacitor material selection concludes that the audio frequency output tone quality is the best when the audio frequency special-purpose electrodeless capacitor is used, and the value range is: between 10Uf and 100Uf, if the capacitance used in the circuit is larger, the low-frequency signal part in the circuit becomes deeper, and the high-frequency signal part becomes relatively lower (of course, different capacitances are used in the circuit to change different tone qualities, and different tone qualities can be realized by changing the capacitance), otherwise, the tone quality changes of the circuit are different. The value of the capacitor selected by the design is 100 uF.
(7) C45 in the figure is a compensation capacitor of the circuit, and mainly adjusts the square wave response existing in the circuit by adjusting the value of the capacitor, namely the problem of circuit rising edge overshoot, the existence of the problem has a considerable influence on the audio frequency of high-pitched parts, and if the capacitor is not adjusted, the output sound quality of the whole system is not good. The value of 10pf is selected in the design, which can well eliminate the problem of rising edge overshoot, and can be slightly adjusted between 15P and 22P in an actual circuit. C42 is also a compensation capacitor of the circuit, but the capacitor is mainly a part that affects the middle and high frequency bands in the audio signal, and the capacitor in the power amplifying circuit can be a capacitor made of a thin film material, and the value range is as follows: 150pf to 330pf, the value of the capacitance selected by the design is 120 pf.
(9) In the figure, two resistors R39 and R40 are the ground resistance of the LM3886 in the circuit, the input impedance of the amplifier circuit is determined by the values of the two resistors at the same time, in the circuit, R40 is generally 1K, the value range of R39 is slightly larger, and the value range is: between 18K ~33K, the value of these two resistances can be referred to the output impedance size of the preceding level of amplifier circuit of circuit and choose for use assorted value, and this design adoption value is: r39 is 22K, R40 is 1K.
(10) C41 in the figure is an input capacitor of the circuit, the selection of the capacitor material brand and the capacity value of the capacitor have some influence on the audio signal output tone quality of the amplifying circuit, and through multiple material selection changes, the final conclusion is that the electrodeless capacitor audio power amplifying circuit special for audio is selected to output the best tone quality, and the value range of the capacitor is as follows: the capacitance value selected by the design is 3.3uF between 2uF and 10 uF.
The load 9 is any one of a sound box and a loudspeaker, and the processed audio frequency is played through the sound box and the loudspeaker.
The system is characterized by further comprising a power supply circuit, wherein the power supply circuit is respectively connected with the single chip microcomputer 1, the Bluetooth receiving module 2, the LED display module 3, the pre-amplification circuit 5, the active filter circuit 6, the tone adjusting circuit 7 and the OLC power amplification circuit 8 through leads; the direct current power supply in the power supply circuit design is formed by transforming, rectifying, filtering and stabilizing the 22V alternating current in life through a power supply module, and can directly output 29V alternating voltage and output 15V alternating voltage through LM317 and LM337 voltage stabilization. Meanwhile, the audio signal is minimally interfered by a power supply in the whole power amplification process, a three-terminal voltage-stabilizing tube is used as a voltage-stabilizing chip of the power supply module, and a ring transformer is used as a transformer. The toroidal transformer has strong instantaneous overload capacity and high response speed, and can meet the characteristics of large power consumption change and large amplitude change of the audio power amplifier. The annular transformer is not easy to generate noise, and the power amplifier board ensures full sound and good tone quality;
the music frequency spectrum system is characterized by further comprising a music frequency spectrum system, and the music frequency spectrum system is composed of a single-chip microcomputer STC12C5A60S2 frequency spectrum LED display circuit and the like, wherein the music frequency spectrum is based on the single-chip microcomputer to sample and quantize an input audio signal, then a fast Fourier transform algorithm capable of realizing fast Fourier transform is adopted, the power of each evaluation component of the audio signal is calculated in a frequency range, finally the audio signal frequency spectrum is displayed through an LED lamp, according to the system requirements, an MSP430 internal A/D module is adopted to sample, extract and quantize the audio signal to convert a continuous signal into a discrete signal, then the power of each frequency component of the audio signal is calculated through the single-chip microcomputer Fourier transform, and the power of each frequency component of the audio signal is calculated.
In conclusion, the power amplifier can realize power amplification with the frequency of 20HZ-20kHZ, and has wide frequency band; the amplified output waveform is not distorted and is matched with the load of the loudspeaker, the waveform is relatively stable in the whole process, and the signal distortion degree is low; the audio frequency corresponding to the bass, treble and mediant can be selectively amplified, and the controllable gain range is large; the front-stage amplification and the rear-stage power amplification are combined to achieve about 30 times of amplification, the output power can reach 60W, and the amplification factor is high;
the utility model discloses an adopt NE5532 fortune to put and constitute four-order active filter and the preceding stage of audio input and enlarge, adopt the fortune to put negative feedback formula tone controller as tone regulating circuit, choose LM3886 as the final power amplification for use, output can reach 60W, utilize singlechip FFT conversion to realize the music frequency spectrum and show, realize remote wireless audio input through the bluetooth, through actual experience and test show, the high-fidelity power amplifier distortion of design is little, interference immunity is strong, output signal stability is high, gain range scheduling advantage such as big, the demand of contemporary music fan has been satisfied, enjoy the seeing and hearing feast that cinema is shocked as usual, and has very high practical value.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (7)
1. A high-fidelity audio power amplifier device is characterized by comprising a singlechip (1), a Bluetooth receiving module (2), an LED display module (3), an audio signal source (4), a pre-amplifying circuit (5), an active filter circuit (6), a tone adjusting circuit (7), an OLC power amplifying circuit (8) and a load (9), wherein the output end of the audio signal source (4) is connected with the input ends of the singlechip (1), the Bluetooth receiving module (2) and the pre-amplifying circuit (5), the output end of the singlechip (1) is connected with the input end of the LED display module (3), the signal output end of the Bluetooth receiving module (2) is respectively connected with the input ends of the singlechip (1) and the pre-amplifying circuit (5), the signal output end of the pre-amplifying circuit (5) is connected with the signal receiving end of the active filter circuit (6), the signal output end of the active filter circuit (6) is connected with the signal receiving end of the tone adjusting circuit (7), the signal output end of the tone adjusting circuit (7) is connected with the signal receiving end of the OLC power amplifying circuit (8), and the signal output end of the OLC power amplifying circuit (8) is connected with the signal receiving end of the load (9).
2. The high-fidelity audio power amplifier device of claim 1, characterized in that: the preamplifier circuit (5) adopts an operational amplifier with the model of NE5532, and the passband of the amplification of the NE5532 operational amplifier is 10 MHz.
3. The high-fidelity audio power amplifier device of claim 1, characterized in that: the active filter circuit (6) adopts an active filter with the model of NE 5532.
4. The high-fidelity audio power amplifier device of claim 1, characterized in that: the tone adjusting circuit (7) is a high-pitch and low-pitch adjustable circuit, and the audio signals adopted by the tone adjusting circuit (7) are stereo input and stereo output.
5. The high-fidelity audio power amplifier device of claim 1, characterized in that: the OLC power amplifying circuit (8) adopts an LM3886 OC power amplifying circuit.
6. The high-fidelity audio power amplifier device of claim 1, characterized in that: the load (9) is any one of a sound box and a loudspeaker.
7. The high-fidelity audio power amplifier device of claim 1, characterized in that: the LED display device is characterized by further comprising a power supply circuit, wherein the power supply circuit is respectively connected with the single chip microcomputer (1), the Bluetooth receiving module (2), the LED display module (3), the pre-amplification circuit (5), the active filter circuit (6), the tone adjusting circuit (7) and the OLC power amplification circuit (8) through wires.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020210837.XU CN210899581U (en) | 2020-02-26 | 2020-02-26 | High-fidelity audio power amplifier device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020210837.XU CN210899581U (en) | 2020-02-26 | 2020-02-26 | High-fidelity audio power amplifier device |
Publications (1)
| Publication Number | Publication Date |
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| CN210899581U true CN210899581U (en) | 2020-06-30 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020210837.XU Expired - Fee Related CN210899581U (en) | 2020-02-26 | 2020-02-26 | High-fidelity audio power amplifier device |
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| Country | Link |
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| CN (1) | CN210899581U (en) |
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2020
- 2020-02-26 CN CN202020210837.XU patent/CN210899581U/en not_active Expired - Fee Related
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Granted publication date: 20200630 Termination date: 20210226 |
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| CF01 | Termination of patent right due to non-payment of annual fee |