CN218336389U - Low-noise sound power amplifier control circuit and device - Google Patents
Low-noise sound power amplifier control circuit and device Download PDFInfo
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- CN218336389U CN218336389U CN202222015536.3U CN202222015536U CN218336389U CN 218336389 U CN218336389 U CN 218336389U CN 202222015536 U CN202222015536 U CN 202222015536U CN 218336389 U CN218336389 U CN 218336389U
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Abstract
The utility model discloses a stereo set power amplifier control circuit and device of low noise, include: the power supply module, the main control module, the prepositive amplification module, the digital audio power amplification module and the power amplification on-off protection module are arranged in the power supply module; the digital audio power amplifier module comprises a first digital audio power amplifier unit and a second digital audio power amplifier unit; the power amplifier on-off protection module comprises a first power amplifier on-off protection unit and a second power amplifier on-off protection unit; the main control module is electrically connected with the pre-amplification module, and the pre-amplification module is respectively electrically connected with the first digital audio power amplification unit and the second digital audio power amplification unit; the first power amplifier on-off protection unit is electrically connected with the first digital audio power amplifier unit, the second power amplifier on-off protection unit is electrically connected with the second digital audio power amplifier unit, and the main control module is electrically connected with the first power amplifier on-off protection unit and the second power amplifier on-off protection unit respectively. The utility model discloses effectively promote the output efficiency of stereo set power amplifier, the reliability is high.
Description
Technical Field
The utility model relates to a stereo set control technology field especially relates to a stereo set power amplifier control circuit and device of low noise.
Background
In the prior art, based on the requirements of cost and small volume and external dimension, a switch power supply part and an audio power amplifier part for supplying power are combined on the same PCBA. Because the switching power supply can easily generate high ripple noise and high-frequency signal interference, and the sound power amplifier plays a role in signal amplification, very small interference or noise can be amplified to noise which can be easily received by human ears. In addition, the audio power amplifier in the prior art has poor output efficiency, and reduces user experience. Therefore, the invention provides a low-noise sound power amplifier control circuit and a low-noise sound power amplifier control device, which are problems to be solved urgently by technical personnel in the field.
SUMMERY OF THE UTILITY MODEL
The scheme includes that a pre-amplification module performs primary amplification on an audio signal to improve output power; the digital audio power amplification module performs secondary power amplification processing on the audio signal; the power amplifier on-off protection module carries out on-off protection to digital audio power amplifier module, and the surge current that produces when avoiding the on-off is to the impact of speaker, therefore this application noise is low, and output efficiency is high.
In order to solve the technical problem, the application provides a low-noise sound power amplifier control circuit, which comprises a power module, a main control module, a preposed amplification module, a digital audio power amplifier module and a power amplifier on-off protection module; the digital audio power amplifier module comprises a first digital audio power amplifier unit and a second digital audio power amplifier unit; the power amplifier on-off protection module comprises a first power amplifier on-off protection unit and a second power amplifier on-off protection unit;
the power module is respectively and electrically connected with the preamplification module, the digital audio power amplification module and the power amplification on-off protection module, the main control module is electrically connected with the preamplification module, and the preamplification module is respectively and electrically connected with the first digital audio power amplification unit and the second digital audio power amplification unit;
the first power amplifier on-off protection unit is electrically connected with the first digital audio power amplifier unit, the second power amplifier on-off protection unit is electrically connected with the second digital audio power amplifier unit, the main control module is respectively electrically connected with the first power amplifier on-off protection unit and the second power amplifier on-off protection unit, and the first digital audio power amplifier unit and the second digital audio power amplifier unit are connected to the loudspeaker.
Preferably, the pre-amplification module comprises a first pre-amplification unit and a second pre-amplification unit;
the main control module is respectively electrically connected with the first pre-amplification unit and the second pre-amplification unit, the first pre-amplification unit is electrically connected with the first digital audio power amplification unit, and the second pre-amplification unit is electrically connected with the second digital audio power amplification unit.
Preferably, the first digital audio power amplifier unit comprises a first audio amplifier, a feedback subunit, an integrating subunit and a low-pass filtering subunit;
the feedback subunit is electrically connected with the first pre-amplification unit, the integral subunit is electrically connected with the first pre-amplification unit, the low-pass filtering subunit is electrically connected with the loudspeaker, and the first audio amplifier is respectively electrically connected with the feedback subunit, the integral subunit and the low-pass filtering subunit.
Preferably, the first digital audio power amplifier unit further comprises a compensation unit;
the compensation unit is electrically connected with the first audio amplifier and the loudspeaker respectively.
Preferably, the first power amplifier on-off protection unit comprises an optical coupler subunit and a switch control subunit which are electrically connected;
the optical coupler subunit is electrically connected with the power module, the main control module is electrically connected with the optical coupler subunit and the switch control subunit, and the switch control subunit is electrically connected with the first digital audio power amplifier unit.
Preferably, the feedback subunit includes a first resistor and a second resistor;
the first end of the first resistor is electrically connected with the first digital audio power amplifier unit and the negative input end of the first audio amplifier, the second end of the first resistor is electrically connected with the first end of the second resistor and the positive input end of the first audio amplifier, and the second end of the second resistor is electrically connected with the output end of the first audio amplifier.
Preferably, the integrating subunit includes a third resistor, a fourth resistor, a first capacitor, and a second capacitor;
the first end of the third resistor is electrically connected with the feedback subunit, the second end of the third resistor is electrically connected with the negative input end of the first audio amplifier and the first end of the first capacitor respectively, the second end of the first capacitor is electrically connected with the first end of the second capacitor and the first end of the fourth resistor respectively, and the second end of the second capacitor is electrically connected with the second end of the fourth resistor and the comparative amplification input end of the first audio amplifier respectively.
Preferably, the low pass unit includes a first inductor and a third capacitor;
the first end of the first inductor is electrically connected with the feedback subunit and the output end of the first audio amplifier, the second end of the first inductor is electrically connected with the loudspeaker and the first end of the third capacitor, and the second end of the third capacitor is electrically connected with the loudspeaker and the ground.
Preferably, the chip type package of the optical coupler subunit is PC817.
In order to solve the technical problem, the application provides a low-noise sound box power amplifier control device, which comprises a low-noise sound box power amplifier control circuit.
The utility model discloses a stereo set power amplifier control circuit of low noise has following beneficial effect, the utility model discloses a stereo set power amplifier control circuit of low noise includes: the power supply module, the main control module, the prepositive amplification module, the digital audio power amplification module and the power amplification on-off protection module are arranged in the power supply module; the digital audio power amplifier module comprises a first digital audio power amplifier unit and a second digital audio power amplifier unit; the power amplifier on-off protection module comprises a first power amplifier on-off protection unit and a second power amplifier on-off protection unit; the power module is respectively electrically connected with the pre-amplification module, the digital audio power amplifier module and the power amplifier on-off protection module, the main control module is electrically connected with the pre-amplification module, and the pre-amplification module is respectively electrically connected with the first digital audio power amplifier unit and the second digital audio power amplifier unit. The pre-amplification module performs primary amplification on the audio signal to improve the output power; the digital audio power amplification module performs secondary power amplification processing on the audio signal; the power amplifier on-off protection module performs on-off protection on the digital audio power amplifier module, and avoids impact of surge current generated during on-off on the loudspeaker. Therefore, the utility model discloses effectively promote the output efficiency of stereo set power amplifier, reduce the noise, the reliability is high.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the present invention will be further described with reference to the accompanying drawings and embodiments, wherein the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained without inventive efforts according to these drawings:
fig. 1 is a schematic block diagram of a low-noise power amplifier control circuit according to a preferred embodiment of the present invention;
fig. 2 is a schematic block diagram of a low-noise power amplifier control circuit according to a preferred embodiment of the present invention;
fig. 3 is a circuit diagram of a pre-amplification module according to a preferred embodiment of the present invention;
fig. 4 is a circuit diagram of a digital audio power amplifier module 4 according to a preferred embodiment of the present invention;
fig. 5 is a circuit diagram of a power amplifier on/off protection module 5 according to a preferred embodiment of the present invention.
Detailed Description
The core of the application is to provide a low-noise sound power amplifier control circuit and a low-noise sound power amplifier control device, in the scheme, a pre-amplification module performs primary amplification on an audio signal, and output power is improved; the digital audio power amplification module performs secondary power amplification processing on the audio signal; the power amplifier on-off protection module carries out on-off protection to digital audio power amplifier module, and the surge current that produces when avoiding the on-off is to the impact of speaker, therefore this application noise is low, and output efficiency is high.
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application without making any creative effort belong to the protection scope of the present application.
Referring to fig. 1, fig. 1 is a schematic block diagram of a low-noise power amplifier control circuit for a sound device provided in the present application, and the circuit includes a power module 1, a main control module 2, a pre-amplification module 3, a digital audio power amplifier module 4, and a power amplifier on/off protection module 5; the digital audio power amplifier module 4 comprises a first digital audio power amplifier unit 41 and a second digital audio power amplifier unit 42; the power amplifier on-off protection module 5 comprises a first power amplifier on-off protection unit 51 and a second power amplifier on-off protection unit 52;
the power module 1 is respectively and electrically connected with the pre-amplification module 3, the digital audio power amplification module 4 and the power amplification on-off protection module 5, the main control module 2 is electrically connected with the pre-amplification module 3, and the pre-amplification module 3 is respectively and electrically connected with the first digital audio power amplification unit 41 and the second digital audio power amplification unit 42;
the first power amplifier on-off protection unit 51 is electrically connected with the first digital audio power amplifier unit 41, the second power amplifier on-off protection unit 52 is electrically connected with the second digital audio power amplifier unit 42, the main control module 2 is electrically connected with the first power amplifier on-off protection unit 51 and the second power amplifier on-off protection unit 52, and the first digital audio power amplifier unit 41 and the second digital audio power amplifier unit 42 are connected to a loudspeaker.
In the prior art, based on the requirements of cost and small volume and external dimension, a switch power supply part and an audio power amplifier part for supplying power are combined on the same PCBA. Because the switching power supply can easily generate high ripple noise and high-frequency signal interference, and the sound power amplifier plays a role in signal amplification, very small interference or noise can be amplified to noise which can be easily received by human ears. In addition, the audio power amplifier in the prior art has poor output efficiency, and reduces user experience.
Aiming at the defects, the output efficiency of the sound equipment power amplifier is improved through the matching of the power supply module 1, the main control module 2, the pre-amplification module 3, the digital audio power amplifier module 4 and the power amplifier on-off protection module 5, and the reliability is high.
Specifically, the pre-amplification module 3 performs primary amplification on the audio signal to improve the output power; the digital audio power amplification module 4 carries out secondary power amplification processing on the audio signal; the first digital audio power amplification unit 41 performs power amplification on the left channel audio signal, and the second digital audio power amplification unit 42 performs power amplification on the right channel audio signal; the power amplifier on-off protection module 5 performs on-off protection on the digital audio power amplifier module, so that impact of surge current generated during on-off on a loudspeaker is avoided; the first power amplifier on-off protection unit 51 performs on-off protection on the first digital audio power amplifier unit 41, and the second power amplifier on-off protection unit 52 performs on-off protection on the second digital audio power amplifier unit 42.
In conclusion, the application provides a low-noise sound power amplifier control circuit, in the scheme, the pre-amplification module 3 performs primary amplification on an audio signal, so that the output power is improved; the digital audio power amplification module 4 performs secondary power amplification processing on the audio signal; the power amplifier on-off protection module 5 performs on-off protection on the digital audio power amplifier module, so that impact of surge current generated during on-off on the loudspeaker is avoided. Therefore, the utility model discloses effectively promote the output efficiency of stereo set power amplifier, the noise reduction, the reliability is high.
On the basis of the above-described embodiment:
referring to fig. 2, fig. 2 is a schematic block diagram of a low-noise power amplifier control circuit for a sound device according to the present invention.
Referring to fig. 3, fig. 3 is a circuit diagram of a preamplifier module 3 according to the present application.
As a preferred embodiment, the pre-amplification module 3 comprises a first pre-amplification unit 31 and a second pre-amplification unit 32;
the main control module 2 is electrically connected to the first pre-amplification unit 31 and the second pre-amplification unit 32, the first pre-amplification unit 31 is electrically connected to the first digital audio power amplification unit 41, and the second pre-amplification unit 32 is electrically connected to the second digital audio power amplification unit 42.
Specifically, the first pre-amplification unit 31 is configured to perform a first-stage amplification on the left-channel audio signal, and the second pre-amplification unit 32 is configured to perform a first-stage amplification on the right-channel audio signal.
Referring to fig. 4, fig. 4 is a circuit diagram of a first digital audio power amplifier unit 41 according to the present application.
As a preferred embodiment, the first digital audio power amplifier unit 41 includes a first audio amplifier U13, a feedback sub-unit 411, an integrating sub-unit 412 and a low-pass filtering sub-unit 413;
the feedback sub-unit 411 is electrically connected to the first pre-amplifying unit 31, the integrating sub-unit 412 is electrically connected to the first pre-amplifying unit 31, the low-pass filtering sub-unit 413 is electrically connected to the speaker, and the first audio amplifier U13 is electrically connected to the feedback sub-unit 411, the integrating sub-unit 412, and the low-pass filtering sub-unit 413, respectively.
Specifically, the analog audio signal passes through the feedback unit 411 and is then superimposed on the negative input end of the first audio amplifier U13, the superimposed analog audio signal is integrated by the integrating subunit 412 and then sent to the comparator inside the first audio amplifier U13 to obtain a high-frequency square wave signal, the high-frequency square wave signal is power-amplified by the first audio amplifier U13 and then output, and the high-frequency square wave signal is filtered and restored by the low-pass filtering subunit 413 to be an analog audio signal to drive the speaker to play.
As a preferred embodiment, the first digital audio power amplifier unit 41 further includes a compensation unit 414;
the compensation unit 414 is electrically connected to the first audio amplifier U13 and the speaker, respectively.
In particular, the compensation unit 414 is used to make the speaker load appear to be an electrical impedance characteristic to the first audio amplifier U13 output over the operating frequency range, while increasing the stability of the amplifier.
As a preferred embodiment, the first power amplifier on/off protection unit 51 includes an optical coupler subunit 511 and a switch control subunit 512 electrically connected to each other;
the optical coupler subunit 511 is electrically connected with the power module 1, the main control module 2 is electrically connected with the optical coupler subunit and the switch control subunit 512, and the switch control subunit 512 is electrically connected with the first digital audio power amplifier unit 41.
Specifically, when the device is started, an output signal of the power supply module 1 is output to the main control module 2 through the optical coupler unit 511, the main control module 2 outputs a high-level signal after the power supply is stabilized, and the boosted power supply voltage is sent to the digital audio power amplifier module 4, so that noise generated by sudden work of a loudspeaker is avoided;
specifically, when the device is turned off, the system power supply disconnected in a delayed manner enables the main control module 1 to temporarily maintain normal operation, the output signal of the power supply module 1 outputs the high-level signal through the optical coupling subunit 511 to the main control module 2, and the main control module 2 outputs the low-level signal, so that the digital audio power amplification module 4 immediately stops the ancestor and the power supply module 1 is disconnected.
As a preferred embodiment, the feedback subunit includes a first resistor R50 and a second resistor R54;
a first end of the first resistor R50 is electrically connected to the negative input end of the first digital audio amplifier unit 41 and the negative input end of the first audio amplifier U13, a second end of the first resistor R50 is electrically connected to a first end of the second resistor R54 and the positive input end of the first audio amplifier U13, and a second end of the second resistor R54 is electrically connected to the output end of the first audio amplifier U13.
Specifically, the analog audio signal FL _ TO _ IR1 and the output stage IR _ OUT1 are superimposed on the negative input of the first audio amplifier U13 via the feedback signals of the first resistor R50 and the second resistor R54.
As a preferred embodiment, the integrating subunit 412 includes a third resistor R58R61, a fourth resistor R61, a first capacitor C70 and a second capacitor C72;
a first end of the third resistor R58R61 is electrically connected to the feedback subunit 411, a second end of the third resistor R58R61 is electrically connected to a negative input terminal of the first audio amplifier and a first end of the first capacitor C70, a second end of the first capacitor C70 is electrically connected to a first end of the second capacitor C72 and a first end of the fourth resistor R61, and a second end of the second capacitor C72 is electrically connected to a second end of the fourth resistor R61 and a comparative amplification input terminal of the first audio amplifier U13.
Specifically, the superimposed analog audio signal is integrated by a second-order integrator formed by a second-order integrator and a four-resistor R61, a first capacitor C70 and a second capacitor C72, and then is sent to a comparator inside a first audio amplifier U13 to obtain a modulated high-frequency square wave signal; the second-order integrator is an OTA amplifier inside the first audio amplifier U13. In this embodiment, the chip type of the first audio amplifier U13 is IR4301. In another preferred embodiment, the chip type of the first audio amplifier U13 is not particularly limited.
As a preferred embodiment, the low pass unit includes a first inductor L5 and a third capacitor C74;
a first end of the first inductor L5 is electrically connected to the feedback sub-unit 412 and the output end of the first audio amplifier U13, a second end of the first inductor L5 is electrically connected to the speaker and a first end of the third capacitor C74, and a second end of the third capacitor C74 is electrically connected to the speaker and ground.
Specifically, the first audio amplifier U13 amplifies the power of the analog audio signal and outputs the amplified signal through the VS pin of the first audio amplifier U13, and the analog audio signal is filtered and restored through the LC low-pass filter formed by the first inductor L5 and the third capacitor C74 to be an analog audio signal to drive the speaker.
Specifically, the compensation unit 414 includes a fifth resistor R69 and a fourth capacitor C78, and the fifth resistor R69 and the fourth capacitor C78 are connected in parallel with the speaker to form a bass impedance compensation circuit, so as to make the speaker load present an electrical impedance characteristic to the output of the first audio amplifier U13 in the operating frequency range, and simultaneously increase the stability of the audio amplifier.
Referring to fig. 5, fig. 5 is a circuit diagram of a power amplifier on/off protection module 5 according to the present application.
As a preferred embodiment, the chip model number of the optical coupler unit 511 is PC817.
Specifically, when the computer is turned on, the REM signal of 12V passes through the optical coupler unit 511, and the optical coupler unit 511 outputs a low level signal to the main control module 2. The main control module 2 is a singlechip STC15W100; after the singlechip waits for the power supply to be stable after 2s of time delay, the singlechip outputs a high-level control signal to cut off the first triode BG17 and the second triode BG 16; the +5V power supply charges the fifth capacitor C175 through the sixth resistor R149 and the voltage regulator VD31, and the gradually increased voltage of the fifth capacitor C15 is sent to the CSD pin of the first audio amplifier U13 through the resistor R150, the diode VDg in the digital audio power amplifier module, and the resistor R70, thereby preventing the first audio amplifier U13 from suddenly working to generate noise in the speaker.
Specifically, when the system is shut down, the system power supply which is turned off in a delayed manner enables the single chip microcomputer to temporarily maintain normal work, and a 0V REM signal outputs a high-level signal to the single chip microcomputer STC15W100 through the optical coupler unit 511; the singlechip immediately outputs a low-level control signal to make the first triode BG17 and the second triode BG16 be in saturated conduction; the capacitor C175 passes through the transistor BG16. The voltage of-5V is rapidly discharged and is sent to a CSD pin of the first audio amplifier U13 through a resistor R150, a diode VDg in the digital audio power amplifier module and a resistor R70, so that the first audio amplifier U13 immediately stops working, and a system power supply is disconnected. Therefore, the utility model discloses the noise is low and the reliability is high.
The application also provides a low-noise sound power amplifier control device, which comprises a low-noise sound power amplifier control circuit.
Please refer to the above embodiments for the introduction of the low-noise sound power amplifier control circuit provided in this application, which is not described herein again.
It should be noted that, in the present specification, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrases "comprising a," "8230," "8230," or "comprising" does not exclude the presence of additional like elements in a process, method, article, or apparatus that comprises the element.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A low-noise sound power amplifier control circuit is characterized by comprising a power supply module, a main control module, a prepositive amplification module, a digital audio power amplifier module and a power amplifier on-off protection module; the digital audio power amplifier module comprises a first digital audio power amplifier unit and a second digital audio power amplifier unit; the power amplifier on-off protection module comprises a first power amplifier on-off protection unit and a second power amplifier on-off protection unit;
the power supply module is respectively and electrically connected with the pre-amplification module, the digital audio power amplification module and the power amplification on-off protection module, the main control module is electrically connected with the pre-amplification module, and the pre-amplification module is respectively and electrically connected with the first digital audio power amplification unit and the second digital audio power amplification unit;
the first power amplifier on-off protection unit is electrically connected with the first digital audio power amplifier unit, the second power amplifier on-off protection unit is electrically connected with the second digital audio power amplifier unit, the main control module is respectively electrically connected with the first power amplifier on-off protection unit and the second power amplifier on-off protection unit, and the first digital audio power amplifier unit and the second digital audio power amplifier unit are connected to the loudspeaker.
2. The low-noise sound power amplifier control circuit according to claim 1, wherein the pre-amplification module comprises a first pre-amplification unit and a second pre-amplification unit;
the main control module is respectively electrically connected with the first pre-amplification unit and the second pre-amplification unit, the first pre-amplification unit is electrically connected with the first digital audio power amplification unit, and the second pre-amplification unit is electrically connected with the second digital audio power amplification unit.
3. The low-noise sound power amplifier control circuit according to claim 2, wherein the first digital audio power amplifier unit comprises a first audio amplifier, a feedback subunit, an integrating subunit and a low-pass filtering subunit;
the feedback subunit is electrically connected with the first pre-amplification unit, the integral subunit is electrically connected with the first pre-amplification unit, the low-pass filtering subunit is electrically connected with the loudspeaker, and the first audio amplifier is respectively electrically connected with the feedback subunit, the integral subunit and the low-pass filtering subunit.
4. The control circuit of claim 3, wherein the first digital audio power amplifier unit further comprises a compensation unit;
the compensation unit is electrically connected with the first audio amplifier and the loudspeaker respectively.
5. The low-noise sound power amplifier control circuit according to claim 1, wherein the first power amplifier on/off protection unit comprises an optical coupler subunit and an on/off control subunit which are electrically connected;
the optical coupler subunit is electrically connected with the power module, the main control module is electrically connected with the optical coupler subunit and the switch control subunit, and the switch control subunit is electrically connected with the first digital audio power amplifier unit.
6. The control circuit of claim 3, wherein the feedback subunit comprises a first resistor and a second resistor;
the first end of the first resistor is electrically connected with the first digital audio power amplifier unit and the negative input end of the first audio amplifier, the second end of the first resistor is electrically connected with the first end of the second resistor and the positive input end of the first audio amplifier, and the second end of the second resistor is electrically connected with the output end of the first audio amplifier.
7. The control circuit of claim 3, wherein the integrator unit comprises a third resistor, a fourth resistor, a first capacitor and a second capacitor;
the first end of the third resistor is electrically connected with the feedback subunit, the second end of the third resistor is electrically connected with the negative input end of the first audio amplifier and the first end of the first capacitor respectively, the second end of the first capacitor is electrically connected with the first end of the second capacitor and the first end of the fourth resistor respectively, and the second end of the second capacitor is electrically connected with the second end of the fourth resistor and the comparative amplification input end of the first audio amplifier respectively.
8. The control circuit of claim 3, wherein the low pass unit comprises a first inductor and a third capacitor;
the first end of the first inductor is electrically connected with the feedback subunit and the output end of the first audio amplifier, the second end of the first inductor is electrically connected with the loudspeaker and the first end of the third capacitor, and the second end of the third capacitor is electrically connected with the loudspeaker and the ground.
9. The control circuit of claim 5, wherein the chip type package of the optocoupler unit is PC817.
10. A low noise power amplifier control device for audio equipment, comprising the power amplifier control circuit for low noise power amplifier of any one of claims 1 to 9.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222015536.3U CN218336389U (en) | 2022-08-02 | 2022-08-02 | Low-noise sound power amplifier control circuit and device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222015536.3U CN218336389U (en) | 2022-08-02 | 2022-08-02 | Low-noise sound power amplifier control circuit and device |
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| CN218336389U true CN218336389U (en) | 2023-01-17 |
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| CN202222015536.3U Active CN218336389U (en) | 2022-08-02 | 2022-08-02 | Low-noise sound power amplifier control circuit and device |
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