Multi-channel audio amplifying and isolating circuit and device

Abstract

The invention relates to the technical field of audio isolation, and discloses a multichannel audio amplification and isolation circuit reliable and stable in signal transmission, comprising input modules (110, 120) for receiving audio signals input by a pre-stage power amplifier, a potentiometer module (130) and an amplification and isolation module (140), the amplification and isolation module (140) is used for receiving two paths of audio signals input by the potentiometer module (130), and the input modules (110, 120) are used for receiving two paths of audio signals input by the pre-stage power amplifier. And the input audio signal is isolated and amplified, and then the audio signal is output through at least one output module.

Description

Technical Field

[0001] The present invention relates to the technical field of audio isolation, and more specifically to a multi-channel audio amplification isolation circuit and device. Background Art

[0002] To realize the sound reproduction system, some conversion devices are usually used to convert the information representing the desired audio content into an audible sound field. At present, the audio circuit processes the input audio signal and then outputs a suitable audio signal.

[0003] However, when the existing audio circuit directly outputs audio signals to the subsequent module, there may be multiple sets of transmission lines. During the process of transmitting the audio signals, the multiple signals may interfere with each other, thereby affecting the quality of the audio signal transmission.

[0004] Therefore, how to avoid mutual interference when multiple groups of transmission lines transmit audio signals has become a technical problem that technical personnel in this field need to solve urgently. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a multi-channel audio amplification isolation circuit and device with reliable and stable signal transmission, in view of the defect of the prior art that multiple signals in the above-mentioned process of transmitting audio signals may interfere with each other, thereby affecting the quality of audio signal transmission.

[0006] The technical solution adopted by the present invention to solve the technical problem is to construct a multi-channel audio amplification isolation circuit, which has:

[0007] An input module, which is used to receive an audio signal input by a pre-amplifier;

[0008] A potentiometer module, whose input end is connected to the output end of the input module, for receiving the audio signal and adjusting the voltage;

[0009] an amplification isolation module, one input end of which is connected to the second end of the potentiometer module, for receiving an audio signal, isolating and amplifying the audio signal, and then outputting the audio signal through at least one output module,

[0010] The other input end of the amplification isolation module is connected to the third end of the potentiometer module, and is used to receive another audio signal, isolate and amplify the audio signal, and then output the audio signal through at least one output module.

[0011] In some embodiments, the first input terminal of the output module is connected to an output terminal of the amplification and isolation module to receive an audio signal.

[0012] The second input end of the output module is connected to another output end of the amplification and isolation module for receiving another audio signal.

[0013] In some embodiments, the amplification isolation module includes at least a first dual operational amplifier module, wherein:

[0014] The first dual operational amplifier module includes a first branch and a second branch.

[0015] The input end of the first branch is coupled to the second end of the potentiometer module, and is used to receive one channel of the audio signal.

[0016] The input end of the second branch is coupled to the third end of the potentiometer module for receiving another channel of the audio signal.

[0017] In some embodiments, the first branch includes a first coupling circuit, a first amplifier, and a first feedback circuit.

[0018] The input end of the first coupling circuit is connected to the second end of the potentiometer module,

[0019] The output terminal of the first coupling module is coupled to the inverting input terminal of the first amplifier.

[0020] One end of the first feedback circuit is connected to the inverting input end of the first amplifier,

[0021] The other end of the first feedback circuit is connected to the output end of the first amplifier,

[0022] The output end of the first amplifier is connected to an input end of the output module.

[0023] In some embodiments, the second branch includes a second coupling circuit, a second amplifier, and a second feedback circuit.

[0024] The input end of the second coupling circuit is connected to the third end of the potentiometer module.

[0025] The output terminal of the second coupling module is coupled to the inverting input terminal of the second amplifier.

[0026] One end of the second feedback circuit is connected to the inverting input end of the second amplifier.

[0027] The other end of the second feedback circuit is connected to the output end of the second amplifier.

[0028] The output end of the second amplifier is connected to the other input end of the output module.

[0029] In some embodiments, the output module includes a first output module, a second output module, a third output module, a fourth output module and a fifth output module.

[0030] An input end of the first output module, the second output module, the third output module, the fourth output module and the fifth output module is connected to the output end of the first branch,

[0031] Another input end of the first output module, the second output module, the third output module, the fourth output module and the fifth output module is connected to the output end of the second branch.

[0032] In some embodiments, the input module includes a first voltage dividing module and a second voltage dividing module.

[0033] The first voltage divider module and the second voltage divider module are used to receive the audio signal input by the front-stage power amplifier.

[0034] The output end of the first voltage divider module is connected to an input end of the potentiometer module.

[0035] The output end of the second voltage divider module is connected to the other input end of the potentiometer module.

[0036] In some embodiments, the first voltage dividing module includes a first resistor, a second resistor, and a fifth resistor.

[0037] The second resistor is connected in series with the fifth resistor, one end of the first resistor is connected to a connection end of the second resistor and the fifth resistor,

[0038] One end of the fifth resistor is coupled to the other input end of the potentiometer module.

[0039] In some embodiments, the second voltage dividing module includes a third resistor, a fourth resistor and a sixth resistor.

[0040] The third resistor is connected in series with the sixth resistor, one end of the fourth resistor is connected to a connection end of the third resistor and the sixth resistor,

[0041] One end of the sixth resistor is coupled to an input end of the potentiometer module.

[0042] In a second aspect, a multi-channel audio amplification isolation device includes the above-mentioned multi-channel audio amplification isolation circuit, which is used to receive an audio signal output by a power amplifier module, and amplify and isolate the input audio signal, and output the processed audio signal through at least one output module for use by a subsequent stage.

[0043] In the multi-channel audio amplification isolation circuit described in the present invention, it includes an input module for receiving the audio signal input by the front-stage power amplifier, a potentiometer module and an amplification isolation module, wherein the amplification isolation module is used to receive the two-way audio signal input by the potentiometer module, and isolate and amplify the input audio signal, and then output the audio signal through at least one output module. Compared with the prior art, by setting at least two stages of signal processing circuit modules, the front-stage circuit buffers, isolates and amplifies the input audio signal, and then the multi-channel output modules output the audio signal respectively, and the front and rear use operational amplifiers / isolation to achieve that the output audio signals will not interfere with and affect each other, thereby improving the quality of the output audio signal. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] The present invention will be further described below with reference to the accompanying drawings and embodiments, in which:

[0045] Figure 1 It is a circuit diagram of an embodiment of a multi-channel audio amplification isolation circuit provided by the present invention;

[0046] Figure 2 It is a circuit diagram of an embodiment of a first output module provided by the present invention;

[0047] Figure 3 It is a circuit diagram of an embodiment of a second output module provided by the present invention;

[0048] Figure 4 It is a circuit diagram of an embodiment of a third output module provided by the present invention;

[0049] Figure 5 It is a circuit diagram of an embodiment of a fourth output module provided by the present invention;

[0050] Figure 6 This is a circuit diagram of an embodiment of a fifth output module provided by the present invention. DETAILED DESCRIPTION

[0051] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, specific embodiments of the present invention are now described in detail with reference to the accompanying drawings.

[0052] like Figure 1 As shown, in the first embodiment of the multi-channel audio amplification isolation circuit of the present invention, the multi-channel audio amplification isolation circuit 10 includes an input module (110, 120), a potentiometer module 130 and an amplification isolation module 140;

[0053] Wherein, the input module (110, 120) is used to receive the audio signal input by the front-stage power amplifier module;

[0054] The potentiometer module 130 is used to adjust the voltage signal value output by the input module (110, 120);

[0055] The amplification isolation module 140 has the functions of signal receiving, buffering, amplifying and isolating. It is used to receive the audio signal after the voltage is adjusted by the potentiometer module 130, and then divide it into two channels (left channel and right channel) for output after buffering, isolation and amplification.

[0056] Specifically, the input end of the input module (110, 120) is used to receive the audio signal input by the front-stage power amplifier, and after voltage division processing of the input audio signal, output it to the potentiometer module 130;

[0057] The input end (corresponding to IN1, IN2) of the potentiometer module 130 is connected to the output end of the input module (110, 120) to receive the two-channel audio signals after voltage division, and

[0058] The voltage at the input side of the amplification isolation module 140 is adjusted to meet the requirements of two-way audio signal transmission;

[0059] Furthermore, an input end of the amplification isolation module 140 is connected to the second end (corresponding to pin 2) of the potentiometer module 130, for receiving an audio signal, and performing buffering, isolation and amplification processing on the audio signal, and then outputting the audio signal (such as a left channel signal) through at least one output module (20, 30, 40, 50, 60), so that the five signals will not interfere with or affect each other during the transmission process;

[0060] The other input end of the amplification isolation module 140 is connected to the third end (corresponding to pin 3) of the potentiometer module 130, and is used to receive another audio signal, and buffer, isolate and amplify the audio signal, and then output the audio signal (such as the right channel signal) through at least one output module (20, 30, 40, 50, 60), so that the five signals will not interfere with or affect each other during the transmission process.

[0061] By using the technical solution, at least two stages of signal processing circuit modules are provided, and the front-stage circuit buffers, isolates and buffers, isolates and amplifies the input audio signal, and then the multi-channel output module outputs the audio signal respectively. The front-stage and rear-stage signals are both buffered, amplified and isolated, so that the output audio signals will not interfere with and affect each other, and the problem of signal interference in the multi-channel output module (20, 30, 40, 50, 60) during signal transmission can be avoided, thereby improving the quality of the output audio signal.

[0062] In some embodiments, Figure 2-Figure 6As shown, in order to improve the quality of the output audio signal, a plurality of output modules (20, 30, 40, 50, 60) can be provided in the isolation circuit, wherein the first input end (corresponding to the LOUT end) of the output module (20, 30, 40, 50, 60) is respectively connected to an output end (corresponding to the LOUT end) of the amplification isolation module 140, for receiving one channel of audio signal, and performing buffering, isolation and amplification processing on the input one channel of audio signal,

[0063] The second input end (corresponding to the ROUT end) of the output module (20, 30, 40, 50, 60) is connected to another output end (corresponding to the ROUT end) of the amplification isolation module 140, and is used to receive another audio signal and buffer, isolate and amplify the input another audio signal.

[0064] In some embodiments, Figure 1 As shown, in order to improve the quality of the output audio signal, a first dual operational amplifier module (141, 142) can be provided in the amplification isolation module 140, wherein it has good noise performance, good output driving capability and a relatively high small signal bandwidth, and when used for audio signal amplification, it has the characteristics of warm tone and high fidelity;

[0065] Specifically, the first dual operational amplifier module (141, 142) includes a first branch 141 and a second branch 142.

[0066] The input end of the first branch 141 is connected to the second end (corresponding to pin 2) of the potentiometer module 130, and is used to receive an audio signal and perform buffering, isolation and amplification processing on the input audio signal.

[0067] The input end of the second branch 142 is connected to the third end (corresponding to pin 3) of the potentiometer module 130 for receiving another audio signal and performing buffering, isolation and amplification processing on the input another audio signal.

[0068] In some embodiments, Figure 1 As shown, in order to improve the processing effect of the input audio signal, a first coupling circuit, a first amplifier U1A and a first feedback circuit can be set in the first branch 141, wherein the first coupling circuit is used to receive an input audio signal (which is an AC signal),

[0069] The first amplifier U1A has the functions of signal buffering, isolation and amplification.

[0070] The first feedback circuit is used to improve the quality of the output signal. By introducing negative feedback, it can reduce the nonlinear distortion of the amplifier, widen the frequency band, reduce noise and stabilize the working state;

[0071] Specifically, the input end of the first coupling circuit is connected to the second end (corresponding to pin 2) of the potentiometer module 130.

[0072] The output end of the first coupling module is connected to the inverting input end (corresponding to pin 1) of the first amplifier U1A.

[0073] The non-inverting input terminal of the first amplifier U1A (corresponding to the 1+ pin) is connected to the +6V power supply terminal.

[0074] One end of the first feedback circuit is connected to the inverting input end (corresponding to pin 1) of the first amplifier U1A.

[0075] The other end of the first feedback circuit is connected to the output end of the first amplifier U1A (corresponding to the 1OUT pin). The first amplifier U1A is used to receive an audio signal input from the potentiometer module 130, and to buffer, isolate and amplify the input audio signal, and then output it to the subsequent circuit.

[0076] The output end (corresponding to the 1OUT pin) of the first amplifier U1A is respectively connected to an input end (corresponding to LOUT) of the output module (20, 30, 40, 50, 60), and the processed audio signal is respectively input to the output module (20, 30, 40, 50, 60).

[0077] The first coupling circuit is composed of a third capacitor C103 and a ninth resistor R109 connected in series. The input audio signal is input through the third capacitor C103 and the ninth resistor R109, and then input into the inverting input terminal (corresponding to the 1-pin) of the first amplifier U1A.

[0078] The first feedback circuit is composed of a fourth capacitor C104 and a tenth resistor R110 connected in parallel. Part or all of the audio signal output from the output end (corresponding to the 1OUT pin) of the first amplifier U1A is fed back to the inverting input end (corresponding to the 1-pin) through the fourth capacitor C104 and the tenth resistor R110, and then superimposed with the input audio signal, and then buffered, amplified and isolated to improve the quality of the output audio signal.

[0079] In some embodiments, Figure 1 As shown, in order to improve the processing effect of the input audio signal, a second coupling circuit, a second amplifier U1B and a second feedback circuit can be set in the second branch 142.

[0080] The input end of the second coupling circuit is connected to the third end (corresponding to pin 3) of the potentiometer module 130.

[0081] The output end of the second coupling module is connected to the inverting input end (corresponding to pin 2) of the second amplifier U1B.

[0082] One end of the second feedback circuit is connected to the inverting input end (corresponding to pin 2) of the second amplifier U1B.

[0083] The in-phase input terminal of the second amplifier U1B (corresponding to the 2+ pin) is connected to the +6V power supply terminal.

[0084] The other end of the second feedback circuit is connected to the output end of the second amplifier U1B (corresponding to the 2OUT pin). The second amplifier U1B is used to receive another audio signal, and buffer, isolate and amplify the input audio signal, and then output it to the subsequent circuit.

[0085] The output end (corresponding to the 2OUT pin) of the second amplifier U1B is connected to the other input end of the output module (20, 30, 40, 50, 60), and the processed audio signal of the other channel is input into the output module (20, 30, 40, 50, 60) respectively.

[0086] The second coupling circuit is composed of a first capacitor C101 and a seventh resistor R107 connected in series. The other audio signal is input through the first capacitor C101 and the seventh resistor R107, and then input into the inverting input terminal (corresponding to the 2-pin) of the second amplifier U1B.

[0087] The first feedback circuit is composed of a second capacitor C102 and an eighth resistor R108 connected in parallel. Part or all of the audio signal output from the output end (corresponding to the 2OUT pin) of the second amplifier U1B is fed back to the inverting input end (corresponding to the 2-pin) through the second capacitor C102 and the eighth resistor R108, and then superimposed with the input audio signal, and then buffered, amplified and isolated to improve the quality of the output audio signal.

[0088] In some embodiments, Figure 2-Figure 6 As shown, the output module includes a first output module 20, a second output module 30, a third output module 40, a fourth output module 50 and a fifth output module 60.

[0089] Among them, an input end (corresponding to the LOUT end) of the first output module 20, the second output module 30, the third output module 40, the fourth output module 50 and the fifth output module 60 is connected to the output end (corresponding to the LOUT end) of the first branch 141, and is used to receive an audio signal and buffer, isolate and amplify the input audio signal;

[0090] The other input end (corresponding to the ROUT end) of the first output module 20, the second output module 30, the third output module 40, the fourth output module 50 and the fifth output module 60 is connected to the output end (corresponding to the ROUT end) of the second branch 142 for receiving another audio signal and performing buffering, isolation and amplification processing on the input another audio signal.

[0091] In some embodiments, Figure 1 As shown, the input module (110, 120) includes a first voltage dividing module 110 and a second voltage dividing module 120,

[0092] Specifically, the first voltage dividing module 110 and the second voltage dividing module 120 are used to receive the audio signal input by the pre-stage power amplifier.

[0093] The output end of the first voltage divider module 110 is connected to an input end (corresponding to IN1) of the potentiometer module 130 to receive an audio signal;

[0094] The output end of the second voltage divider module 120 is connected to another input end (corresponding to IN2 ) of the potentiometer module 130 for receiving another audio signal.

[0095] In some embodiments, Figure 1 As shown, the first voltage dividing module 110 includes a first resistor R101, a second resistor R102 and a fifth resistor R105.

[0096] Specifically, the second resistor R102 is connected in series with the fifth resistor R105, and one end of the first resistor R101 is connected to the connection end of the second resistor R102 and the fifth resistor R105, for performing voltage division processing on another channel of input audio signal;

[0097] One end of the fifth resistor R105 is connected to the other input end (corresponding to IN2 ) of the potentiometer module 130 .

[0098] In some embodiments, the second voltage dividing module 120 includes a third resistor R103, a fourth resistor R104, and a sixth resistor R106.

[0099] The third resistor R103 and the sixth resistor R106 are connected in series, and one end of the fourth resistor R104 is connected to the connection end of the third resistor R103 and the sixth resistor R106, for performing voltage division processing on an input audio signal;

[0100] One end of the sixth resistor R106 is connected to an input end (corresponding to IN1 ) of the potentiometer module 130 .

[0101] In some embodiments, Figure 2-Figure 6 As shown, a dual operational amplifier module is disposed in each of the first output module 20 , the second output module 30 , the third output module 40 , the fourth output module 50 and the fifth output module 60 .

[0102] Taking the first output module 20 as an example, it includes an input voltage divider circuit (210, 220), a second potentiometer module 230 and a second amplification isolation module 240.

[0103] The input end (corresponding to the ROUT end) of the first input voltage divider circuit 210 is connected to the output end (corresponding to the ROUT end) of the second branch 142 to receive another audio signal;

[0104] The input end (corresponding to the LOUT end) of the second input voltage divider circuit 220 is connected to the output end (corresponding to the LOUT end) of the first branch 141 to receive an audio signal;

[0105] The output end of the first input voltage divider circuit 210 is connected to an input end (corresponding to the IN1 pin) of the second potentiometer module 230, and the received audio signal is input into the second potentiometer module 230.

[0106] The output end of the second input voltage divider circuit 220 is connected to another input end (corresponding to the IN2 pin) of the second potentiometer module 230, and the received audio signal of another channel is input into the second potentiometer module 230.

[0107] The second potentiometer module 230 outputs the voltage-regulated audio signal to the second amplification isolation module 240.

[0108] The second amplification and isolation module 240 includes a first signal processing circuit 241 and a second signal processing circuit 242.

[0109] The signal input end of the first signal processing circuit 241 is connected to the second output end (corresponding to pin 2) of the second potentiometer module 230, and the audio signal is input into the first signal processing circuit 241.

[0110] The signal input end of the second signal processing circuit 242 is connected to the third output end (corresponding to pin 3) of the second potentiometer module 230 , and the audio signal is input into the second signal processing circuit 242 .

[0111] Specifically, the first input voltage divider circuit 210 is composed of a fifth capacitor C201 and an eleventh resistor R201 connected in series, and an audio signal input from the first branch 141 is input to the second potentiometer module 230 via the fifth capacitor C201 and the eleventh resistor R201;

[0112] The second input voltage divider circuit 220 is composed of a sixth capacitor C202 and a twelfth resistor R202 connected in series. The other audio signal input from the second branch 142 is input into the second potentiometer module 230 via the sixth capacitor C202 and the twelfth resistor R202.

[0113] Furthermore, the first signal processing circuit 241 includes a first input circuit, a first operational amplifier module U2A and a first negative feedback circuit.

[0114] One end of the first input circuit is connected to the second output end (corresponding to pin 2) of the second potentiometer module 230.

[0115] The inverting input terminal (corresponding to the 1- terminal) of the first operational amplifier module U2A is connected to the other end of the first input circuit, and the non-inverting input terminal (corresponding to the 1+ terminal) of the first operational amplifier module U2A is connected to the +6V power supply terminal.

[0116] One end of the first negative feedback circuit is connected to the inverting input end (corresponding to the 1-end) of the first operational amplifier module U2A, and the other end of the first negative feedback circuit is connected to the output end (corresponding to the 1OUT end). The audio signal is input into the first operational amplifier module U2A through the first input circuit, and after secondary amplification, it is used by the subsequent modules;

[0117] The second signal processing circuit 242 includes a second input circuit, a second operational amplifier module U2B and a second negative feedback circuit.

[0118] One end of the second input circuit is connected to the third output end (corresponding to pin 3) of the second potentiometer module 230.

[0119] The inverting input terminal (corresponding to the 2- terminal) of the second operational amplifier module U2B is connected to the other end of the second input circuit, and the non-inverting input terminal (corresponding to the 2+ terminal) of the second operational amplifier module U2B is connected to the +6V power supply terminal.

[0120] One end of the second negative feedback circuit is connected to the inverting input end (corresponding to the 2-end) of the second operational amplifier module U2B, and the other end of the second negative feedback circuit is connected to the output end (corresponding to the 2OUT end). The audio signal is input into the second operational amplifier module U2B through the second input circuit, and after secondary amplification, it is used by the subsequent modules.

[0121] Specifically, the first input circuit is composed of a seventh capacitor C203 and a thirteenth resistor R203 connected in series. One-way audio signal is input into the first operational amplifier module U2A through the seventh capacitor C203 and the thirteenth resistor R203, and after secondary amplification, buffering and isolation processing, it is used by the subsequent module;

[0122] The first negative feedback circuit is composed of an eighth capacitor C204 and a fourteenth resistor R204 connected in parallel. Part or all of the audio signal output from the output end (corresponding to the 1OUT pin) of the first operational amplifier module U2A is fed back to the inverting input end (corresponding to the 1-pin) through the eighth capacitor C204 and the fourteenth resistor R204, and after being superimposed with the input audio signal, it is buffered, amplified and isolated to improve the quality of the output audio signal.

[0123] It should be noted that the circuit structures and working principles of the second output module 30 , the third output module 40 , the fourth output module 50 and the fifth output module 60 are the same as those of the first output module 20 , and will not be repeated here.

[0124] In a second aspect, a multi-channel audio amplification isolation device includes the multi-channel audio amplification isolation circuit 10 and output modules (20, 30, 40, 50, 60) described above.

[0125] The multi-channel audio amplification isolation circuit 10 is used to receive the audio signal output by the power amplifier module, and after buffering, amplifying and isolating the input audio signal, the processed audio signal is output through at least one output module (20, 30, 40, 50, 60) for use by the subsequent stage. By setting a multi-channel signal output path at the subsequent stage of the multi-channel audio amplification isolation circuit 10, it is achieved that the five-channel signals will not interfere with or affect each other.

[0126] The embodiments of the present invention are described above in conjunction with the accompanying drawings, but the present invention is not limited to the above-mentioned specific implementation modes, which are merely illustrative rather than restrictive. Under the guidance of the present invention, ordinary technicians in this field can also make many forms without departing from the scope of protection of the present invention and the claims, all of which are within the protection of the present invention.

Claims

1. A multi-channel audio amplification isolation circuit, characterized in that: have: An input module, which is used to receive an audio signal input by a pre-amplifier; A potentiometer module, whose input end is connected to the output end of the input module, for receiving the audio signal and adjusting the voltage; an amplification isolation module, one input end of which is connected to the second end of the potentiometer module, for receiving an audio signal, isolating and amplifying the audio signal, and then outputting the audio signal through at least one output module, The other input end of the amplification isolation module is connected to the third end of the potentiometer module, and is used to receive another audio signal, isolate and amplify the audio signal, and then output the audio signal through at least one output module.

2. The multi-channel audio amplification isolation circuit according to claim 1, characterized in that: The first input terminal of the output module is connected to an output terminal of the amplification isolation module for receiving an audio signal. The second input end of the output module is connected to another output end of the amplification and isolation module for receiving another audio signal.

3. The multi-channel audio amplification isolation circuit according to claim 2, characterized in that: The amplification isolation module at least includes a first dual operational amplifier module, wherein: The first dual operational amplifier module includes a first branch and a second branch. The input end of the first branch is coupled to the second end of the potentiometer module, and is used to receive one channel of the audio signal. The input end of the second branch is coupled to the third end of the potentiometer module for receiving another channel of the audio signal.

4. The multi-channel audio amplification isolation circuit according to claim 3, characterized in that: The first branch includes a first coupling circuit, a first amplifier and a first feedback circuit. The input end of the first coupling circuit is connected to the second end of the potentiometer module, The output terminal of the first coupling module is coupled to the inverting input terminal of the first amplifier. One end of the first feedback circuit is connected to the inverting input end of the first amplifier, The other end of the first feedback circuit is connected to the output end of the first amplifier, The output end of the first amplifier is connected to an input end of the output module.

5. The multi-channel audio amplification isolation circuit according to claim 4, characterized in that: The second branch includes a second coupling circuit, a second amplifier and a second feedback circuit. The input end of the second coupling circuit is connected to the third end of the potentiometer module. The output terminal of the second coupling module is coupled to the inverting input terminal of the second amplifier. One end of the second feedback circuit is connected to the inverting input end of the second amplifier. The other end of the second feedback circuit is connected to the output end of the second amplifier. The output end of the second amplifier is connected to the other input end of the output module.

6. The multi-channel audio amplification isolation circuit according to claim 5, characterized in that: The output module includes a first output module, a second output module, a third output module, a fourth output module and a fifth output module. An input end of the first output module, the second output module, the third output module, the fourth output module and the fifth output module is connected to the output end of the first branch, Another input end of the first output module, the second output module, the third output module, the fourth output module and the fifth output module is connected to the output end of the second branch.

7. The multi-channel audio amplification isolation circuit according to claim 1, characterized in that: The input module includes a first voltage dividing module and a second voltage dividing module. The first voltage divider module and the second voltage divider module are used to receive the audio signal input by the front-stage power amplifier. The output end of the first voltage divider module is connected to an input end of the potentiometer module. The output end of the second voltage divider module is connected to the other input end of the potentiometer module.

8. The multi-channel audio amplification isolation circuit according to claim 7, characterized in that: The first voltage dividing module includes a first resistor, a second resistor and a fifth resistor. The second resistor is connected in series with the fifth resistor, one end of the first resistor is connected to a connection end of the second resistor and the fifth resistor, One end of the fifth resistor is coupled to the other input end of the potentiometer module.

9. The multi-channel audio amplification isolation circuit according to claim 7, characterized in that: The second voltage dividing module includes a third resistor, a fourth resistor and a sixth resistor. The third resistor is connected in series with the sixth resistor, one end of the fourth resistor is connected to a connection end of the third resistor and the sixth resistor, One end of the sixth resistor is coupled to an input end of the potentiometer module.

10. A multi-channel audio amplification and isolation device, characterized in that: The multi-channel audio amplification isolation circuit comprises any one of claims 1 to 9, It is used to receive the audio signal output by the power amplifier module, and amplify and isolate the input audio signal, and output the processed audio signal through at least one output module for use by the subsequent stage.

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