Amplifier circuit for multipath voltage control

Abstract

The utility model relates to the technical field of voltage control, and discloses an amplifier circuit for multipath voltage control, which comprises chips U20, U25B, U21A, U21B, U23A and U23B, adjustable potentiometers R130 and R40, resistors R240, R257, R258, R239, R241, R256, R159, R243, R242, R255, R230, R229, R146, R279, R277, R276, R275, R278, R66, R55, R60, R382 and R273, polar capacitors C153, C152, C154, C157, C158, C159, C155, C156, C162, C195, C196 and C65, according to the application, stable signal amplification under accurate control of multiple paths of voltages is realized, high requirements of application scenes such as an internal communication system on signal processing are met, and the circuit performance is improved.

Description

Technical Field

[0001] This application relates to the field of voltage control technology, and in particular to an amplifier circuit for multi-channel voltage control. Background Technology

[0002] In modern electronic devices, multi-channel voltage-controlled amplifier circuits are widely used, playing a crucial role in fields such as interconnect systems. However, existing multi-channel voltage-controlled amplifier circuits have many problems.

[0003] On the one hand, the signal processing precision is low. When processing multiple input signals, it is difficult to ensure accurate amplification and control of signals from different channels, leading to distortion and deviation in the output signal, which seriously affects the overall performance of the system. For example, in an audio intercom system, this can cause problems such as poor sound quality and unstable volume.

[0004] On the other hand, the circuit's stability is insufficient. Existing circuits are greatly affected by external interference factors; power fluctuations, electromagnetic interference, etc., can cause voltage control fluctuations, thereby affecting the normal transmission and processing of signals. Moreover, existing circuits have low integration and scattered component layout, which not only increases the size and cost of the circuit but also reduces the system's reliability and anti-interference capability.

[0005] Therefore, there is an urgent need for a multi-channel voltage-controlled amplifier circuit that can improve signal processing accuracy, enhance circuit stability, and increase integration. Utility Model Content

[0006] The purpose of this application is to provide an amplifier circuit for multi-channel voltage control to solve the technical problems mentioned in the background art.

[0007] To achieve the above objectives, this application discloses the following technical solution: an amplifier circuit for multi-channel voltage control, comprising chips U20, U25B, U21A, U21B, U23A, U23B, adjustable potentiometers R130 and R40, resistors R240, R257, R258, R239, R241, R256, R159, R243, R242, R255, R230, R229, R146, R279, R277, R276, R275, R278, R66, and R55. Resistors R60, R382, R273, polarized capacitors C153, C152, C154, C157, C158, C159, C155, C156, C162, C195, C196, C65, C168, C167, C169, C170, C180, C151, C150, C250, C106, C101, C382, MOSFET Q29, diodes D46 and D47, green LED 0805, and socket J7;

[0008] Specifically, pin 2 of adjustable potentiometer R130 is connected to channel ESWD2; pin 1 of adjustable potentiometer R130 is connected to GNDA; pin 3 of adjustable potentiometer R130 is connected to the positive terminal of polarized capacitor C153; the negative terminal of polarized capacitor C152 is connected to pin 1 of resistor R240; pins 2 of resistor R240 and R257 are both connected to pin 7 of chip U20; pin 1 of resistor R257 is connected to pin 2 of capacitor C168; pins 1 of capacitor C168 and C167 are both connected to GNDA; pin 2 of capacitor C167 is connected to pin 1 of resistor R258; and pin 2 of resistor R258 is connected to pin 2 of chip U20. The positive terminal of capacitor C152 is connected to channel PGM; the negative terminal of polarized capacitor C152 is connected to pin 1 of resistor R23; pin 2 of resistor R23 is connected to pin 2 of chip U20; the positive terminal of polarized capacitor C152 is also connected to the positive terminal of polarized capacitor C154; the negative terminal of polarized capacitor C154 is connected to pin 1 of resistor R241; pin 2 of resistor R241 is connected to pin 10 of chip U20; pin 2 of resistor R241 is also connected to pin 1 of resistor R256; pin 2 of resistor R256 is connected to pin 1 of capacitor C169; pin 2 of capacitor C169 is connected to GNDA; the positive terminals of channel J1_A5, polarized capacitor C157, and polarized capacitor C158 are also connected to the positive terminals of the polarized capacitor C157 and C158. All terminals are connected to pin 6 of chip U20. The negative terminals of polarized capacitors C157 and C158 are grounded. The positive terminals of polarized capacitors C157 and C158 are also connected to pin 14 of chip U20. Pins 1 of resistor R159, pin 1 of capacitor C101, and pin 6 of chip U25B are all connected to channel CSWD1. Pin 5 of chip U25B is connected to GNDA. Pins 2 of resistor R159, pin 2 of capacitor C101, the positive terminals of polarized capacitors C159 and C155, and pin 7 of chip U25B are connected. The negative terminal of polarized capacitor C159 is connected to pin 1 of resistor R243. Pins 2 of resistor R243... The capacitor is connected to pin 7 of chip U20. The negative terminal of polarized capacitor C155 is connected to pin 1 of resistor R242. Pins 2 of resistor R242 and pin 1 of resistor R255 are connected to pin 15 of chip U20. Pin 2 of resistor R255 is connected to pin 1 of capacitor C170. Pin 2 of capacitor C170 is connected to GNDA. Pins 3 and 11 of chip U20, the positive terminal of polarized capacitor C156, and the positive terminal of polarized capacitor C162 are connected to pin 3 of adjustable potentiometer R40. The negative terminal of polarized capacitor C156 and the negative terminal of polarized capacitor C162 are grounded. Pin 1 of adjustable potentiometer R40 is connected to VDD_5V. Pin 2 of adjustable potentiometer R40 is connected to GNDA.

[0009] Among them, pin 9 of chip U20 is grounded; pin 16 of chip U20 is connected to VCC; pin 1 of chip U20 is connected to pin 1 of capacitor C180, and pin 2 of capacitor C180 is grounded; pin 8 of chip U20 is connected to GNDA; pins 12 and 13 of chip U20, pin 1 of resistor R230, pin 1 of capacitor C151, and pin 6 of chip U21B are connected; pin 5 of chip U21B is connected to GNDA; pins 2 of resistor R230, pin 2 of capacitor C151, and pin 7 of chip U21B are connected to channel ASWS3; pins 4 and 5 of chip U20, pin 1 of resistor R229, pin 1 of capacitor C150, and pin 2 of chip U21A are connected. Pin 3 of chip U21A is connected to GNDA; pin 4 of chip U21A is grounded; pin 8 of chip U21A is connected to VCC; pin 2 of resistor R229, pin 2 of capacitor C150, pin 1 of chip U21A, and pin 1 of capacitor C250 are connected; pin 2 of capacitor C250 is connected to pin 1 of resistor R146; pin 2 of resistor R146, pin 2 of resistor R279, pin 1 of MOSFET Q29, pin 1 of capacitor C106, and pin 2 of chip U23A are connected; pin 1 of resistor R279, pin 2 of resistor R277, and pin 2 of MOSFET Q29 are connected; pin 2 of capacitor C196 is connected to pin 1 of resistor R277; pin 2 of resistor R276, and pin 19... Pin 1 of chip 6 is connected to pin 3 of MOSFET Q29. Pins 1 of resistor R276, resistor R275, and capacitor C195 are connected to the positive terminal of green LED0805. Pin 2 of resistor R275 is connected to VCC, and pin 2 of capacitor C195 is grounded. The negative terminal of green LED0805 is connected to the positive terminal of diode D46. The negative terminal of diode D46 is connected to the positive terminal of diode D47. The negative terminal of diode D47 is connected to pin 2 of resistor R273. Pin 1 of resistor R273 is connected to channel S3_A. Pin 8 of chip U23A is connected to VCC, and pin 4 of chip U23A is grounded. Pin 3 of chip U23A and pin 1 of resistor R278 are connected to GN. Connect DA. Pin 2 of R278 and pin 1 of resistor R66 are both connected to pin 2 of MOSFET Q29. Pin 2 of resistor R66 is connected to pin 1 of chip U23A. Pin 1 of chip U23A, pin 2 of capacitor C106, pin 5 of chip U23B, and pin 1 of resistor R55 are connected to channel S3_B. Pin 6 of chip U23B, pin 1 of resistor R60, and pin 7 of chip U23B are connected. Pin 2 of resistor R55 and pin 2 of resistor R66 are connected to the positive terminal of polarized capacitor C65. The negative terminal of polarized capacitor C65 and pin 1 of resistor R382 are connected to pin 1 of socket J7. Pin 2 of resistor R382 is grounded. Pin 2 of socket J7 is left floating. Pin 3 of socket J7 is grounded.

[0010] Beneficial effects: The amplifier circuit for multi-channel voltage control in this application utilizes chips U20, U25B, U21A, U21B, U23A, and U23B, adjustable potentiometers R130 and R40, various resistors and capacitors, MOSFET Q29, diodes D46 and D47, green LED 0805, and socket J7, among other electrical components, to achieve precise control of multiple voltage channels and effective signal amplification. Through different processing paths for multiple input signals, such as ESWD2 and PGM signals, they are fed into the U20 chip via corresponding potentiometers and filtering circuits. This system enables separate adjustment and processing of multiple signals; the adjustable potentiometer R40, in conjunction with the power supply pin of the U20 chip, allows for flexible adjustment of the program signal level and precise voltage control; cascading and feedback amplification circuits between chips, such as the connection between U20 and U21A, U21B, and U23A, U23B, ensure stable signal amplification; multiple filter capacitors in the circuit effectively filter out noise and enhance circuit stability; ultimately, it achieves stable signal amplification under precise voltage control of multiple channels, meeting the high signal processing requirements of applications such as internal communication systems and improving circuit performance. Attached Figure Description

[0011] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0012] Figure 1 The circuit diagram of the amplifier circuit for multi-channel voltage control provided in the embodiments of this application is shown. Detailed Implementation

[0013] The technical solutions in the embodiments of this application will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0014] In this document, the term "comprising" is intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0015] This embodiment discloses, as follows: Figure 1 The amplifier circuit shown includes chips U20, U25B, U21A, U21B, U23A, U23B, adjustable potentiometers R130 and R40, resistors R240, R257, R258, R239, R241, R256, R159, R243, R242, R255, R230, R229, R146, R279, R277, R276, R275, R278, R66, R55, R60, and R... 382, Resistor R273, Polarized Capacitor C153, Polarized Capacitor C152, Polarized Capacitor C154, Polarized Capacitor C157, Polarized Capacitor C158, Polarized Capacitor C159, Polarized Capacitor C155, Polarized Capacitor C156, Polarized Capacitor C162, Polarized Capacitor C195, Polarized Capacitor C196, Polarized Capacitor C65, Capacitor C168, Capacitor C167, Capacitor C169, Capacitor C170, Capacitor C180, Capacitor C151, Capacitor C150, Capacitor C250, Capacitor C106, Capacitor C101, Capacitor C382, MOSFET Q29, Diode D46, Diode D47, Green LED 0805 and Socket J7.

[0016] Specifically, pin 2 of adjustable potentiometer R130 is connected to channel ESWD2; pin 1 of adjustable potentiometer R130 is connected to GNDA; pin 3 of adjustable potentiometer R130 is connected to the positive terminal of polarized capacitor C153; the negative terminal of polarized capacitor C152 is connected to pin 1 of resistor R240; pins 2 of resistor R240 and R257 are both connected to pin 7 of chip U20; pin 1 of resistor R257 is connected to pin 2 of capacitor C168; pins 1 of capacitor C168 and C167 are both connected to GNDA; pin 2 of capacitor C167 is connected to pin 1 of resistor R258; and pin 2 of resistor R258 is connected to pin 2 of chip U20. The positive terminal of capacitor C152 is connected to channel PGM; the negative terminal of polarized capacitor C152 is connected to pin 1 of resistor R23; pin 2 of resistor R23 is connected to pin 2 of chip U20; the positive terminal of polarized capacitor C152 is also connected to the positive terminal of polarized capacitor C154; the negative terminal of polarized capacitor C154 is connected to pin 1 of resistor R241; pin 2 of resistor R241 is connected to pin 10 of chip U20; pin 2 of resistor R241 is also connected to pin 1 of resistor R256; pin 2 of resistor R256 is connected to pin 1 of capacitor C169; pin 2 of capacitor C169 is connected to GNDA; the positive terminals of channel J1_A5, polarized capacitor C157, and polarized capacitor C158 are also connected to the positive terminals of the polarized capacitor C157 and C158. All terminals are connected to pin 6 of chip U20. The negative terminals of polarized capacitors C157 and C158 are grounded. The positive terminals of polarized capacitors C157 and C158 are also connected to pin 14 of chip U20. Pins 1 of resistor R159, pin 1 of capacitor C101, and pin 6 of chip U25B are all connected to channel CSWD1. Pin 5 of chip U25B is connected to GNDA. Pins 2 of resistor R159, pin 2 of capacitor C101, the positive terminals of polarized capacitors C159 and C155, and pin 7 of chip U25B are connected. The negative terminal of polarized capacitor C159 is connected to pin 1 of resistor R243. Pins 2 of resistor R243... The capacitor is connected to pin 7 of chip U20. The negative terminal of polarized capacitor C155 is connected to pin 1 of resistor R242. Pins 2 of resistor R242 and pin 1 of resistor R255 are connected to pin 15 of chip U20. Pin 2 of resistor R255 is connected to pin 1 of capacitor C170. Pin 2 of capacitor C170 is connected to GNDA. Pins 3 and 11 of chip U20, the positive terminal of polarized capacitor C156, and the positive terminal of polarized capacitor C162 are connected to pin 3 of adjustable potentiometer R40. The negative terminal of polarized capacitor C156 and the negative terminal of polarized capacitor C162 are grounded. Pin 1 of adjustable potentiometer R40 is connected to VDD_5V. Pin 2 of adjustable potentiometer R40 is connected to GNDA.

[0017] Among them, pin 9 of chip U20 is grounded; pin 16 of chip U20 is connected to VCC; pin 1 of chip U20 is connected to pin 1 of capacitor C180, and pin 2 of capacitor C180 is grounded; pin 8 of chip U20 is connected to GNDA; pins 12 and 13 of chip U20, pin 1 of resistor R230, pin 1 of capacitor C151, and pin 6 of chip U21B are connected; pin 5 of chip U21B is connected to GNDA; pins 2 of resistor R230, pin 2 of capacitor C151, and pin 7 of chip U21B are connected to channel ASWS3; pins 4 and 5 of chip U20, pin 1 of resistor R229, pin 1 of capacitor C150, and pin 2 of chip U21A are connected. Pin 3 of chip U21A is connected to GNDA; pin 4 of chip U21A is grounded; pin 8 of chip U21A is connected to VCC; pin 2 of resistor R229, pin 2 of capacitor C150, pin 1 of chip U21A, and pin 1 of capacitor C250 are connected; pin 2 of capacitor C250 is connected to pin 1 of resistor R146; pin 2 of resistor R146, pin 2 of resistor R279, pin 1 of MOSFET Q29, pin 1 of capacitor C106, and pin 2 of chip U23A are connected; pin 1 of resistor R279, pin 2 of resistor R277, and pin 2 of MOSFET Q29 are connected; pin 2 of capacitor C196 is connected to pin 1 of resistor R277; pin 2 of resistor R276, and pin 19... Pin 1 of chip 6 is connected to pin 3 of MOSFET Q29. Pins 1 of resistor R276, resistor R275, and capacitor C195 are connected to the positive terminal of green LED0805. Pin 2 of resistor R275 is connected to VCC, and pin 2 of capacitor C195 is grounded. The negative terminal of green LED0805 is connected to the positive terminal of diode D46. The negative terminal of diode D46 is connected to the positive terminal of diode D47. The negative terminal of diode D47 is connected to pin 2 of resistor R273. Pin 1 of resistor R273 is connected to channel S3_A. Pin 8 of chip U23A is connected to VCC, and pin 4 of chip U23A is grounded. Pin 3 of chip U23A and pin 1 of resistor R278 are connected to GN. Connect DA. Pin 2 of R278 and pin 1 of resistor R66 are both connected to pin 2 of MOSFET Q29. Pin 2 of resistor R66 is connected to pin 1 of chip U23A. Pin 1 of chip U23A, pin 2 of capacitor C106, pin 5 of chip U23B, and pin 1 of resistor R55 are connected to channel S3_B. Pin 6 of chip U23B, pin 1 of resistor R60, and pin 7 of chip U23B are connected. Pin 2 of resistor R55 and pin 2 of resistor R66 are connected to the positive terminal of polarized capacitor C65. The negative terminal of polarized capacitor C65 and pin 1 of resistor R382 are connected to pin 1 of socket J7. Pin 2 of resistor R382 is grounded. Pin 2 of socket J7 is left floating. Pin 3 of socket J7 is grounded.

[0018] In this specific application, based on the key aspects of input signal processing, voltage control and regulation, signal amplification and transmission, and power supply filtering and stabilization, the signal processing and voltage control functions are achieved through the coordinated work of multiple components. The working principle of this circuit is described below:

[0019] Input Signal Processing: Five input signals are processed differently before entering chip U20 (using SSM2164S). The ESWD2 signal is adjusted by potentiometer R130, then filtered by polarized capacitor C153, resistor R240, etc., before being input to the IN2 pin of chip U20, achieving initial adjustment of the signal amplitude. The PGM signal is split into two paths, filtered by polarized capacitor C152 and resistor R239 and polarized capacitor C154 and resistor R241 respectively, and then input to the IN1 and IN3 pins of chip U20, providing different control signals for the circuit. J1-A5 directly supplies power to the VC2 and VC4 pins of chip U20, ensuring the normal operation of some chip functions. The CSWD1 signal is first inverted by chip U25B, then filtered by resistor R159, capacitor C101, etc., and then input to the IN2 and IN4 pins of chip U20 in two paths, expanding the diversity of signal processing. The VDD+5V voltage is adjusted by the adjustable potentiometer R40 and filtered by polarized capacitors C162 and C156 before being input to the VC1 and VC3 pins of chip U20, providing a stable and adjustable power input for the chip.

[0020] Voltage Control and Regulation: Chip U20 is the core of voltage control, with its four power supply voltage inputs (VC1-VC4) working in conjunction with five input signals. By adjusting the voltage input to the VC pin, such as changing the output voltage after VDD+5V through the adjustable potentiometer R40, the signal strength can be altered, achieving precise voltage control of the overall circuit gain and ensuring accurate signal processing.

[0021] Signal Amplification and Transmission: The signal processed by chip U20 is output from the corresponding pins. Pins 12 and 13, and pins 4 and 5 are combined to output signals, which are then connected to chips U21B and U21A for inverting filtering and amplification, respectively. The output of chip U21A is coupled and filtered by C250 and R146 before being transmitted to chip U23B. Chip U23 (using LM833) further amplifies the signal. The signal amplified by chip U23B is coupled through resistor R60 and polarized capacitor C65 to socket J7 (headphone jack) to provide amplified signals for external devices; the other path is amplified by feedback and then enters chip U23A for further inverting amplification. Through multi-stage amplification and feedback mechanisms, the signal quality and strength are improved.

[0022] Stable power supply filtering: The circuit incorporates power supply filtering circuits at multiple critical locations. When J1-A5 is input to the VC2 and VC4 pins of chip U20, parallel polarized capacitors C157 and C158 are connected for power filtering. Before the VDD+5V input to the VC1 and VC3 pins of chip U20, parallel polarized capacitors C162 and C156 are connected for filtering, effectively removing noise and interference signals from the power supply, providing a stable power supply for each chip, and ensuring stable circuit operation.

[0023] In summary, the amplifier circuit for multi-channel voltage control in this embodiment utilizes chips U20, U25B, U21A, U21B, U23A, and U23B, adjustable potentiometers R130 and R40, various resistors and capacitors, MOSFET Q29, diodes D46 and D47, green LED 0805, and socket J7, among other electrical components, to achieve precise control of multiple voltage channels and effective signal amplification. Through different processing paths for multiple input signals, such as ESWD2 and PGM signals, signals are fed into chip U20 via corresponding potentiometers and filtering circuits. This system enables separate adjustment and processing of multiple signals; the adjustable potentiometer R40, in conjunction with the power supply pin of the U20 chip, allows for flexible adjustment of the program signal level and precise voltage control; cascading and feedback amplification circuits between chips, such as the connection between U20 and U21A, U21B, and U23A, U23B, ensure stable signal amplification; multiple filter capacitors in the circuit effectively filter out noise and enhance circuit stability; ultimately, it achieves stable signal amplification under precise voltage control of multiple channels, meeting the high signal processing requirements of applications such as internal communication systems and improving circuit performance.

[0024] Finally, it should be noted that the above description is only a preferred embodiment of this application and is not intended to limit this application. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. An amplifier circuit for multi-channel voltage control, characterized in that, Includes chips U20, U25B, U21A, U21B, U23A, U23B, adjustable potentiometer R130, adjustable potentiometer R40, resistors R240, R257, R258, R239, R241, R256, R159, R243, R242, R255, R230, R229, R146, R279, R277, R276, R275, R278, R66, R55, R60, R382, and R273. Polarized capacitors C153, C152, C154, C157, C158, C159, C155, C156, C162, C195, C196, C65, C168, C167, C169, C170, C180, C151, C150, C250, C106, C101, C382, MOSFET Q29, diode D46, diode D47, green LED 0805, and socket J7; Specifically, pin 2 of adjustable potentiometer R130 is connected to channel ESWD2; pin 1 of adjustable potentiometer R130 is connected to GNDA; pin 3 of adjustable potentiometer R130 is connected to the positive terminal of polarized capacitor C153; the negative terminal of polarized capacitor C152 is connected to pin 1 of resistor R240; pins 2 of resistor R240 and R257 are both connected to pin 7 of chip U20; pin 1 of resistor R257 is connected to pin 2 of capacitor C168; pins 1 of capacitor C168 and C167 are both connected to GNDA; pin 2 of capacitor C167 is connected to pin 1 of resistor R258; and pin 2 of resistor R258 is connected to pin 2 of chip U20. The positive terminal of capacitor C152 is connected to channel PGM; the negative terminal of polarized capacitor C152 is connected to pin 1 of resistor R23; pin 2 of resistor R23 is connected to pin 2 of chip U20; the positive terminal of polarized capacitor C152 is also connected to the positive terminal of polarized capacitor C154; the negative terminal of polarized capacitor C154 is connected to pin 1 of resistor R241; pin 2 of resistor R241 is connected to pin 10 of chip U20; pin 2 of resistor R241 is also connected to pin 1 of resistor R256; pin 2 of resistor R256 is connected to pin 1 of capacitor C169; pin 2 of capacitor C169 is connected to GNDA; the positive terminals of channel J1_A5, polarized capacitor C157, and polarized capacitor C158 are also connected to the positive terminals of the polarized capacitor C157 and C158. All terminals are connected to pin 6 of chip U20. The negative terminals of polarized capacitors C157 and C158 are grounded. The positive terminals of polarized capacitors C157 and C158 are also connected to pin 14 of chip U20. Pins 1 of resistor R159, pin 1 of capacitor C101, and pin 6 of chip U25B are all connected to channel CSWD1. Pin 5 of chip U25B is connected to GNDA. Pins 2 of resistor R159, pin 2 of capacitor C101, the positive terminals of polarized capacitors C159 and C155, and pin 7 of chip U25B are connected. The negative terminal of polarized capacitor C159 is connected to pin 1 of resistor R243. Pins 2 of resistor R243... The capacitor is connected to pin 7 of chip U20. The negative terminal of polarized capacitor C155 is connected to pin 1 of resistor R242. Pins 2 of resistor R242 and pin 1 of resistor R255 are connected to pin 15 of chip U20. Pin 2 of resistor R255 is connected to pin 1 of capacitor C170. Pin 2 of capacitor C170 is connected to GNDA. Pins 3 and 11 of chip U20, the positive terminal of polarized capacitor C156, and the positive terminal of polarized capacitor C162 are connected to pin 3 of adjustable potentiometer R40. The negative terminal of polarized capacitor C156 and the negative terminal of polarized capacitor C162 are grounded. Pin 1 of adjustable potentiometer R40 is connected to VDD_5V. Pin 2 of adjustable potentiometer R40 is connected to GNDA. Among them, pin 9 of chip U20 is grounded; pin 16 of chip U20 is connected to VCC; pin 1 of chip U20 is connected to pin 1 of capacitor C180, and pin 2 of capacitor C180 is grounded; pin 8 of chip U20 is connected to GNDA; pins 12 and 13 of chip U20, pin 1 of resistor R230, pin 1 of capacitor C151, and pin 6 of chip U21B are connected; pin 5 of chip U21B is connected to GNDA; pins 2 of resistor R230, pin 2 of capacitor C151, and pin 7 of chip U21B are connected to channel ASWS3; pins 4 and 5 of chip U20, pin 1 of resistor R229, pin 1 of capacitor C150, and pin 2 of chip U21A are connected. Pin 3 of chip U21A is connected to GNDA; pin 4 of chip U21A is grounded; pin 8 of chip U21A is connected to VCC; pin 2 of resistor R229, pin 2 of capacitor C150, pin 1 of chip U21A, and pin 1 of capacitor C250 are connected; pin 2 of capacitor C250 is connected to pin 1 of resistor R146; pin 2 of resistor R146, pin 2 of resistor R279, pin 1 of MOSFET Q29, pin 1 of capacitor C106, and pin 2 of chip U23A are connected; pin 1 of resistor R279, pin 2 of resistor R277, and pin 2 of MOSFET Q29 are connected; pin 2 of capacitor C196 is connected to pin 1 of resistor R277; pin 2 of resistor R276, and pin 19... Pin 1 of chip 6 is connected to pin 3 of MOSFET Q29. Pins 1 of resistor R276, resistor R275, and capacitor C195 are connected to the positive terminal of green LED0805. Pin 2 of resistor R275 is connected to VCC, and pin 2 of capacitor C195 is grounded. The negative terminal of green LED0805 is connected to the positive terminal of diode D46. The negative terminal of diode D46 is connected to the positive terminal of diode D47. The negative terminal of diode D47 is connected to pin 2 of resistor R273. Pin 1 of resistor R273 is connected to channel S3_A. Pin 8 of chip U23A is connected to VCC, and pin 4 of chip U23A is grounded. Pin 3 of chip U23A and pin 1 of resistor R278 are connected to GN. Connect DA. Pin 2 of R278 and pin 1 of resistor R66 are both connected to pin 2 of MOSFET Q29. Pin 2 of resistor R66 is connected to pin 1 of chip U23A. Pin 1 of chip U23A, pin 2 of capacitor C106, pin 5 of chip U23B, and pin 1 of resistor R55 are connected to channel S3_B. Pin 6 of chip U23B, pin 1 of resistor R60, and pin 7 of chip U23B are connected. Pin 2 of resistor R55 and pin 2 of resistor R66 are connected to the positive terminal of polarized capacitor C65. The negative terminal of polarized capacitor C65 and pin 1 of resistor R382 are connected to pin 1 of socket J7. Pin 2 of resistor R382 is grounded. Pin 2 of socket J7 is left floating. Pin 3 of socket J7 is grounded.

Images