This circuit is a multi-channel adder/subtractor circuit using the OPA690 op-amp.
The pads SB1-5 can be shorted to select additional lines and switch between adder and subtractor functions (described in the schematic and PCB diagrams).
The input terminals can be selected for RF/DC components to achieve different functions.
Gain adjustment and impedance matching can be achieved by changing the resistance of the RP1 sliding rheostat.
I used this module in the 2024 National Electronic Design Contest.
![Screenshot 2024-09-02 180827.png]
The software used Arduino to program
the hardware, but due to a lack of careful reading of the ESP32 datasheet, the buzzer did not function properly.
The buzzer was connected incorrectly to the ESP32's I/O port, being connected to an input port, preventing it from outputting a signal and producing sound.
This course introduces a digital voltmeter and
ammeter based on the LCSC development board, Diwenxing.
Learning to design and build a digital voltmeter and ammeter is highly beneficial for improving personal professional skills. The digital voltmeter and ammeter project covers multiple aspects, including microcontroller circuit design and implementation, signal acquisition and processing circuit design, user interface development and optimization, and product appearance design. It integrates knowledge from multiple fields such as electronics, microcontroller programming, circuit design, and industrial design.
Hardware Selection
:
Since this training camp is sponsored and technically supported by CW32 and JLCSC, the LCSC Diwenxing CW32F030C8T6 is chosen as the main controller. Project Highlights:
Wide
Voltage Range:
Due to the powerful GPIO drive capability of the CW32, transistors are not used to drive
the digital transistors
This project uses an LDO as the power supply. Considering that most voltmeter products are used in industrial scenarios with 24V or 36V power supplies, the SE8550K2 with a maximum input voltage of up to 40V is chosen as the LDO chip to replace the 8705.
The classic TL431 is used to obtain a 2.5V reference voltage.
WeChat_20240902193545.mp4
PDF_CW32 Voltage and Current Meter.zip
Altium_CW32 voltage and current meter.zip
PADS_CW32 Voltage and Current Meter.zip
BOM_CW32 Voltage and Current Meter.xlsx
92498
STM32F103C8T6 Minimum System Board
I designed the board a few months ago; it's an STM32F103C8T6 minimum system board, and it works fine in actual testing.
Introduction:
1. Download and debugging only support SolidWorks (SW) mode.
2. All usable I/O ports are exposed.
3. One 5V, three 3.3V, and five GND pins are exposed, solving the problem of insufficient GND during use.
Precautions:
1. The currently used 49SMD oscillator is prone to cold solder joints; caution is advised. You can replace it with a through-hole or 3215 package crystal oscillator.
2. Please confirm the required load capacitance of your crystal oscillator component.
Board Front:
Board Back:
video.mp4
PDF_stm32f103c8t6 Minimum System Board.zip
Altium_stm32f103c8t6 minimum system board.zip
PADS_stm32f103c8t6 Minimum System Board.zip
BOM_stm32f103c8t6 Minimum System Board.xlsx
92499
Interface isolation board for UltraLink
An interface isolation board for UltraLink with a power output switch. Tested and can stably run at 10Mbps.
This is an interface isolation board only for UltraLink, and testing has shown it can stably reach 10Mbps. Similar designs can also be used as a reference.
The isolation board only exposes 5V, 3V3, TX, RX, SWDIO, SWCLK, and GND interfaces. The output interfaces use standard ST-TAG interfaces and custom 6-pin sockets (to reduce size).
The isolation chip is the CA-IS3762HN (4 transmit, 2 receive) from Chuantu Microelectronics, and the isolation power supply is the B0503XT-2WR3 from Mornsun. UltraLink provides a separate 3V3 output to power the CA-IS3762HN and a separate 5V output to power the B0503XT-2WR3. The B0503XT-2WR3 has a maximum output current of 600mA and can power the target board. When the target board has an independent power supply, the output can be cut off via a sliding switch.
The attached file is the original AD project.
![a7cfe0f8e47b7aa5e1b3cce03054173.jpg]
MOD_DAP-LINK Interface Isolation Board_H001A.zip
PDF_Interface Isolation Board for UltraLink.zip
Altium Interface Isolation Board for UltraLink.zip
PADS_Interface Isolation Board for UltraLink.zip
BOM_Interface Isolation Board for UltraLink.xlsx
92501
One-to-six power supply boards
One-to-six power distribution board, with signal splitters and terminating resistors.
Project Overview:
This project is a 1-to-6 power distribution board with terminating resistors.
Its functions
include power and signal distribution for robots.
The project
uses a GH1.25*2P connector as the CAN interface and does not require a common ground.
PDF_One-to-Six-Split Circuit Board.zip
Altium 1-to-6 power supply board.zip
PADS_One-to-Six-Split Circuit Board.zip
BOM_One-to-Six-Split Circuit Board.xlsx
92502
electronic
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