2019 National Electronic Design Competition National Second Prize Code for Question D (Simple Circuit Characteristics Tester)

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2019 Electric Competition Question C National First Code (Line Load Is Fault Detection Device)

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2020 E-Contest Question E-Amplifier Nonlinear Distortion Research Device (Dalian University of Technology)

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2020 Electrical Contest Question E-Amplifier Nonlinear Distortion Research Device (Nanjing University)

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2021 Electronic Competition Question A (Signal Distortion Measurement Device) Provincial First Prize Code

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2021 Undergraduate Electronic Design Competition J Title National First Work (Periodic Signal Waveform Identification and Parameter Measurement Device)

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2021 College Student Electronic Design Competition Topic A Outstanding Works Collection (Signal Distortion Measurement Device)

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Open source USB2.0 high-speed analyzer

The analyzer host computer directly uses Wireshark. The hardware is implemented using Cypress CY7C68013A MCU + Lattice LCMXO2 FPGA + Microchip USB3343 USB PHY

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Open source current probe based on Rogowski coil

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W84219ASJ75_lighting detector

2-layer PCB 38.7 x 49.5 mm FR-4, 1.6 mm, 1, with wire spray tin, red solder mask, white silkscreen; lightning detector.

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10kHZ-255MHz signal generator OLED LCD

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0-30v 0-10A variable power supply with adjustable voltage and current

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120-channel logic analyzer based on Raspberry Pi Pico

The Raspberry Pi microcontroller 24-channel 100Msps logic analyzer has been upgraded to support 120 channels.
Daisy chaining of five devices is supported, allowing capture of 120 channels. Includes performance improvements and visibility improvements to the rendering engine, more samples in the screen, automatic selection of capture modes, editing capabilities, and more. The playability is getting higher and higher.

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Open source smart cooling plate design based on PIC16F17146

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Self-soldering PCB board design that supports reflow soldering (including PCB, schematic diagram, source code, etc.)

After the user manually solders a PCB board, this board becomes the reflow controller, and then this board can be used to control other boards for reflow soldering, because this board has been specially designed to open a heating layer.

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USB portable programmable instrument (multifunctional USB power supply)

The core idea of ​​USB portable programmable instruments is to provide electronic engineers and enthusiasts with a series of low-cost, portable, network-enabled, programmable, and open source practical tools. The multifunctional USB power supply is the first of its kind and is expected to complement traditional adjustable regulated power supplies.

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Agilent E3631A DC power supply schematic diagram

Several 51 chips were also used in the design.

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Open source handheld vector network analyzer NanoVNA

NanoVNA is a small handheld vector network analyzer with LCD display and battery-powered portable device. This project aims to provide a useful RF gadget.
The measurement frequency range is 50KHz - 300MHz, and there are many derivatives based on this design on the Internet.

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Rodeostat: Potentiometer for electrochemistry, fully open source

It's all open source, and their documentation is very detailed, which is a rare learning material.

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Reference design of Epson multimeter microcontroller S1C17M02/M03

Can measure DC/AC voltage, DC/AC current, resistance, inductance, capacitance, diode, frequency. Built-in 16bit ADC, digital filter, RMS effective value circuit and peak hold circuit. Multimeter control unit integrated with microcontroller, officially launched reference design kit, powered by button battery, including schematic diagram.

Schematic PCB