2018 Electronic Competition Question A-Current Signal Detection Device (Sichuan University of Electronic Science and Technology)

Schematic PCB

HEGduino V2: Cerebral blood map monitoring

Since the release of HEGduino V1, we have been working continuously for more than a year and a half to develop a compact, state-of-the-art open hardware solution for home NIR-HEG biofeedback. HEGduino V2 is an original design that brings you low-cost, intuitive home brain training and research-grade cerebral blood flow monitoring. This new device also allows us to incorporate heart rate variability (HRV) training and even monitor breathing and skin temperature. HEGduino V2 is comfortable. Easy-to-use headset with wireless operation and battery power. These components are breakout boards that allow you to remove them from the headset for easy patching or replacement.

Schematic PCB

2017 National College Student Electronic Design Competition Question H-Remote Amplitude and Frequency Characteristics Tester-Paper

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2018 Electronic Competition Question A-Current Signal Detection Device (Qingdao University of Technology)

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Open source smart cooling plate design based on PIC16F17146

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CPLD portable digital storage oscilloscope hardware platform design

CPLD portable digital storage oscilloscope hardware platform design

Schematic PCB

Single chip digital voltmeter design

Learning about microcontrollers is a small example of microcontroller design that is very suitable for beginners and should not be missed.

Schematic PCB

Storage oscilloscope, fully functional and verified, for graduation project

Storage oscilloscope, fully functional and verified, for graduation project

Schematic PCB

AC Ohmmeter mR-71 Remake

Schematic PCB

Hamster Mix: Portable open source Bluetooth MIDI controller with Arduino and ESP32 (schematics, source code, etc.)

Hamster Mix is ​​a portable MIDI controller powered by Arduino that connects to MIDI via Bluetooth. It allows you to control effects and play MIDI notes in 5 octaves. Twelve keys and the ability to switch up and down through the octave make it easy to control the notes of an entire keyboard piano using our compact controller (about the size of a hamster). Hamster Mix connects to Mac, PC, Ipad and even mobile phones via Bluetooth. You can control any MIDI-enabled music program such as Ableton, Garage Band, FL Studio, Reaper, etc. Two additional buttons and two potentiometers allow you to set up your own custom effects. You can even use the buttons as a Bluetooth track launcher instead of a keyboard. You can control MIDI-enabled mobile applications such as GarageBand, FL Studio Mobile, Reason Compact, Audiokit Synth One, Moog applications, and more. Make music on the go with Hamster Mix, which fits in your pocket, meaning no wires or bulky equipment.

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Reverse Engineering and Repair of LeCroy High Frequency Active Probe HFP2500

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2018 Electronic Competition Question A-Current Signal Detection Device (Xidian University)

Schematic PCB

Digital voltmeter based on microcontroller (circuit diagram)

Digital voltmeter based on microcontroller (circuit diagram)

Schematic PCB

PlainDAQ: Simple open source DAQ module for Raspberry Pi Pico (schematic, source code, etc.)

PlainDAQ is a simple, useful tool that adds basic precision analog functionality to your Raspberry Pi Pico board. It features a precision, low noise, low drift 12-bit 500k sps/s ADC. To match the ADC and maintain its noise and accuracy, all analog inputs are buffered and the ADC is driven by a high speed/low noise fully differential amplifier. It also has a 10-bit DAC that helps create analog outputs and waveforms.

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Ultrasonic ranging based on stm32

Ranging through the ultrasonic module, stm32 is transmitted to OLED through IIC protocol

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A DC regulated power supply circuit diagram based on 89C51

A DC regulated power supply circuit diagram based on 89C51, a novel regulated power supply design solution

Schematic PCB

Agilent power supply schematic diagram

The complete circuit diagram can be used directly for circuit design reference. Simple CNC DC power supply, core power circuit part. Including AC and DC input parts, the pre-voltage regulation part is helpful for dispersing the heat of power devices; input and output protection, startup delay, communication functions; voltage control, current control, overvoltage and overcurrent protection;

Schematic PCB

10kHZ-255MHz signal generator OLED LCD

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Digital ammeter production + schematic diagram + program

Digital ammeter production + schematic diagram + program

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2019 Electronic Competition Question C-Circuit Load and Fault Detection Device-Design Report (National Secondary School, Southeast University)

Schematic PCB