PCB ruler

Introduction: It’s just a PCB ruler with nothing to say about it.

Schematic PCB

ESP32 electronic load meter 2.0

Introduction: CNC display constant current adjustable load meter based on ESP32, small size and high power, with rich expansion interfaces

Schematic PCB

ATtiny85 spot welding machine

Introduction: Version 3.0 of the ATtiny85 lithium battery nickel sheet spot welding machine is based on the Arduino IDE development software. The early works were too scumbag and lightly sprayed.

Schematic PCB

Low voltage 6-stage electromagnetic accelerator

Introduction: A low-voltage MOS switchable continuous electromagnetic accelerator uses a 6-level acceleration module and is detected and controlled by a grooved photoelectric switch to achieve acceleration and anti-reverse pull. The power supply is composed of a large number of ordinary capacitors connected in parallel + farad capacitors + power batteries. Used to achieve high power output, multiple modules can be used in cascade

Schematic PCB

Arduino speedometer

Introduction: A mini speedometer solution

Schematic PCB

936 soldering iron temperature control board

Introduction: ATTINY85 control soldering iron

Schematic PCB

Arduino 936 soldering iron

Introduction: Multifunctional 936 soldering iron driver board that supports type-C fast charging and DC5.0 interface, with voltage and current measurement, temperature measurement display, automatic detection and switching of thermal resistance and thermocouple working modes

Schematic PCB

fpga+eth+ad

Introduction: After FPGA samples through AD7606, DP83848PHY sends the data packet through Ethernet, which can also be displayed on the screen through VGA.

Schematic PCB

[Guangdong University of Technology] Simple transistor amplifier

Introduction: A distortion waveform research device based on a simple triode amplifier based on stm32f103rct6 microcontroller, which can measure output impedance, amplification, total harmonic distortion, etc.

Schematic PCB

Physical health monitoring

Introduction: Use Max30100 and Max30205 to monitor human blood oxygen saturation and body temperature

Schematic PCB

AS5600 magnetic encoder base plate

Introduction: Simple AS5600 base plate, can be used with 2804 brushless motor

Schematic PCB

Transistor tester patch expansion version

Introduction: A transistor tester expansion board is connected to 2*3 patch pin headers and Dupont wire is connected to the IC locking socket to complete the measurement of patch components.

Schematic PCB

Home air quality monitor based on ESP8266

Introduction: This design is a low-power, real-time, high-stability, multi-functional and convenient home air quality monitor based on ESP8266. It aims to conduct indoor data collection, data analysis and data display for the factors that have the greatest impact on the human body, such as formaldehyde, dust, temperature and humidity.

Schematic PCB

Warehouse safety management system

Introduction: This is a management system based on warehouse security

Schematic PCB

Constant current dummy load based on STM8L052C6

Introduction: This project is a hardware design solution for constant current dummy load. It uses STM8L052C6 microcontroller as the main control, USB power supply, has voltage and current detection capabilities, and uses a thermistor to detect the temperature of the MOS tube to prevent overheating and burning. This project has not yet completed hardware testing and software writing.

Schematic PCB

Low noise power supply for handheld instruments

Introduction: Low-noise power module suitable for handheld instruments, input 3.3~5.5V, output +/-10V, 1000mA and +/-9V, 150mA (low noise) or +/-6V, 1000mA and +/-5V, 150mA (low noise).

Schematic PCB

double peak detector

Introduction: Double peak detection circuit implemented using LM311, with a bandwidth of 200kHz.

Schematic PCB

[Nanjing Post and Telecommunications School Competition] Lock-in Amplifier

Introduction: This work is based on the design of lock-in amplifier. In the pre-amplification circuit, the signal is first sent to the AC amplifier through the voltage divider network. The signal passes through the band-pass filter, plus the square wave obtained from the reference channel, and is input into the phase-sensitive detection circuit together to obtain the rectified waveform. After passing through the low-pass filter, the DC signal is obtained, which is displayed on the screen.

Schematic PCB

CB_CMSIS_DAP

Introduction: CMSIS_DAP https://gitee.com/cazure/CMSIS-DAP

Schematic PCB

Alcohol gas detector

Introduction: alcohol detector

Schematic PCB