Simple, high-quality condenser microphone DIY for under $100

Schematic PCB

A low-profile version of full-featured software radio based on Raspberry Pi Pico (fully open source + detailed explanation)

With just a Raspberry Pi Pico, an analog switch and an op amp, you can build a powerful SDR receiver covering the LW, MW and SW bands. Capable of receiving signals from halfway around the world.

Schematic PCB

CISPR25 Class5 compliant 8-rail power tree reference design for automotive ADAS/infotainment applications

This is a single channel LiDAR demo board that allows you to check the operation of a high-speed optical front end using the LiDAR ToF range technology. The measurement distance can be up to 50m. The LiDAR ToF architecture can be applied in the automotive as well as consumer and industrial machinery sectors.

Schematic PCB

Totem-Pole Bidirectional Power Converter Reference Design for Electric Vehicles

This is a reference design for Totem-Pole bidirectional power converter for electric vehicles. By using SiC MOSFET, it can operate at high switching frequency, achieving high efficiency, small size and lightweight.

Schematic PCB

Open source 60W small UPS power supply reference design

Ideal for running network devices such as small switches, home routers, and WLAN access points.

Schematic PCB

HDMI to MIPI module, mobile phone screen into display (produced by Zhihuijun)

The quality of mobile phone screens is very high and the price is low. It is almost impossible to find mini displays made of mobile phone screens on the market, so this project is to solve this demand.

Schematic PCB

A tiny FIDO2 security key for two-factor authentication and passwordless login

Somu is a small FIDO2 security key that you can use with your Google, Twitter, and GitHub accounts for two-factor authentication, or with your Microsoft account for passwordless login.

Schematic PCB

Make a USB-C power supply (understand the principles of USB-PD in depth, including schematics and English design instructions, etc.)

A simple power supply design based on USB-PD, USB-PD allows to provide voltage up to 20V (current up to 5A), the author shared his design details, you can have an in-depth understanding of the working principle of USB-PD.

Schematic PCB

MCU-based face recognition solution

The MCU-based solution for Face Recognition is a turnkey hardware and single source software solution for adding machine vision to products using the i.MX RT line of crossover processors.

Schematic PCB

Magically modify your computer power supply to make a beautiful desktop power supply, simple and practical

You can certainly buy desktop power supplies, but they're not cheap. As the current capacity and output voltage quantity increase, so does the price. While a commercial desktop power supply is certainly worth the investment, you may want to consider a cheaper solution. Adapt an old computer power supply for use on your workbench. Computer power supplies have all the voltages you need and some very impressive current capabilities.

Schematic PCB

Open source power supply EEZ BB3: voltage support 0-80V, current 0-10A

Inspired by the EEZ H24005 programmable power supply project, which has attracted many enthusiasts with its feature set, rich user interface, DIY friendliness and completely open source hardware and software design.

Schematic PCB

Zhihuijun's new work: Hanwen smart keyboard with FOC force feedback knob, multi-function, modular mechanical keyboard (schematic, firmware, etc.)

The keyboard uses a modular design. The multi-functional scene interaction module on the left can be replaced with various custom components. By default, a Dynamic component with an e-ink screen and FOC force feedback knob is used; the keyboard body uses a shift register method to implement the key scanning circuit; The module and keyboard body can be used alone, or they can communicate and call each other through the serial port protocol.

Schematic PCB

200 W Game Console AC-DC Adapter GreenPoint® Reference Design

CN0276

High Performance, 10-Bit to 16-Bit Resolver-to-Digital Converter

Schematic PCB

Small UAV based on Espressif ESP32-S2/ESP32

ESP-Drone can be connected and controlled through Wi-Fi network using mobile APP or game controller. Currently, it supports multiple modes such as self-stabilizing flight, fixed-altitude flight, and fixed-point flight. This solution has a simple hardware structure, clear code structure, supports function expansion, and can be used in STEAM education and other fields.

Schematic PCB

Watchy - ESP32 ink screen watch with open source software and hardware

​Watchy is a completely open source and customizable e-ink screen watch. It uses ESP32-PICO-D4 as the core, has WiFi and Bluetooth LE connectivity, and is compatible with Arduino, MicroPython and ESP-IDF. The 200x200 pixel resolution e-paper display is clearly visible in bright sunlight and has ultra-low power consumption.

Schematic PCB

MCU-based local voice control solution

The i.MX RT with Built-in MCU-based solution for voice service is a turnkey hardware and single source software solution for adding voice control.

Schematic PCB

Novena: an open source computer based on Freescale and Xilinx FPGA, designed for use as a desktop, laptop or standalone board

Novena is a 1.2GHz, Freescale quad-core ARM architecture computer tightly coupled with Xilinx FPGA. It is designed for users who care about free software and open source, and/or want to modify and extend their hardware: all documentation for the PCB is open and freely downloadable, the entire operating system can be built from source, and it Comes with a variety of features that facilitate rapid prototyping.

Schematic PCB

NXH3670ADK development kit

NXH3670ADK development kit

Open Source Electromyography EMG Project

In the open source electromyography project shared here, the author used this product to create a computer game control effect.

Schematic PCB