⏚ Electronics

Adafruit MAX98357 I2S Class-D amplifier breakout

EagleCAD schematic and board files for the MAX98357A mono I2S 3W amp breakout and the stereo rev B version.

ECC83 tube preamplifier (KiCad demo project)

KiCad demo project for a single-stage ECC83/12AX7 valve preamp, including schematic, PCB and 3D model.

Mutable Instruments Eurorack modules (hardware designs)

EagleCAD schematics and PCB layouts for Mutable Instruments' open-source Eurorack synth modules (Braids, Clouds, Plaits, Rings, Peaks, Tides, Warps and more).

Large repo (mostly firmware); hardware lives in each module's hardware_design/pcb folder. Don't use the Mutable Instruments name on derivatives.

Adafruit QT Py (SAMD21) dev board PCB

EagleCAD schematic and board files plus pinout PDF for Adafruit's tiny SAMD21 QT Py dev board with STEMMA QT connector.

Arduino UNO Rev3 reference design (Eagle)

Official Arduino UNO R3 EagleCAD schematic and board files and schematic PDF.

Olimex ESP32-C3-DevKit-Lipo (KiCad)

Complete KiCad project (schematic, PCB, 3D packages) for Olimex's open-hardware ESP32-C3 dev board with LiPo charger.

Repo is about 80 MB and bundles third-party datasheets, so we link out.

Raspberry Pi Pico design files

Official Raspberry Pi Pico R3 public design files: schematic PDF, Cadence Allegro board and design files, and BOM.

Board files are Cadence Allegro, not KiCad.

SparkFun RedBoard (Arduino-compatible) hardware files

EagleCAD schematic and board, production panel and schematic PDF for SparkFun's ATmega328P Arduino-compatible RedBoard.

SparkFun Thing Plus RP2040 hardware files

EagleCAD design, schematic PDF and full Gerber production set for SparkFun's RP2040 Thing Plus (Feather form factor) board.

Schematic hosted here; full Eagle and Gerber set at the source.

Adafruit Perma-Proto HAT for Raspberry Pi

EagleCAD design for the Raspberry Pi HAT-format perma-proto prototyping board, with and without EEPROM.

MintyBoost USB charger kit (v2 and v3)

The classic Altoids-tin 2xAA to 5V USB charger; EagleCAD schematic and board for versions 2 and 3.

Adafruit PowerBoost 1000 Basic (5V boost converter) PCB

EagleCAD schematic and board for Adafruit's TPS61030-based 1A 5V boost converter for LiPo and battery projects.

Adafruit BME280 temperature, humidity and pressure breakout PCB

EagleCAD schematic and board for Adafruit's BME280 I2C/SPI environmental sensor breakout.

Adafruit MPU-6050 6-DoF accelerometer and gyro breakout PCB

EagleCAD schematic and board for the Adafruit MPU-6050 STEMMA QT breakout.

SparkFun BME280 Atmospheric Sensor Breakout

EagleCAD design, production panel, Fritzing part and wiring examples for SparkFun's BME280 breakout.

Repo bundles third-party datasheets, so we link out.

Adafruit USB Power Gauge mini-kit PCB

EagleCAD design for an inline USB voltage and current gauge with LED bargraph and serial output; a handy bench tool.

PIC programmer (KiCad demo project)

KiCad demo project for a serial PIC microcontroller programmer board with ZIF socket; schematic, PCB and footprint libraries.

SparkFun Bi-Directional Logic Level Converter

EagleCAD design and production panels for the 4-channel BSS138 3.3V/5V logic level shifter breakout.

SparkFun Pocket AVR Programmer

USBtiny-based AVR ISP programmer: EagleCAD hardware, production panels and GPL firmware.