REFERENCE DESIGNS

Open hardware, with the files to prove it.

362 published boards whose schematic and layout source is public — KiCad, EAGLE, Altium and EasyEDA projects you can read, fork and build on. Every entry links to the original repository and names its licence.

Boards indexed

362

With a design page

362

KiCad projects

163

Haxo hw

by cardonabits

Haxophone, an electronic musical instrument that resembles a saxophone

672 20Custom

Audio & music

SqueezeAMP

by philippe44

all-in-one audio board, works specially well with LogitechMediaServer

282 21Custom

Eurorack Pcbs board, published by nickajeglin

KiCad source

Audio & music

Eurorack Pcbs

by nickajeglin

A collection of easy to solder DIY eurorack PCB's

207 14No license

KiCad source

Audio & music

Pico Dco

by polykit

Polyphonic Digitally Controlled Oscillator (DCO) controlled by Raspberry Pi Pico PIO

161 16No license

pc Kharon 386 board, published by UzixLS

KiCad source

Audio & music

pc Kharon 386

by UzixLS

Tiny IBM PC compatible machine with 386 CPU, integrated VGA and sound.

109 14CC-BY-SA-4.0

Printable Instruments board, published by 30350n

KiCad source

Audio & music

Printable Instruments

by 30350n

PCB panels for Mutable Instruments eurorack modules

75 14Custom

zx Multisound board, published by UzixLS

KiCad source

Audio & music

zx Multisound

by UzixLS

ZX Spectrum soundcard for NEMOBUS/ZXBUS

37 19MIT

Audio & music

OPL2LPT Replica

by zjuyzj

A re-designed, simplified version of OPL2LPT Adlib-Compatible sound card working on printer port.

32 7MIT

Led Shelf Controller board, published by AShadyPCB

Altium source

Audio & music

Led Shelf Controller

by AShadyPCB

Silent 25 kHz H-bridge replacement for a whining 24V tunable white/orange LED shelf controller. STM32 + BLE, reverse engineered from the original, with scope and audio FFT documentation.

17 1MIT

MIDI4MiSTer board, published by KabukiFlux

KiCad source

Audio & music

MIDI4MiSTer

by KabukiFlux

MiSTer user port MIDI output and input PCB

13 0MIT

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Microcontroller boards73 Keyboards & input devices54 Computers & FPGA30 Retro computing30 Displays & LED23 Audio & music22 Sensors & data acquisition21 Motor control & robotics21 Power & batteries20 RF & wireless20 Interfaces & adapters16 Other boards14 IoT & home automation6 Test & measurement5 Badges & art boards5 Automotive & vehicles1 Cameras & imaging1

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Repository topics

Every project listed here belongs to its author and is linked to its original repository. Licences are read from the repository metadata and summarised for convenience — check the licence file in the project itself before you manufacture or redistribute a design. ProtoFlow does not host, mirror or verify these files. Index last rebuilt 2026-09-21.

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