2,590 open source boards in Audio
Amplifiers, DACs, synthesizers, Eurorack modules, MIDI and guitar pedals. Every board here is a public GitHub project with its KiCad files, read for size, layers and parts. Pick one close to your design and simulate its firmware on HardLabs before you build it.
MusicBrain GATEIN8 - 8x gate in slot card
MarkWestbroek
50 × 45 mm32 parts2LMIT0
ESP826610 modular midi 2 cv
bmurauer
24 × 134.1 mm29 parts2LNo license0
AVR/ArduinoRoaster
eblade
87.4 × 66.8 mm26 parts2LNo license0
Trackpad IQS9150
cetola
105.5 × 53.3 mm10 parts2LNo license0
Output
Fora888
7.6 × 1.4 mm5 parts2LMIT0- schematic only · 4 parts
Bus enable
carr-james
4 parts2LNo license0 
Multiplexer
ohmtech-rdi
22 × 19 mm5 parts2LCC-BY-SA-4.0405
Pe42520 breakout
loxodes
31.3 × 23.5 mm19 parts4LNo license206
Envelope Follower Main
mzuelch
31.8 × 101.6 mm31 parts2LMIT165
Zynface V5
zynthian
51.3 × 105 mm22 parts2LNo license154
RP2040/RP2350Rowan
tpcarlson
60 × 39.6 mm93 parts2LNo license106
AVR/ArduinoMcc
bread-modular
30.5 × 68.6 mm22 parts2LMIT65
Hps08
gzweigle
38.1 × 10.2 mm4 parts2LGPL-3.060
2040-centered-4x
jkominek
45.5 × 48 mm5 parts2LCustom license53
Eurorack Audiout Module
Len42
40.6 × 96.1 mm58 parts2LNo license50
Zerophone audio buffer
libresmartphone
13.2 × 10.7 mm5 parts2LNo license33
KickAid Front
Thorinair
39.8 × 108.6 mm25 parts2LCC-BY-SA-4.025
Vm102-inputs
mirdej
28 × 53 mm15 parts2LNo license23
DC12v
collaborative-music-lab
35.6 × 34.2 mm16 parts2LNo license19
Glider
telec16
25 × 200 mm29 parts2LNo license16
Umble
bubbajfett
58.1 × 50.3 mm44 parts2LCC0-1.014
Split mult
mort13
23 × 100 mm23 parts2LGPL-3.012
Mutron III plug in board
JordanAceto
58.4 × 50.8 mm51 parts2LCC-BY-4.011
Distribution Board
powsplatboom
200 × 35 mm15 parts2LNo license11
Notch Filter THT
BruteClaw
30 × 100 mm29 parts2LGPL-3.010
Adapter 2U27HP3uCv2
MostlyCoraGrace
19.2 × 133.4 mm6 parts2LMIT6
STM32CEM3320 LPF plug in board
58.4 × 50.8 mm42 parts2LCC-BY-4.02
Audio Amplifier
synthesissolutions
27.9 × 44.5 mm31 parts4LNo license2
AVR/ArduinoMIDI to CV
PancakeLegend
30 × 100 mm18 parts2LGPL-3.02
IO-Midi-SN76489
Trilobyte-CPU
93.5 × 33.8 mm17 parts2LNo license2
THX-4046
velvia-fifty
100 × 100 mm22 parts2LCC-BY-NC-4.01
Mini 12v pwr
adeboni
26.4 × 23.3 mm8 parts2LGPL-3.01
RISC-VDAC HPA 120x100 MACRO STUDY ONLY
ooyang0325
120 × 100 mm470 parts4LNo license0
NXPQuad Preamp and 4-Channel Ambisonic Recorder
jdg511
138 × 114 mm180 parts2LNo license0
Lfo
blthree
39.6 × 99.1 mm52 parts2LNo license0
ENVELOPE FOLLOWER
Desval27
160 × 100 mm40 parts2LMIT0
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AMS1117-3.3 1287USBLC6-2SC6 1056RP2040 725W25Q128JVS 444AP2112K-3.3 408TL072 347ESP32-S3-WROOM-1 324TL074 308CH340C 290L7805 29074HC595 267USBLC6-2P6 260Pico 258LM358 237AP2112K-3.3TRG1 22474LS04 207ESP32-WROOM-32 203Arduino_Nano_v3.x 202LM7805_TO220 20174LS245 18474LS138 176SRV05-4 17674LS08 17574LS32 175