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.
Power
PhysicsDptAngers
76.6 × 96.6 mm3 parts2LMIT87
Mynd Batt
teufelaudio
41 × 21 mm14 parts2LCC-BY-SA-4.076
AVR/ArduinoEnv
bread-modular
30.5 × 68.6 mm29 parts2LMIT65
Hps04
gzweigle
38.1 × 10.2 mm4 parts2LGPL-3.060
2020-offset-4x
jkominek
45.5 × 45.3 mm5 parts2LCustom license53
Eurorack Wavefolder Module
Len42
47.7 × 83 mm59 parts2LNo license50
Ltc2990 sensor
libresmartphone
12.7 × 13.5 mm13 parts2LNo license33
CVMod8 V2 Main THT
Thorinair
100.8 × 85 mm63 parts2LCC-BY-SA-4.025
Vm107-mixmaster
mirdej
58 × 47.5 mm42 parts2LNo license23
ESP32ESP32 MIDI v3a
collaborative-music-lab
171 × 28 mm17 parts2LNo license19
MiSTeryNano MIDI Shield
MiSTle-Dev
57 × 57 mm32 parts2LNo license17
AVR/ArduinoQuantizer
telec16
25 × 200 mm38 parts2LNo license16
Fatdrive
bubbajfett
59.1 × 46.9 mm46 parts2LCC0-1.014
4Channe Mixer
mort13
49.5 × 98 mm39 parts2LGPL-3.012
AddBuff jackV2
banjomasterpete
30 × 105 mm19 parts2LNo license12
2164 SVF plug in board
JordanAceto
58.4 × 50.8 mm52 parts2LCC-BY-4.011
Layout
powsplatboom
139.7 × 78.7 mm19 parts2LNo license11
Power Distribution THT
BruteClaw
210 × 80 mm31 parts2LGPL-3.010- schematic only · 175 parts
Building blocks
lennartquerter
175 parts2LCC-BY-NC-4.010 
Util lfo stripboard
VincentPeters
27.9 × 47 mm21 parts2LNo license9
Adapter 1U27HP3uCv2
MostlyCoraGrace
19.2 × 133.4 mm6 parts2LMIT6
Yaesu-RJ45
open-headset-interconnect-standard
27.3 × 30.5 mm3 parts2LCC-BY-4.05
STM32Five Pulser
39.4 × 78.7 mm47 parts2LCC-BY-4.02
POWER
PancakeLegend
30 × 100 mm20 parts4LGPL-3.02
Eurorack
Alloyed
80.8 × 110 mm14 parts2LMIT2
Rimjob
velvia-fifty
100 × 100 mm22 parts2LCC-BY-NC-4.01
Wave Form Amplifier
mwwhited
97.5 × 47.5 mm22 parts2LMIT1
Dc isolator
adeboni
33.2 × 24.5 mm8 parts2LGPL-3.01
6V3 AC Distribution
FordPrfkt
80 × 25 mm5 parts2LNo license1
RISC-VDAC HPA 120x100 CLOCK ESCAPE STUDY ONLY
ooyang0325
120 × 100 mm470 parts4LNo license0
NXPQuad Preamp and 4-Channel Ambisonic Recorder
jdg511
138 × 114 mm180 parts4LNo license0
RP2040/RP2350Handbell 0.2 - UNROUTED PLACEMENT ONLY
dcuccia
43 × 43 mm75 parts2LMIT0
Backup r1
blthree
99.4 × 78 mm62 parts2LNo license0
BACKPLANE A
Desval27
428.6 × 130.2 mm49 parts2LMIT0
STM32Test zero perfect
akularya6-del
15 × 31 mm38 parts4LNo license0
Kompari
rhinocerose
28.5 × 100 mm34 parts2LNo license0
Browse boards by part
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