122 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.
FPGAHaasoscopePro
drandyhaas
224.5 × 160 mm586 parts10LMIT471
ESP32Patternflow
engmung
62 × 116.3 mm9 parts2LCustom license338- schematic only · 3 parts
Circuit synth
circuit-synth
3 partsMIT276 
VCO
nickajeglin
37 × 113.9 mm104 parts2LNo license207
Vna mm synth
loxodes
314.5 × 201 mm428 parts6LNo license206
STM32Module17
M17-Project
100 × 83 mm186 parts4LCERN-OHL-W-2.0129
Core
shmoergh
215 × 100 mm285 parts2LNo license123
USBSID-Pico
LouDnl
92.8 × 71.8 mm83 parts2LGPL-2.0117
AVR/ArduinoScout
oskitone
145.3 × 44.5 mm38 parts2LCustom license114
STM32PER|FORMER eurorack sequencer
westlicht
171.5 × 106.7 mm304 parts2LCC-BY-NC-4.0109
Design os-3d blender
jangtrinh
54 × 46 mm20 parts2LMIT81
FPGAZynqPCB
juliancoy
120 × 60 mm295 partsMIT74
ESP32TRS-IO++
apuder
145.7 × 107.8 mm94 parts2LGPL-3.074
4mix
bread-modular
91.4 × 68.6 mm167 parts4LMIT65
AES50
YetAnotherElectronicsChannel
99 × 55 mm201 parts4LGPL-3.064
AVR/ArduinoArduino NMR 5.4
SoukeyCircuits
90 × 79 mm126 parts4LGPL-3.052
Eurorack 4XVCA Module
Len42
50.5 × 108.2 mm108 parts2LNo license50
STM32Oscar components
dchwebb
71 × 100 mm63 parts4LUnlicense38
RP2040/RP2350MMM main
niektb
40 × 110 mm145 parts4LCC-BY-SA-4.034
NXPRawWaves
SherpaModular
20 × 107 mm55 parts2LNo license26
Fuzzpedal
alberand
60 × 112.1 mm56 parts2LNo license25
ESP32AiO-i2s-DAC
martinroger
58.8 × 55.8 mm86 parts2LMIT22
Raspberry PiEavesDrum
tobigun
100 × 100 mm94 parts2LGPL-3.021
Qn8035-rpi fm radio
dilshan
58 × 26.8 mm25 parts2LMIT21
FreeDSP-OCTAVIA
freeDSP
178 × 99 mm505 parts4LCC-BY-SA-4.019
CoreOne xCORE200-Original
ohdsp
100 × 100 mm389 parts4LNo license19
Toern
Soundpauli
160 × 71 mm118 parts4LCC-BY-NC-4.019
DAC-ADAU1966
100 × 100 mm306 parts4LTAPR-OHL-1.015
Sisu SSE-9
briskspirit
43.9 × 118.2 mm259 parts6LUnlicense15
Ardor
balazsbencs
37 × 20.5 mm20 parts2LMIT12
Panning Mixer
powsplatboom
243.8 × 100 mm633 parts4LNo license11
OSVA
OneAudio
125 × 150 mm357 partsGPL-3.011
The Wozblaster Reloaded
cristianoag
100 × 64.8 mm46 parts2LNo license10
Open covg daq pcb
lucask07
157.8 × 95.2 mm596 parts6LGPL-3.09
Daisy hardware v1
rafkhan
50.5 × 128.3 mm110 parts4LNo license9
ESP32ChrisBox
TUDA-MUST
78 × 46.3 mm177 parts4LCC-BY-4.06