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.
ADSR Panel
Fora888
58.4 × 128 mm18 parts2LMIT0
ESP32Capstone 1
colektamu
49 × 44.5 mm14 parts2LNo license0
Lm386 audio amplifier
baleshwarece-jpg
55 × 35.3 mm12 parts2LNo license0
Microduck Audio AMP R3
ldcyes
28 × 20 mm12 parts2LNo license0
CAT XLR
8-Lambda-8
46 × 120 mm9 parts2LGPL-3.00
BM83 breakout
Scaniox
65 × 32 mm8 parts2LNo license0
Vinyl adc osc
MadsRudolph
41.9 × 44 mm8 parts2LNo license0
GOL PSU Power Adapter
gatechipdl
114.3 × 96.5 mm4 parts2LMIT0- schematic only · 6 parts
Clock input
carr-james
6 parts2LNo license0 
Regulator daisy
ohmtech-rdi
20 × 19 mm8 parts2LCC-BY-SA-4.0405
MatchTester
profdc9
85 × 54 mm51 parts2LNo license221
Attenuator multiple
shmoergh
64 × 32 mm7 parts2LNo license214
Mult
nickajeglin
43.7 × 94.2 mm36 parts2LNo license207
Demod breakout
loxodes
30.8 × 50.5 mm67 parts4LNo license206
Slimline Clock Divider SMD Main
mzuelch
38.1 × 101.6 mm48 parts2LMIT165
2044vcf control
ijnekenamay
30 × 100 mm16 parts2LNo license142
Display hat
FOSDEM
31 × 65 mm9 parts2LNo license114
Leaky bucket
tpcarlson
20 × 128.5 mm110 parts2LNo license106
ESP32Gamenight
ThisIsNotRocketScience
240 × 50 mm39 parts2LMIT87
Poly UA controller 5enc 5sw
PhysicsDptAngers
139.2 × 49.3 mm26 parts2LMIT87
StepDriver
hirakuni45
32 × 37 mm19 parts2LBSD-3-Clause86
Mynd Baffle
teufelaudio
45 × 30 mm17 parts2LCC-BY-SA-4.076
Kick
bread-modular
30.5 × 68.6 mm35 parts4LMIT65
Hps07
gzweigle
38.1 × 10.2 mm5 parts2LGPL-3.060
Full bridge
98.6 × 98.6 mm46 parts2LNo license56
STM32Midi board
jkominek
88 × 45.8 mm31 parts2LCustom license53
Eurorack State-Variable Filter
Len42
50.5 × 102.9 mm68 parts2LNo license50
AVR/ArduinoUSB C PD PSU
niektb
24 × 100 mm65 parts2LCC-BY-SA-4.034
Keypad prototype
libresmartphone
40 × 60 mm30 parts2LNo license33
Breadboard supply adapter
rabidaudio
24.6 × 45.7 mm8 parts2LMIT31
CVMod8 V2 Front THT
Thorinair
100.8 × 108.6 mm75 parts2LCC-BY-SA-4.025
AVR/ArduinoVm010-channelcontrol
mirdej
30 × 181.5 mm58 parts4LNo license23
ESP32ESP32 MIDI Summer25 Wand
collaborative-music-lab
246 × 30 mm19 parts2LNo license19
ADSR
telec16
25 × 200 mm49 parts2LNo license16
Eq
bubbajfett
59 × 56.6 mm48 parts2LCC0-1.014
DSO adapter
zero-emission
71 × 17.5 mm12 parts2LNo license14
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