34 open source boards using the 6N138
Real designs built with the 6N138, from public GitHub projects: a quick way to see how others power, decouple and connect it. Each board comes with its KiCad files, full parts list and a render — and you can simulate its firmware on HardLabs.
RP2040/RP2350AS3397 proto DIP
PhysicsDptAngers
167.6 × 97.5 mm138 parts2LMIT87
NXPTeensy eurorack
newdigate
64.8 × 109.2 mm52 parts2LMIT27
NXPFjol
hallmar
184.7 × 110.7 mm204 parts2LNo license21
MIDI4MiSTer
KabukiFlux
44 × 44.8 mm27 parts2LMIT13
AVR/ArduinoBeat707
FrankBuss
276.9 × 142.2 mm263 parts2LNo license11
AVR/ArduinoMainboard
jypma
39.4 × 108 mm122 parts2LNo license8
SoundX
SukkoPera
60.8 × 100 mm44 parts2LNo license8
Midi uart adapter
tschiemer
39.4 × 48.3 mm11 parts2LMIT5
WEASEL
joebmz98
335 × 200 mm216 parts2LMIT3
RP2040/RP2350V4d2 pico
tomcombriat
54.2 × 94.2 mm99 parts2LTAPR-OHL-1.03
Noise toaster
adeboni
128 × 129 mm133 parts2LGPL-3.01
ESP32T8-Sequencer
lluisestape-upc
290 × 210 mm96 parts2LMIT1
ESP32Esp32-midi processor
andymann
108 × 97.4 mm50 parts2LNo license1
RP2040/RP2350PicoTracker th
alexbonhomme
91.4 × 110 mm29 parts2LNo license1
Microchip SAMSamd21g midi tool
81.4 × 60 mm54 parts4LMIT0
Teensy eurorack breakout
110.5 × 111.1 mm73 parts2LMIT258
AVR/ArduinoLights
telec16
50 × 200 mm115 parts2LNo license16
WEASEL KiCad MainBoard
335 × 200 mm216 parts2LMIT3
RP2040/RP2350V4d3 pico
54.2 × 94.2 mm99 parts2LTAPR-OHL-1.03
AVR/ArduinoPluralsight Drumkit
jzkmath
101.6 × 53.3 mm24 parts2LGPL-3.02
MIDI 5V I/O circuit
6r1d
50 × 40 mm18 parts2LMIT2
AVR/ArduinoLights back
50 × 174 mm99 parts2LNo license16
AVR/ArduinoBrain board
100 × 100 mm70 parts2LNo license11
NXPClarinoid devboard
thenfour
257 × 174 mm112 parts2LNo license4
RP2040/RP2350V4 pico
54.2 × 95.2 mm96 parts2LTAPR-OHL-1.03
AVR/ArduinoPluralsight Drumkit RevB Interface
71.6 × 53.3 mm13 parts2LGPL-3.02
AVR/ArduinoSynmidi
Bad-Dog-Designs
40 × 218 mm91 parts2LGPL-2.014
NXPClarinoid bodytest
258 × 28 mm106 parts2LNo license4
RP2040/RP2350V4d1 pico
54.2 × 95.2 mm96 parts2LTAPR-OHL-1.03
Raspberry PiAS3397-Conductor
97.3 × 97.8 mm53 parts2LMIT87
NXPClarinoid3
544.8 × 236.2 mm32 parts2LNo license4
Synmidi Midi
40 × 55 mm12 parts2LGPL-2.014
Midiperformer
45 × 42 mm23 parts2LNo license4
AVR/ArduinoMIDI to CV
PancakeLegend
30 × 100 mm18 parts2LGPL-3.02
The 6N138 in open source designs
The gallery holds 34 open source boards using the 6N138 from 22 GitHub repositories; a typical one measures about 76.5 × 100 mm and carries around 82 components.
97% are two-layer designs, the rest use four layers or more, and 62% carry an open source license.
The most starred is Teensy eurorack breakout by newdigate.
Parts used alongside the 6N138
Microcontrollers on boards using the 6N138
What boards using the 6N138 are built for
6N138: common questions
Where can I find a 6N138 reference design?
Each of the 34 boards on this page is a real design using the 6N138. Open one to see how it is wired up, with the full BOM, a render of the layout and links to its KiCad files.
What parts are used alongside the 6N138?
The L7805, 74HC14, 74HC165, AD5754BREZ and AD7606BSTZ appear in the most repositories here.
Which microcontrollers do boards using the 6N138 use?
Most are built on AVR/Arduino (9), RP2040/RP2350 (6), NXP (5) and ESP32 (2).
How big is a typical board using the 6N138?
The median is 76.5 × 100 mm, and 97% are two-layer designs.
What is the most popular open source board using the 6N138?
By GitHub stars, Teensy eurorack breakout by newdigate, with 258 stars.
Can I simulate one of these boards using the 6N138 before building it?
Yes. HardLabs turns a board's netlist and BOM into a working simulation, so you can boot and test firmware against it with no hardware on your desk.