19 open source boards using the 4066
Real designs built with the 4066, 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.
SCOPETREX
schlae
177.8 × 127 mm197 parts2LNo license245
C64-250407-Replica
bwack
390 × 179.8 mm214 parts2LCERN-OHL-1.2114
C128-mmu-256k exp
ytmytm
48.3 × 90.2 mm12 parts2LMIT26
281D
DunningtonAudio
104 × 158 mm370 parts4LGPL-3.024
Coleco original
sparkletron
168.4 × 214 mm218 parts2LMIT16
Ti99-rgb
wiesl
99.1 × 66 mm79 parts2LNo license12
AVR/ArduinoMechBoard16
SukkoPera
386.1 × 97 mm247 parts2LNo license6
STM32OpenFlowMeter
JochiSt
74 × 28 mm132 parts4LGPL-3.06
Multiplexer-8
polykit
44 × 102 mm23 parts2LNo license4
C128-bytewide color ram-1571cr expansion
23.9 × 51.3 mm7 parts2LMIT4
LogicBoard 3GE
tullulah
104.4 × 141.1 mm163 parts4LGPL-3.03
PICSimpleDigital
codeandrelax
75 × 78 mm127 parts2LMIT1
RP2040/RP2350Pico-SMSFM
knight-ryu12
76.1 × 64.1 mm31 parts2LNo license1
Coleco original main only
168.4 × 214 mm182 parts2LMIT16
LogicBoard 3GE Repro
99.2 × 101 mm159 parts4LGPL-3.03
Mistrum Klavesnice
Lazarus-L-o-n-g
277.5 × 140 mm83 parts2LCC-BY-NC-4.03
PICSimpleDigital THT electrolytes
75 × 78 mm118 parts2LMIT1
PICPT2399 basd Digital Effect Pedal (Time Manipulator)
75 × 78 mm113 parts4LMIT1- schematic only · 29 parts
Cvbs decomposer
ckarcz
29 parts2LMIT0
The 4066 in open source designs
The gallery holds 19 open source boards using the 4066 from 15 GitHub repositories; a typical one measures about 99.1 × 99 mm and carries around 127 components.
74% are two-layer designs, the rest use four layers or more, and 68% carry an open source license.
The most starred is SCOPETREX by schlae.
Microcontrollers on boards using the 4066
What boards using the 4066 are built for
4066: common questions
Where can I find a 4066 reference design?
Each of the 19 boards on this page is a real design using the 4066. 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 4066?
The 74LS00, 74LS32, 74LS138, 74LS74 and AY3-8912 appear in the most repositories here.
Which microcontrollers do boards using the 4066 use?
Most are built on PIC (3), AVR/Arduino (1), RP2040/RP2350 (1) and STM32 (1).
How big is a typical board using the 4066?
The median is 99.1 × 99 mm, and 74% are two-layer designs.
What is the most popular open source board using the 4066?
By GitHub stars, SCOPETREX by schlae, with 245 stars.
Can I simulate one of these boards using the 4066 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.