6 open source boards using the 74LS20
Real designs built with the 74LS20, 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.
RC200-Dev Backplane
MarkD833
188 × 102.9 mm90 parts2LCC-BY-NC-4.08
Z80CTCDART2
lynchaj
100 × 100 mm73 parts2LNo license31
AVR/ArduinoAbuDhabi ElectronBeam
monicaespinosa
130 × 145 mm53 parts2LNo license1
RC201-68000 CPU 2
101.6 × 53.3 mm37 parts4LCC-BY-NC-4.08
Program counter and adder logic
ibm2030
220 × 160 mm29 parts2LNo license13
PC and ADDER 74LS74 MOD
220 × 160 mm28 parts2LNo license13
The 74LS20 in open source designs
The gallery holds 6 open source boards using the 74LS20 from 4 GitHub repositories; a typical one measures about 159 × 123.9 mm and carries around 45 components.
83% are two-layer designs, the rest use four layers or more, and 0% carry an open source license.
The most starred is Z80CTCDART2 by lynchaj.
Microcontrollers on boards using the 74LS20
What boards using the 74LS20 are built for
74LS20: common questions
Where can I find a 74LS20 reference design?
Each of the 6 boards on this page is a real design using the 74LS20. 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 74LS20?
The 74LS00, 74LS01 and 74LS04 appear in the most repositories here.
Which microcontrollers do boards using the 74LS20 use?
Most are built on AVR/Arduino (1).
How big is a typical board using the 74LS20?
The median is 159 × 123.9 mm, and 83% are two-layer designs.
What is the most popular open source board using the 74LS20?
By GitHub stars, Z80CTCDART2 by lynchaj, with 31 stars.
Can I simulate one of these boards using the 74LS20 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.