7 open source boards using the LS74
Real designs built with the LS74, 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.
Olivetti M20 L1 schematics
anchorz
457.1 × 308 mm410 parts4LMIT4
TA8-FDC
felge1966
160 × 100.3 mm60 parts2LGPL-3.03
AVR/ArduinoQ10MF BOARD
brijohn
281 × 79 mm44 parts2LNo license9
AVR/ArduinoQX10 Titan QXPC Memory Board
254 × 63.5 mm40 parts2LNo license9
Qx10 sound card
281 × 79 mm32 parts2LNo license9
Trigger
homebrew8088
25.4 × 21 mm6 parts2LGPL-3.027
QX-10 1MB Memory Expansion Board
281 × 79 mm22 parts2LNo license9
The LS74 in open source designs
The gallery holds 7 open source boards using the LS74 from 4 GitHub repositories; a typical one measures about 281 × 79 mm and carries around 40 components.
86% are two-layer designs, the rest use four layers or more, and 43% carry an open source license.
The most starred is Trigger by homebrew8088.
Microcontrollers on boards using the LS74
LS74: common questions
Where can I find a LS74 reference design?
Each of the 7 boards on this page is a real design using the LS74. 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 LS74?
The 74LS04, 'LS02, 'LS14 and 'LS32 appear in the most repositories here.
Which microcontrollers do boards using the LS74 use?
Most are built on AVR/Arduino (2).
How big is a typical board using the LS74?
The median is 281 × 79 mm, and 86% are two-layer designs.
What is the most popular open source board using the LS74?
By GitHub stars, Trigger by homebrew8088, with 27 stars.
Can I simulate one of these boards using the LS74 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.