6 open source boards using the LM3940
Real designs built with the LM3940, 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.
AVR/ArduinoAT65C02 Hobby Computer
Kayto
241.3 × 149.9 mm161 parts2LCERN-OHL-1.27
STM32NEOM 0
wal99d
27 × 50.3 mm29 parts4LNo license2
RP2040/RP2350We816-mark2
danwerner21
360.1 × 141.4 mm128 parts2LNo license1
STM32Kedtracker
kedder
82.7 × 56.6 mm78 parts2LNo license1
RP2040/RP2350Mechanics
cclienti
110 × 75 mm81 parts2LGPL-3.00
Rfm adapter pi
fixxl
65 × 56.1 mm25 partsNo license10
The LM3940 in open source designs
The gallery holds 6 open source boards using the LM3940 from 6 GitHub repositories; a typical one measures about 96.3 × 65.8 mm and carries around 80 components.
80% are two-layer designs, the rest use four layers or more, and 33% carry an open source license.
The most starred is Rfm adapter pi by fixxl.
Parts used alongside the LM3940
Microcontrollers on boards using the LM3940
What boards using the LM3940 are built for
LM3940: common questions
Where can I find a LM3940 reference design?
Each of the 6 boards on this page is a real design using the LM3940. Open one to see how it is wired up, with the full BOM, a render of the layout and links to its KiCad files.
Which microcontrollers do boards using the LM3940 use?
Most are built on RP2040/RP2350 (2), STM32 (2) and AVR/Arduino (1).
How big is a typical board using the LM3940?
The median is 96.3 × 65.8 mm, and 80% are two-layer designs.
What is the most popular open source board using the LM3940?
By GitHub stars, Rfm adapter pi by fixxl, with 10 stars.
Can I simulate one of these boards using the LM3940 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.