4 open source boards using the LM331
Real designs built with the LM331, 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.
NXPPrecharge
LSUTigerRacing
133 × 98 mm113 parts2LNo license7
NXPFault Latch 2
85.8 × 94.2 mm103 parts2LNo license7
Josh Ox Ribbon Synth VCF/VCA/BBD board
JordanAceto
132.1 × 213.4 mm349 parts2LCC-BY-4.01
BPSD-2025
68.5 × 43 mm50 parts2LNo license7
The LM331 in open source designs
The gallery holds 4 open source boards using the LM331 from 2 GitHub repositories; a typical one measures about 108.9 × 96.1 mm and carries around 108 components.
100% are two-layer designs, the rest use four layers or more, and 25% carry an open source license.
The most starred is Precharge by LSUTigerRacing.
Microcontrollers on boards using the LM331
What boards using the LM331 are built for
LM331: common questions
Where can I find a LM331 reference design?
Each of the 4 boards on this page is a real design using the LM331. 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 LM331 use?
Most are built on NXP (2).
How big is a typical board using the LM331?
The median is 108.9 × 96.1 mm, and 100% are two-layer designs.
What is the most popular open source board using the LM331?
By GitHub stars, Precharge by LSUTigerRacing, with 7 stars.
Can I simulate one of these boards using the LM331 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.