Open-source boards designed in KiCad by flintwinters on GitHub, from 2 repositories. A board’s address here is its repository’s there.
flintwinters/electrode
This repository contains a single INA333/OPA2192/TLC555/LM386M-1 sonifier schematic. The PCB retains its manual footprint placement and has a provisional two-layer signal route with one PGND net and thermal-relief pours…
flintwinters/helix-hardware
KiCad 10 schematic for a USB powered STM32C071FBP6 with one shared SPI bus. The WIZ850io W5500 module and a 3.3 V, six wire microSD SPI breakout have separate chip selects. SWD is available for first firmware bring-up.