Non-isolated ESP32-C3 boards that fit in a Ø60 wall box: a relay socket module that measures power with a BL0937, a two-channel TRIAC light switch, and a version of the switch without neutral that powers itself through the lamps. They connect to Home Assistant through ESPHome and have thermal lockouts. The KiCad projects, JLCPCB-ready Gerber/BOM/CPL and ESPHome YAMLs are free to download.
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A two-stage tube preamp built with MOSFETs, an EL34 power amp and a 4x12 cab sim, followed by eight DSP effects on an STM32G473 and an ES8388. A 6-layer SMD board ready for JLCPCB; the KiCad project, Gerber/BOM/CPL and firmware source are free to download.
A tube-preamp character from four BS170s, a 17 V rail doubled from 9 V, trimpot-free bias, a Marshall tone stack and all through-hole parts: the circuit, the board and the road to Rev 2.2 of BEY-HAN Overdrive.
A faithful Rust port of Freerouting: byte-identical results to Java, five times the speed and far less memory, long-standing bugs fixed, a live view, length matching, differential pairs, controlled impedance and a KiCad plugin. Measurements and screenshots from real runs.