George Cove, a forgotten solar power pioneer, may have built a highly efficient photovoltaic panel 40 years before Bell Labs engineers invented silicon cells. If proven to work, his design could lead to less complex and more sustainable solar panels.

op amp circuit design gotchas

Instructions to export KiCad to JLC SMT assembly service

MEMS microphone supporting daisy-chaining with TDM for up to 16 mics on one data line -- would allow 32 mics on a Teensy 4

Deeeeep dive!

Optosupply LEDs in pastel colours

Ergodox variant similar to ErgoDash. More popular it seems

QMK Keyboard firmware fork for NRF52 family MCUs

Tiny well-featured NRF52840 dev board with lipo charging and USB-C. Not currently for sale anywhere but doable to manufacture. Arduino Pro Micro pinout compatible, intended for keyboards.

List of small NRF52840 boards, with USB, lipo charging features and smallest possible size. Compared with NRFMicro

Condensed ergo split keyboard. very attractive. Pro-micro-based, good candidate for NRF52840 replacement.

Project for wireless pixel runs controlled by ESP32/ESP8266 modules.

GPIB interface based on Arduino

Adafruit NDEF info

MiFare NDEF memory structure explanation document