Boards in 3 GitHub repositories, designed in KiCad, that use the BCP53-16 by Jiangsu Changjing Electronics Technology (CJ) (-65℃~+150℃ 1 PNP 1.5W 100 100MHz 100nA 1A 500mV 5V 80V PNP SOT-223 Bipolar (BJT) ROHS). See how each wires it, with its parts, size, README and files; the BCP53-16’s symbol, footprint and pinout are on its own page.
Diode663/ESP32_4-20mA_Sensor
Single-channel industrial 4-20 mA current-loop reader for ESPHome / Home Assistant. ESP32-S3 + INA226, USB-C powered, 24 V loop supply with a constant-current limiter. KiCad 10, generated from Python.
PE1RGU/hf-antenna-switch
Remote HF antenna switch: 3 radios x 4 antennas (path to 8), outdoor relay unit with a hardware safety chain, controlled over Cat6 from a shack interface. KiCad 10, open hardware, designed together with an AI.