2 layers90 × 50 mm

HB9TRU Transistor Audion
USKA-FOS/HB9TRU-Transistor-Audion
Transistor-based Audion radio for shortwave reception
33 parts4CC0-1.0
Boards in 4 GitHub repositories, designed in KiCad, that use the BC848C by ALJ (-55℃~+150℃ 1 NPN 100MHz 100mA 100nA 200mW 30V 500mV 6V 800 NPN SOT-23 Bipolar (BJT) ROHS). See how each wires it, with its parts, size, README and files; the BC848C’s symbol, footprint and pinout are on its own page.

USKA-FOS/HB9TRU-Transistor-Audion
Transistor-based Audion radio for shortwave reception

dunkelstern/NightClock
Small SMD based night clock with RTC and battery/supercap backup

Max-Brants/ZoneTherm
A normal OpenTherm setup is one thermostat talking to one boiler. ZoneTherm sits in the middle of seven of those conversations at once:
