2 layers83.5 × 97.5 mm

TeleprinterHat
MattisLind/teleprinterHat
A RaspberryPi HAT that interfaces a old school teleprinter
145 parts6
Boards in 1 GitHub repository, designed in KiCad, that use the MMBTA42L by onsemi (-55℃~+150℃ 1 NPN 100nA 225mW 25 300V 500mA 500mV 50MHz 6V NPN SOT-23 Bipolar (BJT) ROHS). See how each wires it, with its parts, size, README and files; the MMBTA42L’s symbol, footprint and pinout are on its own page.

MattisLind/teleprinterHat
A RaspberryPi HAT that interfaces a old school teleprinter