Boards in 2 GitHub repositories, designed in KiCad, that use the PZTA42 by Jiangsu Changjing Electronics Technology (CJ) (-55℃~+150℃ 1 NPN 100nA 1W 200mA 25 300V 500mV 50MHz 6V NPN SOT-223 Bipolar (BJT) ROHS). See how each wires it, with its parts, size, README and files; the PZTA42’s symbol, footprint and pinout are on its own page.
PennyLekas/Nixie-Clock
v1 is broken and required some bodge wires to work. I have not updated the schematic and PCB to correct my mistakes. It also has some deficencies in the dimming circuit resulint in a quiet, but audible whine.
willis936/nixie-clock-ice
Hardware and software source for a GPS nixie tube clock with delay correction.