4 layers220 × 65 mm

Nixie Controller v2
DanielHeEGG/Nixie-Controller-v2
Second generation universal nixie clock controller
228 parts2CC-BY-SA-4.0
Boards in 1 GitHub repository, designed in KiCad, that use the M41T01M6F by STMicroelectronics (-40℃~+85℃ 2V~5.5V 300uA 800nA External I2C No Temperature compensation、Backup power management and battery charging、InsideSRAM/NVRAM、Power-off retention of registers SO-8 Real Time Clocks ROHS). See how each wires it, with its parts, size, README and files; the M41T01M6F’s symbol, footprint and pinout are on its own page.

DanielHeEGG/Nixie-Controller-v2
Second generation universal nixie clock controller