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Make Your Own Retro Nixie Clock With an RTC! : 7 Steps (with Pictures) - Instructables
IN-18 Nixie Tube Clock KIT - NixieDIY
DIY Nixie tube clock with switch relays instead of transistors. Counting circuit is based on 4000series CMOS logic. Fun fact: it accepts 1pps from Rubidium frequently standard which quality this as a