Mmmm, glowie –
Single Tube clock blinks out the current time number by number. Quite easy to read! This clock is utilizing a Russian Ð˜Ð-1 (IN-1) Nixie Tube & Socket. The PCB was home-made using the board designed by SQ8CBY. The original design and code for the PIC 16F84A was created by Electronics and More. The board incorporates both a High Voltage step-up circuit (originally designed by Lance Turner) and logic. The clock is powered by a 9v wall-wart.
Single tube nixie clock – Link.