After the electronics from my first nixie clock where ready, I wanted to build a second one. It took some time, but a few weeks ago I bought some IN-14 nixies.
The circuit is roughly the same, only I tried to make it as compact as possible. The complete clock consists of 3 stacked pcb’s. On the bottom pcb is the high voltage supply, the 5V supply, the pic, the rtc and the temperature sensor. On the middle pcb are the 74141 nixie drivers and 74HC595 shift registers. On the top print are the nixies and neon’s.
This time I used leds to indicate which data is on the nixies (time, date or temperature). This way I can save a lot of pcb space.