Category: IN-14 Nixie Clock

IN-14 Nixie Clock

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.


Schema Bodem Print Schema Driver Print Schema Buis Print
Print Print Print


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.

Foto Voorkant

Foto Achterkant



I’m basing the enclosure on the Ice Tube Clock from Adafruit:

Ice Tube Clock


Display test:

Clock ready:

IN-14 Nixie Clock – Update

This week I received some Plexiglas, and milled a enclosure out of it.


Nixie klok

Nixie klok



– Code: View

– Code: Download

-12h Code: Download

– Part List: Download








IN-14 Nixie Clock – Update

At request I changed the code to a 12h version. However the time still needs to be entered in 24h mode because there is no AM/PM indicator, otherwise it can happen that the date jumps forward at noon instead of midnight.

12h code: Download.

IN-14 Nixie Clock – Update

I wanted to build an extra clock with some extra nixies I had laying around. Therefore I had some pcb’s made, that way it looks a bit more professional. The old clock above will probably be taken apart en mounted on a new pcb.


The pcb without components:


Milling the tabs of the pcb:


Clock ready (With the old clock in the background):