Noritake GU311 Clock

An animated digital clock, made from a Noritake GU311 Vacuum Fluorescent Display.

Latest build:


Not a lot to the circuit, just a micro (the mythical attiny4313), a crystal, some caps…


…and a 2x10 female IDC header to piggyback on the much larger display board. There is a separate power connector which powers both the VFD and the clock driver. I'll never do a PCB for this one because I only have 5 of these displays and no prospects to find any more, but if I did make one, it would be super easy.


The circuit assembly is mounted in the case.


The assembled clock in action:

Firmware v2:

Original firmware:

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