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IV-9 Numitron Clock

I found some old (apparently very expensive) IV-9 Numitron tubes and decided to build a couple of clocks out of them.

alex-lunguAlex Lungu
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In one of my recent trips to a friend who deals in Soviet Electronics, I found a couple of modules, each containing 7 IV-9 Numitrons. He gave them to me for free, a gift I could not refuse.
When I got home, I started thinking of a design for a Numitron clock. I settled on a simple Atmega328 + DS1307 RTC combo. Driving the actual tubes themselves is done by TLC5916 8 bit shift registers with constant current sink outputs. Just shift the data serially in and latch it to get a display. Simple enough.
The enclosure is 3D printed, made on my A1-mini.

Bottom.stl

Bottom side of the case

Standard Tesselated Geometry - 1.00 MB - 09/19/2024 at 13:27

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Box.stl

Top side of the case

Standard Tesselated Geometry - 205.94 kB - 09/19/2024 at 13:27

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Schematic.pdf

Adobe Portable Document Format - 367.95 kB - 09/19/2024 at 13:27

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Fab Files.zip

Gerbers, Pick and Place and BOM. Just upload into JLCPCB and order.

x-zip-compressed - 155.49 kB - 09/19/2024 at 13:27

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