6-digit Nixie clock synchronized by GPS, adjustable to all time zones

March 15, 2016 | 11:50
Close view of the finely engraved acrylic glass enclosing

This remake of the November 2014 Precise Nixie Clock from Elektor now also displays seconds on two nixie tubes. The addition did require a microcontroller update since the original PIC18F2480 didn’t provide enough I/O-pins for two extra digits: the clock is now controlled by a PIC18F4420. A tiny neon bulb was added as separator between minutes and seconds digits. The old design used Russian IN-14 nixies, now as good as out of stock. The new version has IN-12 nixies, pin compatible with other oval shaped nixie tubes like the ZM1100 and CD56. Since these are top view nixies, we made a separate PCB for the display that can be mounted perpendicular to another PCB containing the rest of the hardware. Six 10-way (box) headers (spaced on a 100mil grid) are used for the connection between the two boards.
If you wish to use other tubes, it is easy to assemble your own display on Veroboard. A full description will be published in the May & June 2016 issue of Elektor Magazine.

A very finely engraved transparent acrylic glass* enclosing with brass tubes and blue back light is now available in the Elektor shop together with the kit containing all the parts.

* Polymethyl methacrylate (PMMA), aka Plexiglas, Acrylite, Lucite, or Perspex
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