Six Digit Nixie Clock

This clock uses six IN-12 Nixie tubes for the time display and 4 INS-1 neon lights for the colon digit separators. The Nixie tubes are directly driven for maximum brightness, that is, these are not multiplexed. Three HV5812 chip each drive a pair of Nixie tubes. The colon neon lights are driven separately by a standard SN74HC595 shift register and MPSA42 transistors. The MCU (Microcontroller unit) is an ESP8266 based Wemos D1 Mini and the WLAN is used for time synchronization using NTP (Network Time Protocol)
All schematics and software are included in case anyone is interested in the details. However, this is not really a beginner project. The clock is driven by 170 volts so extreme care is required to avoid the danger of an electrical shock.

The complete documentation is available in the PDF file "Six Digit Nixie Clock" below as are the schematics and software.

Errata:

  1. The 1K resistor R8 in Nixie_Controller_v0.01_schematic.pdf is too weak must be bridged for correct functioning of the control button.

clock_esp_Nixie6Digit_BasicDisplayTest.zip (5.51 KB)

Nixie_Board6Digit_v0.02_schematic.pdf (94.3 KB)

Nixie_Controller_v0.01_schematic.pdf (51.8 KB)

Six Digit Nixie Clock.pdf (595 KB)

clock_esp_Nixie6Digit_v0_8P.zip (31.1 KB)