Nixie clock that synchronizes over NTP
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README.md

README.md

Nixie-NTP

Nixie clock with NTP synchronisation

Like every amateur electrical engineer, I felt the need to make my own nixie clock. However, I decided to add a bit of modern day tech and have the clock set itself over NTP instead of requiring the user to manually adjust buttons.

The schematics provided detail the two boards - one control (arduino, ethernet) and one display (shift registers, high voltage transistors).

Partlist

(Digikey P/N in parens)

Logic:

  • Atmega 328P (ATMEGA328-PU-ND / $3.01)
  • Silvertel A9700 PoE module (N/A / $10)
  • ENC28J60 ethernet PHY (ENC28J60-I/SO-ND / $2.83)
  • RB1-125BHQ1A RJ45 jack with magnetics (N/A / $3.00)
  • LM1117 3.3V regulator (LM1117T-3.3/NOPB-ND / $1.49)

12-200V DC Boost:

  • 0.1uF 250V film cap (PCF1412CT-ND / $2.25)
  • 4.7uF 450V alum cap (493-6196-1-ND / $1.51)
  • MAX1771 DC-DC switching controller (MAX1771EPA+-ND / $7.23)
  • 250V MOSFET (IRF644PBF-ND / $1.23)
  • 100uF 20V tantalum cap (478-1746-1-ND / $2.52)
  • 0.1uF 25V ceramic cap (490-1726-1-ND / $0.05)
  • 10uF 25V tantalum cap (478-1762-1-ND / $1.02)
  • 300V diode (ES2F-E3/52TGICT-ND / $0.40)
  • 10k resistor (311-10.0KCRCT-ND / $0.02)
  • 100uH inductor (M8603CT-ND / $0.81)
  • 1.5M resistor (PT1.5MXCT-ND / $0.80)
  • 0.05 ohm resistor (P50MCT-ND / $1.14)
  • 5k trimmer pot (3214W-502ECT-ND / $3.18)

Display Board

  • LS595 shift register with latch (296-1600-5-ND, $0.62)
  • MPSA42 (or similar) high voltage transistors (MPSA42FS-ND, $0.22)
  • Nixie tubes (Eagle footprint designed around the IN-14, YMMV)
  • 1k resistors for regulating transistor base current
  • 15k resistors for limiting nixie current

Pretty pictures

Pretty Logic Display Logic