NL840 Nixie Clock Kit (No Tubes)

Price: £45.95

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  • Hobby Kit of Electronic Components.  
  • Compatible with NL840, NL841, NL842, NL844, NL845, NL846, NL900 and NL901 Nixie Tubes.  
  • Also works with Raytheon CK8754 Nixie Tubes.  
  • Tubes have 15.5mm / 0.61" digit height.  
  • Tubes are socketed for easy changing. Sockets included.

    Download Kit Assembly Instructions Here

PCB Support Pillars (15mm) not included, but available in our store

PCB Support Pillars (15mm) not included, but available in our store

· Hours, Minutes and Seconds display
· 12 or 24 hour modes
· Uses a Quartz Crystal Oscillator as the timebase
· Programmable leading zero blanking
· Date display in either DD.MM.YY,  MM.DD.YY or YY.MM.DD format
· Programmable date display each minute
· Scrolling display of date or standard display
· Alarm, with programmable snooze period
· Optional DCF / MSF / GPS synchronisation with status indicator LED
· Dedicated DST button to switch between DST and standard time
· Supercapacitor backup. Keeps time during short power outages
· Simple time setting using two buttons
· Programmable leading zero blanking
· Five programmable neon colon settings (Flashing AM/PM indication, illuminated AM/PM indication, both flashing, both on, both off)
· Seconds can be reset to zero to precisely the set time
· Programmable night mode - blanked or dimmed display to save tubes or prevent sleep disturbance
· Rear Indicator LEDs dim at night to prevent sleep disturbance
· Weekday aware ‘Master Blank’ function to turn off HV/ tubes on weekends or during working hours
· Separate modes for colon neons during night mode
· Standard, fading, or fading + scrollback display modes
· ‘Slot Machine’ cathode poisoning prevention routine
· Programmable LED tube lighting – programmmable by each hour of the day 

· Not AC frequency dependent – works in all countries
· All user preferences stored to non-volatile memory

Download Kit Assembly Instructions Here

All electronic components are provided, except power supply and tubes

All transistors, resistors, capacitors, ICs, diodes etc.
2 X Neon bulbs for hours:minutes:seconds separators
Double sided, plated - through - hole PCB
Fully pre-programmed PIC microcontroller, with socket

66 X 1mm socket receptacles for the NL840 tubes

Compatible with our Micro GPS time synchronisation receiver:

The NL84x tubes mount in sockets, so changing a tube is simple.
The sockets are included in the kit.

Uses DC power supply (12V, minimum 250 mA) This is not supplied.

We have suitable power adapters here.


Case not included, but available in our store

You will need a 500mA 12V DC Power Adapter. It is not included, but you can find the specification here, and if you don't already have one at home or office, we have them for sale.

Download Kit Assembly Instructions Here

LED Backlights are included, and you can choose from a range of other colours below.
Please select your choice of tube backlighting colour below before adding the item to your cart


  • Model:
  • Shipping Weight: 0.18kgs
  • 0 Units in Stock

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