Nixie Wrist Watch, 4 Digits

Introduction: Nixie Wrist Watch, 4 Digits

This project is about making a 4-digit nixie wrist watch.


small size nixie tubes (4)
Arduino pro mimi

IC 7805
IC 555
IC 74141 (or 7441)
MPSA42 Transistors (5)
MPSA92 transistors (4)
RTC module DS3231
IRF740 mosfet
UF4007 diode
33 kohm resistors (5)
22 kohm resistors (4)

100 kohm resistors (5)

10 ohm resistor
1 kohm resistor
10 kohm resistors (4)

470 kohm resistors (4)

5 kohm potentiometer

100 nF 600V capacitor

100 pF capacitor

2.2 nF capacitor

100 uH 1A inductor

Lithium polymere batteries 300 mAh (2)
On/off switch
Push buttons (2)
Female jack (smallest size)
Charger adapter (8.4 volt, 1A)
3D printed case
Watch straps

Step 1: Specifications

With the schematic circuit offered here, the watch can run at least one hour in continuous display on.
Accuracy is better than one second in a year.

Step 2: Construction

Try to use smallest components that is available (smd is preferred).
The RTC module must be very small size.
Assemble the parts on "air" to reduce the space.
More technical explanation on driving nixie tubes is available in my previous instructable (6-digit nixie clock)

Step 3: Important Note on Charging the Batteries

In order to minimize the components and size, I have not included a charge control in the design. If the batteries are fully discharged, use 8.4 volt charger for about 4 hours (display off). Disconnect the charger after complete charge to avoid damage to the batteries.

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    Abu bilal z k
    Abu bilal z k

    6 months ago

    Can you please send or post somewhere the Arduino code that you have used

    Abu bilal z k
    Abu bilal z k

    2 years ago

    What is the specific name of nixie tubes you used in this project.
    Are they IN-14 or IN-16 or IN-19
    Please help me by replying as soon as possible, im doing this project , and i am too excited to do it.
    Please reply.


    Reply 2 years ago

    They were NEC LD955A, but virtually any nixie tube can be used. The most important thing is the size, try to find nixies as small as possible

    Abu bilal z k
    Abu bilal z k

    Reply 2 years ago

    Ok thank you so much for the reply.
    Could you let me know in which software did you design the circuit diagram.
    And if you have the circuit diagram in file format, not in pdf ❌ format.
    I need the file to directly convert it to gerber file. Could you please email it to me if you have please.
    My email:

    As i am a mechanical engineer i don't know much about pcb designing.


    2 years ago

    That's cool looking. Nice job.