Dr. Scott M. Baker

Experimenting with IN-13 bargraph nixie tubes

by admin on Jul.17, 2010, under Electronics Projects

One of the less popular types of nixie tubes are the bargraph display tubes. The part numbers are IN-9 and IN-13. What’s nice about these tubes is that you can get a continuous bargraph display — it makes a nice alternative to a discrete LED display. People have used them in VU meters and similar circuits.

The IN-13 is the easier of the two tubes to drive, and it’s surprisingly simple. The hardest part is that you’ll need a good 150 VDC supply to power it. I build a little boost converter that runs off 12vdc to provide the 150 VDC. The control the indicator, a simple transistor driver is used using a MJE340 transistor, a resistor, and a pot.

Note that R4 and C1 are only necessary if you’re using a microcontroller that does not have analog outputs (such as the propeller). My goal is to interface the display to a a prop microcontroller so I can use it as an indicator in a few projects. So far, I’ve used a simple PWM output circuit to drive the transistor. Below is a youtube video:

8 Comments for this entry

  • tobias

    Could you please post your schematic and layout for the 150 V booster?
    I have some IN-12 tubes here and I would like not to use a transformer to power it up
    Nice work so far!

  • admin

    Certainly! a new page is now up for the high voltage power supply.

  • hegere

    Please i need a circuit that will give me 150vdc from a 12v battery ….any ideas…. Thanks

  • James

    I am building a lamp and would like to have several of my in 13’s ramp up like your in 13 demo from 0 to full power and keep repeating. I am good at electronics projects but not at circuit design. I can get them lit up but not ramping on and off like yours. I’m assuming you used a pwm of some sort to accomplish this. Do you have the pwm circuit diagram somewhere on your site?
    thanks Jim sr

  • Max

    Is the Voltage on the IND-Cathode 0V to 5V?
    And is the Nixie-Tube linear to this Voltage?

  • Krisi

    If we use an arduino, we dont need R4 & C1 right? Since I believe there are analog outputs on the arduino.

  • Davide

    Hi, my names is Davide From Italy, I’ve built my IN-13 Thermometer, I use it for indoor temperature It’s switch-ON every days so IN-13 tube has poison cathode problem….I think because the IN-13 bar stay fix for a long time.
    How I can remove that problem?

    Thanks for your suggestion!

  • Richard Scales

    Hello, I just discovered your helpful circuit and will be forging ahead with it for at least a couple of projects that I have in mind.
    Has anything changed since you did this back in 2010, would you improve anything?
    What is the purpose of the trim-pot?
    I would be using an Arduino – probably a Nano as it has more than enough pwm outputs for the job.
    Does that sound like a good plan?
    Kind regards
    Richard Scales

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