• EEVblog #950 – Nixie Tube Display Project – Part 2

    Some more info and experiments on driving Nixie tubes.
    Open circuit cathode voltage, open collector vs totem pole / push-pull drivers, NIxie voltage drop and pre-biasing, and using the ULN2003 with zener clamping.
    Forum HERE

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      • Ken Galer

        I wonder if just using a resistor to gnd across the digit would keep the voltage below 50V?

      • Jakub

        Use 74141 driver:-) it’s 4 bit driver for nixie tube. I have those to my nixie project, but haven’t time to done it:(

        My idea was use arduino with PCF8574 expanders (I2C), and one expander can control two, 74141 drivers. You can control nixie display by only 2 wires.

      • SA007

        If you go for the ULN2003/2803 approach, the TPIC6B595 might be an intresting chip.
        It is basically a ULN with built in shift register.

        It is bit more expensive than a combo ULN/shift register but a lot easier to route and you don’t need 2 chips.

        Unfortunately it is only 150mA, would love to get a chip like that in 500mA or better.

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