On Monday, 4 March 2019 04:12:55 UTC+8, nixiebunny wrote: > > The voltage applied to the elements of a Nixie tube is not as > straightforward as you may think. Keep in mind that there is a voltage drop > from anode to an 'on' cathode of ~130-140 volts, due to the ionized gas. > Also, the capacitance of the tube elements and wiring has an effect on the > switching behavior. > > I have successfully made several varieties of multiplexed Nixie clocks and > watches using 60V or lower cathode switches. I used printed circuit boards > to reduce capacitance, and adjusted the timing to allow the recently turned > off cathodes to drift up to their natural 'off' voltage before turning on > the next digit's anode. > > My Nixie watch design uses 50V cathode switch arrays. It also has no anode > resistor. This is done by enabling only one cathode at a time, leaving the > other tube with no cathodes enabled. > > The power supply has a resistor current sense and feedback mechanism to > regulate the total current as well as the open-circuit voltage. Blanking is > achieved by reducing the anode voltage to 100V, with a digitally controlled > shift to the regulator feedback. > > So you can get good results with very little circuitry, if you apply a bit > of cleverness to the problem. > > http://www.cathodecorner.com/nixiewatch/firmware/nwrf-schem.gif > > The feedback regulated power supply is a very elegant solution, and I'd love to implement something like that, but my knowledge of switching power supplies isn't good enough to pull it off. I envy you.
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