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  • simple user-adjustable DIY Nixie Clock

    Yeah, I'm not sure what's causing the heat issue. The 9v supply connects through the same regulators (I didn't bother with changing the connection from 12-35 to 9v when I put the new power supply in), and the heating issue drops away. Exact same circuit, but 3 volts lower and there are no temperature problems whatsoever. This is common to the two completed clocks and the test board I built, 9v is fine but more than that and significant heating issues appear. Dropping 3v through the regulator shouldn't cause it, and the 5v regulator, which rally has more work to do, doesn't suffer the same issue dropping the 4v it has to handle so it's a bit odd.Hopefully when I complete my design I can figure it out a bit more clearly, I'd honestly prefer a switch-mode supply for efficiency anyway.

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  • simple user-adjustable DIY Nixie Clock

    I've built two of these now, using your circuit design and modified code by ruizgerman, worked back to fit your schematic.Used IN-18 tubes, and running from a 9v power supply.I did discover that a 12v power supply will cause a massive heat problem, you would need a substantial heatsink on the voltage regulators to use a 12-35v supply, and the higher the supply voltage the worse it gets. I would STRONGLY recommend using a maximum 9vDC supply voltage.I am currently working on my own schematic based on yours, eliminating a few things I don't need like the sensor inputs and the voltage regulators - I will be using a self-contained AC-DC transformer to do most of the work, and allow me to have a direct mains supply without a huge power block.The purple one was built for a friend, the wooden ...

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    I've built two of these now, using your circuit design and modified code by ruizgerman, worked back to fit your schematic.Used IN-18 tubes, and running from a 9v power supply.I did discover that a 12v power supply will cause a massive heat problem, you would need a substantial heatsink on the voltage regulators to use a 12-35v supply, and the higher the supply voltage the worse it gets. I would STRONGLY recommend using a maximum 9vDC supply voltage.I am currently working on my own schematic based on yours, eliminating a few things I don't need like the sensor inputs and the voltage regulators - I will be using a self-contained AC-DC transformer to do most of the work, and allow me to have a direct mains supply without a huge power block.The purple one was built for a friend, the wooden based one is my own one, the last digit is awaiting a replacement from the ebay seller as the tube was DOA. The silver cased clock was a kit I was given last July as a birthday gift and got me hooked on nixies in the first place.The one i am planning will hopefully make use of a self contained switchmode supply similar to http://uk.rs-online.com/web/p/switch-mode-power-supply-smps-transformers/7924379/

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