High voltage power supply

The design is based on the TubeHobby and is the power supply used in their NC2. I built this very kit as my first nixie tube project, and you can find a review of this excellent kit in the reviews section of my blog. The circuit is a switch-mode power supply based on the popular TL494. I recommend grabbing a dozen or more of these chips from your favorite supplier, as it`s also the chip used in my plasma speaker projects.

The voltage is controlled by the potentiometer, allowing a range of XX to YY (todo: measure this) with the default components. The original design used a 250V output capacitor, but after burning one of those out with a carelessly high voltage setting, I think it`s wise to have the extra leeway afforded by a 450V cap if you have one.

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