High voltage power supply

Posted on Feb 5, 2014

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.

High voltage power supply
Click here to download the full size of the above Circuit.

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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