On Monday, July 13, 2015 at 11:33:37 AM UTC-7, gregebert wrote: > > A good middle-ground if you are doing a custom design is to use a > power-transformer with dual primary windings, then use one of the primaries > for your HV supply. > > In the US, the 120V line-voltage will produce +170V when rectified & > filtered. This is a bit low for reliable nixie firing over the lifetime of > the tube, especially if you use a dropping resistor instead of a > constant-current driver. Using a secondary winding you can 'boost' the HV a > bit more, or you can use a voltage-doubler though the latter will waste > more energy. > All Electronics (www.allelectronics.com) has a transformer with dual 120V primaries and dual 12V/830ma secondaries (PCTX-1304) for $9.20. This is a fairly standard combination of windings for companies like Signal Transformer, and they offer other VA ratings (but much more expensive that from surplus suppliers like All Electronics). I agree that the HV from a single primary winding is a little low, but with this transfoermer, you can stack one of the 12V windings to boost the HV, and use the other 12V winding for the rest of the stuff. Disclaimer: I am an occasional customer of All Electronics and Signal Transformer.
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