I am in big trouble with my power supply for Nixie tubes (IN 9 bargraph.)

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I need 140V -160V (150V prefered) output voltage and 10x 12mA --> ~140mA current. (~ 21W).

  1. I tried to design boost converters but I wasn't able to get one with this amount of power. Does anyone have a schematic with such a boost converter?

I prefer THT components but if it is SMD there won't be a problem.

  1. I also tried the idea with 2 transformers. One (50VA) 230V to 6VAV and one (50VA) 230VAC to 12VAC (secondary sides wired together). And I added rectifier and capacitors. But if I add a load (to reach 130mA ~ 1k2Ohm) the output voltage goes down from 160VDC to 120VDC.

So does anyone have an idea how to build a power supply with these power speficifications?

The load varies (min 0.5mA to max 130mA.)

  • \$\begingroup\$ From the Nixie applications I recall, two voltages are used + and -, so the semiconductor switches can be relatively low-voltage transistors. \$\endgroup\$ – analogsystemsrf Jun 2 at 15:56
  • \$\begingroup\$ What the heck kind (and quantity) of Nixie tubes do you have that require 21W?? Typically they're a couple mA each. \$\endgroup\$ – Spehro Pefhany Jun 2 at 16:11
  • \$\begingroup\$ @SpehroPefhany The Rodan CD-47 takes \$25\:\text{mA}\$, for example. N of those can add up. \$\endgroup\$ – jonk Jun 2 at 16:14
  • \$\begingroup\$ @jonk Okay, that's a monster Nixie. Perhaps aptly named. \$\endgroup\$ – Spehro Pefhany Jun 2 at 16:15
  • \$\begingroup\$ Just for completion and nothing more related to this question, the Rodan CD 47 specs are on a regular web page (not PDF.) The specs are in English but the page is partly "auf Deutsch" (I read German fine.) \$\endgroup\$ – jonk Jun 2 at 16:31

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