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Simple geiger counter power supply design

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Snake____1:
Hello, I am in the process of building a simple handheld geiger counter. As known by many the old sensor tubes need a voltage of around 400v DC, therein lies my question.
How can I make a simple power supply for this? Preferably something I can run from a single 18650 cell.
Attached is a simple supply I bought that I thought I could reverse engineer. But as you can see the sot23-5 and to-252 are sanded down...
Any bright ideas?

schmitt trigger:
Search for Nixie power supplies.
 With a voltage tripler on its output, I used one for a Dekatron project, which requires  510 volts.

Edit, from the photo, it appears that the tripler is already built in

jaromir:
Nixie power supplies are designed for typical nixie load, that is a few mA to few tens mA, depending on how much nixies you have. Geiger detectors, on the other hand, do require much less current, say two or three orders of magnitude less.
Quiescent current of simple nixie supplies isn't stellar, but there are circuits better suited for Geiger detectors, like the one from link https://mightyohm.com/blog/products/geiger-counter/ it has quite low quiescent current and supply range suitable for single Li-Ion.

Marco:
Lots of threads about this lately. As I said in the other thread, the Theremino design seems hard to beat for it's simplicity.

SiliconWizard:

--- Quote from: Marco on July 16, 2019, 06:29:19 pm ---Lots of threads about this lately.

--- End quote ---

Noticed that as well.

Are people starting to fear a nuclear war or something? ::)

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