Electronics > Projects, Designs, and Technical Stuff
It looks for me as stupid schematic (Oldtimers welcome!)
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SiliconWizard:

--- Quote from: 001 on September 30, 2019, 06:36:30 pm ---Do You have some ideas about possible improovments? Is hfe critical here?

--- End quote ---

Well, re-read the thread. Others have suggested a couple things. Add a series resistor to the grid. Add a current limiter. Add a fuse at the input.
You could also add some kind of physical protection (like a plastic shell or something) around the high-voltage part, so there's less chance you touch it when you're experimenting with the board.


--- Quote from: 001 on September 30, 2019, 06:36:30 pm ---Is hfe critical here?

--- End quote ---

Probably not that much.


--- Quote from: 001 on September 30, 2019, 06:36:30 pm ---I`m drunk for at least last 56yrs so I can

--- End quote ---

No comment. But still be careful, I don't think it gets any better with age.  ;D
001:
Thanx for Yours comments

But I still misunderstood why transistor didn`t blow when base-emitter  voltage  rises to 300-75=225V instead 5V  :-//
SiliconWizard:

--- Quote from: 001 on October 01, 2019, 01:35:32 pm ---But I still misunderstood why transistor didn`t blow when base-emitter  voltage  rises to 300-75=225V instead 5V  :-//

--- End quote ---

Because it doesn't?
001:
OLALA! I GET SOMETHING SIMILAR!

Can U tell me is it good idea to use  MOSFETs? Why author use neon bulb instead zeners?
Check this:

ArthurDent:
001 - "Why author use neon bulb instead zeners?"

The 0A2 is not a neon bulb as you imagine it but a 7-pin miniature gas filled cold cathode tube designed to be a voltage regulator with fairly tight regulation, unlike a neon bulb designed to be a really cheap indicator lamp.

http://www.mif.pg.gda.pl/homepages/frank/sheets/035/0/0A2.pdf
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