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| 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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