Electronics > Projects, Designs, and Technical Stuff
It looks for me as stupid schematic (Oldtimers welcome!)
001:
great project
thanx a lot for charing :-+
001:
--- Quote from: Yansi on September 29, 2019, 07:19:46 pm ---With TL431 it would look like this:
(Attachment Link)
However this would only work up to the voltage limit of the 431, which would be about 25-30V. If further voltage is required, then cascode configuration may be used: you add a common base amplifier on top of it. Such amplifier has none current gain, however large voltage gain.
(Attachment Link)
In this case TR2 is what takes most of the voltage. It is a good practice to bypass R5 with a capacitor, and/or replace it with a zener diode. The R4/R5 divider shall be designed so about 10-20V is present at the base of TR2.
--- End quote ---
Is it good or bad example? http://www.next-tube.com/articles/hvs/hvrEn.pdf
T3sl4co1l:
--- Quote from: ArthurDent on September 30, 2019, 04:36:25 pm ---As I said, I made that supply 40 years ago and I'm still waiting for the 6BX7 tube to explode, maybe in 50 years.:-DD I've never ever seen a tube explode but I have seen some tube plates glow bright red.
--- End quote ---
I was referring to the OP schematic, perhaps I should've been more specific.
The same hazards do apply in your case, but with much less severity thanks to the low current capacity, huge energy capacity, and high voltage ratings (especially K-G) of the tubes in question. :)
Tim
SiliconWizard:
Indeed. The eBay kit should work fine, but is it designed to last or be safe? Not quite.
Can be an interesting starting point for those willing to experiment/learn about tubes though. Proof is that this eBay sale triggered a series of interesting points made in this thread. ;D
Oh, and while we're at it, just be careful. High voltages can be a hazard. So this is not the kind of kit for your kid's birthday, or if you're currently drunk.
:popcorn:
001:
--- Quote from: SiliconWizard on September 30, 2019, 06:16:17 pm --- Proof is that this eBay sale triggered a series of interesting points made in this thread. ;D
--- End quote ---
Do You have some ideas about possible improovments? Is hfe critical here?
--- Quote from: SiliconWizard on September 30, 2019, 06:16:17 pm --- So this is not the kind of kit for your kid's birthday, or if you're currently drunk.
--- End quote ---
I`m drunk for at least last 56yrs so I can
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