Electronics > Projects, Designs, and Technical Stuff

Open HV Probe 40kV

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tggzzz:

--- Quote from: wasyoungonce on April 21, 2019, 11:21:24 pm ---How’s about gel coating the probe to increase issues isolation and reduce probes ability to ingress contamination.  If gel will not adhere....even better.  Use the 3D printer in negative and use the parts printed as fibreglass moulds.  FWIW

--- End quote ---

It is easy to dream up things that might work. Where 20-40kV is concerned, any techniques need to be predictable and repeatable.

beanflying:

--- Quote from: mnementh on April 21, 2019, 11:17:23 pm ---Please understand... my primary concern here is the "open" part of this project. As soon as you put that label on something, the fuckwits start to come out of the woodworks. Building it for yourself is one thing; sharing the blueprints online is something I'd consider to be roughly akin to all the imbeciles sharing plans for 3D-printable firearms, all of which are far more likely to kill the user than anyone more deserving such fate.

I've committed numerous Darwin-award-worthy acts of stupidity with HV transformers; my grand-dad started me early helping him wind a 3KV transformer for a 160m transmitter when I was 10.  :scared:

There's a reason I don't document the details of those adventures publicly; and as anyone in the TEA will tell you, it isn't embarrassment because I have not so much as a single shred of it left in my being. ;)

mnem
*tzzzt*

--- End quote ---

There is a counter argument to that non discussion of potentially hazardous projects given the mass idiocy on youtube with a simple search on High Voltage. Discussion here in the open is educational, imformative and generally carried out by people with a greater level of understanding than the potential Darwin Award Winners.

The maths in this one is generally ok but the practical is horrifying as are the comments below it in general :scared:

https://youtu.be/RAOw0mHQRvk

mnementh:
Yes... and as obviously Darwin-Award-worthy as that video is, (cringeworthy too); it is just the tip of the iceberg for some of the stupid out there. At least that moron knows what heat-shrink tubing is.

I remember a video about one fuckwit who strung together 90 9V batteries; that is high enough voltage and high enough current capacity to stop the human heart, and he was playing around with it striking arcs for a firestarter using strands of telephone station wire.   ::)

The problem is NOT with your intent, or your level of knowledge... it is with the TL:DR takeaway that fuckwits will gain from it. You can tell them 10 times that this is dangerous, explain in great detail how and why, but once their eyes glaze over, they'll hear one word in ten and then only the explosive "action words".  :palm:

The only thing they'll take away the above mentioned video is "String 90 9V batteries together and you can play with lightning! This guy did it and didn't die!"

mnem
A little knowledge is a dangerous thing.

beanflying:
And NO or BAD Knowledge is WORSE and even MORE DANGEROUS ;)

0culus:

--- Quote from: beanflying on April 22, 2019, 12:13:50 am ---*snip*

The maths in this one is generally ok but the practical is horrifying as are the comments below it in general :scared:
*snip*

--- End quote ---

Let's start with that multimeter he's using. Those things, if they are fused at all, usually have glass fuses and are only really safe for very low voltage DC protected by a current limited supply.  :-BROKE

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