PRR

High voltage, ground, and human body
« on: January 05, 2013, 01:57:26 AM »
http://www.youtube.com/watch?v=RtlYi1yLTVQ

1:26

You don't need to listen, just watch.


CJ

Re: High voltage, ground, and human body
« Reply #1 on: January 05, 2013, 03:13:16 AM »
hilarious!  ;D ;D ;D

now where's the one pound fish guy?

If I can't fix it, I can fix it so nobody else can!
Frank's Tube Page: www.mif.pg.gda.pl/homepages/frank/vs.html
Guitar Amps: http://bmamps.com/Tech_sch.html

MagnetoSound

Re: High voltage, ground, and human body
« Reply #2 on: January 05, 2013, 06:40:33 AM »

Major guffaws! Way to keep a straight face.

The capacitor one is hilarious too.  :)
Dan

I don't think people realize what an embarrassment of riches this place is   -  Paul Gold

deuce42

Re: High voltage, ground, and human body
« Reply #3 on: January 05, 2013, 08:39:04 AM »
ah i enjoyed this one .

EmRR

Re: High voltage, ground, and human body
« Reply #4 on: January 05, 2013, 10:26:58 AM »
Excellent. 
Best,

Doug Williams
Electromagnetic Radiation Recorders

"I think this can be better. Some kind of control that's intuitive, not complicated like a single knob" - Crusty

"Back when everything sounde

Kingston

Re: High voltage, ground, and human body
« Reply #5 on: January 05, 2013, 10:38:53 AM »
on the importance of drain resistors, among other things.

JohnRoberts

Re: High voltage, ground, and human body
« Reply #6 on: January 05, 2013, 12:17:44 PM »
Love it... that is internet advice in a nutshell. A cross between Mr wizard and jackass IX.

Funny thing is he appears to be a very slow learner  ;D ;D, if that was not staged.   ::)

It happens to be very informative by accident if it wasn't done on purpose.

JR
Don't only half-ass tune your drums. Visit https://circularscience.com to hear what properly "cleared" drums sound like.

Kingston

Re: High voltage, ground, and human body
« Reply #7 on: January 05, 2013, 12:30:23 PM »
It happens to be very informative by accident if it wasn't done on purpose.

Seems almost like a really well done instructional video. University primer.

DaveP

Re: High voltage, ground, and human body
« Reply #8 on: January 05, 2013, 12:39:15 PM »
I've got a 50kV "Tesla" like that at work and treat it with great respect.  I wouldn't make a video like that for any money, he must have done it by accident no sane person would deliberately set that up beforehand!!
I once got a belt from a CRT in an old style TV tube at those voltages and it caused my heart to flutter for about 20 minutes, wouldn't recommend it!
best
DaveP
Soundcloud: Delayed Action.

JohnRoberts

Re: High voltage, ground, and human body
« Reply #9 on: January 05, 2013, 01:02:45 PM »
Indeed it is a voltage phenomenon, but the damage is caused by current that flows after the air path is ionized, like lightning.

Lots of science fair Van de Graf generators are harmless, and that ESD tester is surely set to sub-lethal current limits. High voltage can really get our undivided attention without killing us, as TASER weapons demonstrate. 

We have all seen the energy a lightning strike can release literally exploding trees. I used to have a old shop vacuum cleaner that was an accidental Van de Graf. After using it for a few minutes it would charge you up for a nasty discharge. I attached a several megOhm resistor to my light switch ground screw so I could discharge myself painlessly. In hindsight I should have fixed the vacuum. It probably had a faulty line cord ground, or was just a crap design.   

Who here hasn't been zipped by high voltage... ? (yet). I worry about the power company line workers, they can really get hurt if they screw up, because that high voltage has beaucoup current behind it... When the squirrels short across a high voltage fuse, there usually isn't much squirrel left to police up. Many people are a little too casual about the more modest mains voltage, and pay the ultimate price.

Be careful. 

Note: There was a recent thread about danger associated with phantom voltage (48V) and that is mostly harmless. !20VAC (165V peak) can be deadly in the right circumstances.

JR
Don't only half-ass tune your drums. Visit https://circularscience.com to hear what properly "cleared" drums sound like.


audiomixer

Re: High voltage, ground, and human body
« Reply #10 on: January 05, 2013, 01:44:40 PM »
Indeed one of the funniest ones! best part is that he 'knows' it will zap him and does it anyway!


- Michael

JamesW

Re: High voltage, ground, and human body
« Reply #11 on: January 05, 2013, 02:06:40 PM »
Whats that old teaching method repeat at least 3 times
Subject to change with out notice

PRR

Re: High voltage, ground, and human body
« Reply #12 on: January 05, 2013, 03:37:26 PM »
Apparently this is his schtick.

What happens if you connect a car battery and _then_ feed the wires under the bench? http://www.electroboom.com/?p=68

What is that negative sign on the capacitor?
http://www.electroboom.com/?p=56

Can you get in trouble with 41V?
http://www.electroboom.com/?p=29

I must point out some oversimplification there. The frequency matters little until you get far past power or audio tones. And his "100K" for skin resistance is reasonable..... IF normally dry. I have been reading about swim-pool and hot-tub incidents. When well soaked you can be under 1K. Even 300 ohms. The can't-let-go threshold for adult males is >4mA, but lower for children. (In tests, children may not even try to let-go, just cry.) You can make a  case for a 1V limit. Fibrillation may need 30mA, which makes 10V potentially deadly.

sahib

Re: High voltage, ground, and human body
« Reply #13 on: January 05, 2013, 03:51:21 PM »

I nearly choked of laughter. The guy is good. I mean a good engineer.


Ethan

Re: High voltage, ground, and human body
« Reply #14 on: January 05, 2013, 03:56:02 PM »
Brilliant!
He doesn't seem to be making any more videos.
I hope that doesn't mean he's been permanently discharged. :o
I am just the Web Geek here.

Rochey

Re: High voltage, ground, and human body
« Reply #15 on: January 05, 2013, 03:57:34 PM »
Man! He must know its coming!
Expat Audio Home: http://www.expataudio.com

deuce42

Re: High voltage, ground, and human body
« Reply #16 on: January 06, 2013, 12:57:27 AM »
Brilliant!
He doesn't seem to be making any more videos.
I hope that doesn't mean he's been permanently discharged. :o

Hah - hadn't considered that. You might be right!

radiance

Re: High voltage, ground, and human body
« Reply #17 on: January 06, 2013, 11:40:26 AM »
LOL!
"Knowing that you are dreaming, however, does not automatically guarantee full rationality.
Then again, being awake doesn't ensure good thinking, either." -  Lynne Levitan


 

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