Me when I have to work on anything remotely high voltage... ⚡💥🔥

Dad was an electrical engineer, and his stories of stuff he's seen both in and out of the Navy STILL haunts me.   

Art by: @shapoco

@catsalad reverse polarising a lytic makes the most satisfying paf but stank
@weezmgk @catsalad oh wait till you see a slow-roasted reversed or shorted tantalum lol
As I recall this was with the current limited to 2.5A, which led to the cap's failure taking a while and going out with what looks like a character in a Tex Avery cartoon feeling overwhelming desire
https://www.youtube.com/watch?v=WAC9m0xhlWU
Tantalum cap bites it!!

YouTube

@weezmgk @catsalad at one of my old jobs we had just dozens of organizer cabinets of new old stock parts including hundreds of values of capacitors where all the tantalums and electrolytics had been stored under high humidity and weird temperatures long enough that almost all of them were failed short if you tried to use them, so every now and then I'd try to charge one up as a stress relief measure

anyway here's wonderwall
https://www.youtube.com/watch?v=ftK_UYMKNb0

Capaci-splosion

YouTube
@catsalad Yeah, high voltage can be scary, especially if there's any appreciable current flow.
@catsalad I love* that capacitors can gain a charge from just sitting outside.
*for values of love analogous to how !fun! is fun

@whereisthespai @catsalad I still remember the lesson of clueless, non electrical but more mechanic-y kid me, dismantling a cheap broken camera and touching the flash capacitor 😬

My whole right arm did not forget the experience 😅

@catsalad ahhh that is an amazing artpiece!! ​

@catsalad

Me, waiting to see the VP of Engineering.

Facilities guy is talking to the VP.

VP - "Is the conveyor furnace electrical issue solved yet?"
FG - "No."
VP - "Why don't *you* fix it?"
FG - <laugh> "Hell no, that's 440. I've got an outside electrician coming in, he's expendable."

@catsalad
One of the pioneering/mad-genius engineers who kept the “border-blaster” radio stations on the air at up to 1,000,000 watts of power (in radio terms), died when an inexperienced employee came in and changed something in their very unorthodox setup

“Who cleaned my desk?”⚡️💀

Border Radio
Quacks, Yodelers, Pitchmen, Psychics, and Other Amazing Broadcasters of the American Airwaves, Revised Edition
by Gene Fowler and Bill Crawford

Great book:
https://utpress.utexas.edu/9780292789142/
#Radio

Border Radio

Before the Internet brought the world together, there was border radio. These mega-watt "border blaster" stations, set up just across the Mexican border to e...

University of Texas Press

@AccordionBruce @catsalad I think I'd heard of this one before or something similar - some "brilliant" person separated the HV power supplies and power amplifiers of two different but identical transmitters, which allowed HV to be applied to a cabinet that was opened for service, defeating the interlocks, if the switch to cross over the output of one's PSU to the other's cabinet was used.

Thankfully I have never seen such an arrangement but if I did I'd refuse to work on it

@catsalad I'm kind of in love with the fact that robotics is cheap enough now that they actually build machines that you can remote trigger to throw the switch on high-current toggles, just in case.

The whole point of the switch is to control that current, and the chance that it'll respond to a human triggering it by arc-flashing them into photon soup is still high enough to justify building some remote-triggerable mechanical fingies.

@ElectroFetish I need to look for more of this artist's work! These are great
@catsalad of the interesting things in the illustrations can be seen in an entertaining manga
@catsalad @ElectroFetish thanks for including the name in the alt text! Followed them on https://www.instagram.com/shapoco/ 😁
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@catsalad my grandfather had this story about the hydroelectric plant he worked at, where a "fuse" blew one stormy night. It made a crater in the reinforced concrete wall it was mounted on and the copper it was made of coated the surface of the hole. It's possibly still there as a warning for the newbies.
He'd heard the fuse blow from his house which was about 1km away from the turbine room.
I'm nervous as soon as the voltage goes above 5V and a few mA. Worked on power mains devices reluctantly
@catsalad trigger warning for backwards capacitor please
@quantensalat @catsalad
Backwards cap and the supply set to 30V or 50V.
@catsalad this graphic is so cute!
@catsalad a healthy respect is wisdom. Whew.
@catsalad I worked in telco for a bit.. They kept a non-conductive cane over by the DC battery plant. Always interesting to see the faces of folks who asked what it was for.
@catsalad I know my limits: Electrical and heights.

@catsalad sorry to mansplain here... But the alt text is incorrect. The device is not a "power tester" but a power supply for up to 30V. And in addition the girls are hiding behind the sand bags because the electrolyte capacitor connected in reverse polarity will explode when the output of the power supply will be turned on (even at low voltage because of the reverse polarity).

So you are correct to be very afraid of electricity in this case 😉

@catsalad I remember a story featuring setting probes to the wrong test points and a bolt of lightning exiting the dude into the bulkhead.
@catsalad my friend in university took one of the tiny resistors meant for low voltage circuits and plugged it into the mains in a lab. The thing blew up, but nobody was hurt.
@catsalad @shapoco Human ingenuity will not be denied.
@12thRITS @shapoco That is so cursed! ⚡⁠🔌

@catsalad @12thRITS @shapoco

British plugs: Safe, unwieldy, thoroughly unique in the world.

American plugs: Feels like you're gonna set everything on fire just by touching them. Also apparently they love high amps because that's... "safe"?

(I am European plug enjoyer).

@WhyNotZoidberg @catsalad @12thRITS @shapoco not entirely unique. We use the same plug in Ireland.
@12thRITS @catsalad @shapoco i should've submitted this as a joke while i was busy applying for mit. call it red neck engineering.
@12thRITS @catsalad @shapoco isn't this an australian style plug and not american 🤓
@atom @catsalad @shapoco Could be. I'm so provincial I only know the American e-z shock style plugs.
@shapoco @12thRITS @catsalad @atom Can confirm that outlet is an Australian outlet, not a European outlet (at least Europe doesn’t use those outlets to my knowledge) 🤓
@12thRITS @catsalad @shapoco Is this the hack when you don't have a match?