Instructables
I got the ideea to put an dead led to high voltage and it worked.

Step 2: High voltage supply

Invert the input with the output. Put the led at new output and power supply to new input

Step 3: Result

My output was at a low current as 20mA  but if the current is bigger the led can break fiscally the epoxy can break. You can put a diode bridge to convert from AC to DC.
 
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nmeek3 years ago
So disregarding the fact that at 300v the LED should instantly turn into a ball of flames, has anyone bought this enough to keep it on here? Shouldn't this be flagged for quality control? I mean it is dangerous and for all intents and purposes impossible.
kctess53 years ago
lol fisically
russ_hensel3 years ago
Please stay away from voltages over 35 volts until you get a bit more experience under your belt. Random experiments with 300 volts could be your last. Just want you to hang around for a good while yet.
morphic cu ion (author)  russ_hensel3 years ago
I am totally safe because the amperage is not high.
Before I started making projects with high voltage or any kind of projects I had the unpleasant experience to get electrocuted at 220v at 1amp and I survived so I know the risk
What is you estimate of the current? How much do you think it takes to kill?
morphic cu ion (author)  russ_hensel3 years ago
it depends on voltage, at 220v about 500mA is enough to kill you above 1000v 300mA will kill you for sure
I would check that out a bit more. The voltage depends mainly on ( highly variable ) skin resistance and can be much lower than 220 volts ). It is really only the current that kills and a lot depends upon how it is applied. On one hand a finger to finger shock can probably have enough current to turn the fingers to charcoal, a shock from arm to arm can have fairly low currents that will stop the heart ( and the right current can restart it ) If the current is 60 hz you may hz more (pun) See http://www.physics.ohio-state.edu/~p616/safety/fatal_current.html and think more about safety.
morphic cu ion (author)  russ_hensel3 years ago
I know the danger because I have been electrocuted many times . the worst in my opinion was when I touched the usb plug and a ground because then i didn't felt my teeth. and there were 5 volts and about 10amps. now i am starting to build a zvs driver for a flyback transformer to power up a tesla coil
yes but you said it was 10 amps. Normal USB outs on a computer are up to 500ma. The reason why you have been "electrocuted" many times is because you didn't know the dangers or you knew them but you weren't avoiding them. Besides, you might of just been shocked many times, not electrocuted. Sometimes if you are lucky, you can get electrocuted and survive, you will have burnt skin and you will be on the other side of the room.
Stay safe!
morphic cu ion (author)  dog digger3 years ago
an atx power supply about 300w gives an output at 5v with 20 amps and my computer was very old so i assumed at the usb was about 10 amps ,sorry it was my mistake.
yes I been shocked many times but also electrocuted.
"you will be on the other side of the room" this is in the movies, I got electrocuted in the arm and all my muscles in that area got tense . you are able to think in that moment and you pull your tense arm with the other or call for help.
I know people who have been thrown across the room :D

Way late to the party but, I have a friend who is a trained electrician (trained by FoMoCo)

He regularly used the back of his hand to check 415V circuits. Said after 15+ yrs, it just tickled a bit

As for the rest,

I don't know much about electronics but
and I wouldn't expect a ball of flame but probably crack or exploding
epoxy due to thermal shock?

What is the chemistry behind reviving a
'dead' LED? I have a few that were over volted (not by me) and have
turned brown, I don't think this would help them?

morphic cu ion (author)  dog digger3 years ago
wow that was a serious shock .
I just got shocked by a Hi-Fi amp. The caps were still charged and the wall plug was connected to them and It wasn't nice at all. My hand was hurting for hours!
morphic cu ion (author)  dog digger3 years ago
i know the felling i got shocked from a flash capacitor and it burnt my skin
This was low volts and high amps! Amps hurt... and kill...
A flash cap would have hurt a heck of a lot
Wait, how can a usb plug electricute you? Usually USB outlets only give up 5 volts DC and 1 ampere of power. Why did you get shocked?
Great work by the EMTs I think.
Actually, the hz allows you to let go because of the pulsing and polarity reversal. DC high voltage freezes your muscles, not enabling you to let go, and fries you in place. Yech! Disgusting, but true never the less.
Look up electrocuted - it means you were KILLED by electricity. That is where you're headed if you continue playing with such things without learning the safety rules. Never hookup the low voltage side of a transformer to line voltage to start with. VERY BAD IDEA ...OTHER PEOPLE, PLEASE DO NOT ATTEMPT THIS !!!

" and The Darwin Award goes to morphic cu ion ..."
morphic cu ion (author)  Lectric Wizard3 years ago
Sorry about my articulation because English is my second language and it is very safe, if you didn't knew you can be killed at 5 volts and even at 1.5
Actually, there is a cut-off point. You could conduct 800amps for a second and it would only tickle, if the volts were low enough - due to the very high resistance of skin at low voltages.

For example. Bill is equal to a 1500 ohm resistor. To get 0.2 amp through him you would need 300 volts.
PKM4 years ago
For the sake of your multimeter, I hope you didn't just connect it across the power supply with no other load to see "what the current was" >_<

Have you tried this with any other colour of LED? Do you know what voltage your power supply was outputting?
rhangatoby PKM4 years ago
(removed by author or community request)
i killed a 5mm LED with just a 9v battery, whoops. s'pose that's why resistors are used
I got a 3mm LED and connected it to a 12 SLA battery. It was for blowing it up on purpose but it was quite loud and it made everybody around me jump
morphic cu ion (author)  rhangatoby4 years ago
yeah it happened to me too, but not with phone battery
yup me also tried with a phone battery and burnt 3 red leds
yeah, if you have ever hooked a green frosted led up to 18 volts, it snaps right in half!
morphic cu ion (author)  zack2474 years ago
I think it is the current that snaps it not the voltage
really? i thought the voltage cracked it. it was still pretty interesting though
morphic cu ion (author)  zack2474 years ago
no because on this instructable the led was at 300v and it didn't snapped because the current was very low
My little brother put a low-power red LED on a 9 volt once and the top exploded off and shot across the room. My little bro never played with my LED's again.
I did that once and it just died a slow death (comparatively, it was a few seconds)
morphic cu ion (author)  Mdob4 years ago
yeah because if it was a new battery it had about 4amps
The beginning amperage in a 9 volt battery is ~300mAh. The LEDs were designed for .1 - 1 mA. Only 2 18650s in parallel could provide ~4 amps. It exploded nonetheless.
morphic cu ion (author)  PKM4 years ago
No, I didn't tried with other colors and output voltage is about 300v and the multimeter is ok .
I don't suppose this is going to work , but I have to say it anyway, because the last person I tried to warn didn't listen and he ended up dying. A local, popular handyman was playing with hydrogen generation on a massive scale, so as to power a good-sized diesel generator. When I by chance meeting,encountered him, his set up was crazily hazardous, using regular light switches to cut in each set of hydrogen generation plates. The wiring was a rat's nest, and his collection chamber was a Craftsman painter's pressure vessel. Insulation was haphazard, and there were no fail-safe over temperature or over-pressure devices. Nor was there enough design mechanically to assume an explosion, and to direct the force in a harmless direction. I tried to gently explain how he was rushing his experiment and needed to slow down and take things a little more slowly and carefully, and make his setup safe. He was so excited by the volumes of hydrogen generated, and his drunken friend was so 'protective' of the 'genius and reputation' of his friend, that I couldn't get another word in. It wasn't a month later that I heard that there was a huge explosion and a popular handyman had died in the blast. Police were trying to figure out what caused the explosion. I called the info hotline anonymously, and asked them to check the surroundings for signs of a hydrogen generation apparatus, and left it at that. I still wonder what else I could have said to dissuade him, but, (and this is the main point), any experimenter dealing with dangerous temperatures, chemicals, electrical potentials, pressures, or whatever. As exciting as your groundbreaking, cutting-edge experiments may be, they are still experiments, and you need to think things out, and carefully craft and lay out your experiment. Science means that someone else should duplicate your experiment and come up with the same results. All to often, it is a fluke that it works and takes weeks or months of proper reverse-engineering to figure out why, or explain the process. As far as shocks go, never hold any apparatus on your lap. Realize that with modern switching regulators, the chassis might be hot, even though the low voltage outputs are isolated. Also on the switching regulator, there is a small section that is at anywhere from the line voltage, to the peak rectified filtered line voltage. For 115 Volts, that is about 169 volts DC. One of the reasons you don't see repair manuals for microwave ovens anymore is that more than one knowledgeable technician died, having crossed the high voltage capacitor for the magnetron, before bleeder resistors were integral to them. No one wants deaths haunting them nor lawsuits, so that's why thy're gone from the shelves.
It works with a 720 VA neon transformer for a second. Then the LED catches fire and makes the garage stink for a week. Don't do it indoors.
Venemot3 years ago
By the way, why would anybody ever want to make something like this. It is dangerous and why do we use leds, because they are cheap and workat lower voltages than other sorts of bulbs.so why would anybody want to power a 2.5 volt dead led with 300v. I would describe this instructable in two words "TOTALLY INSANE"
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