Hi,
Here's a 220V, 5W home LED bulb I have scraped and tried to displace one of LEDs from heatsink,
strangely they started lighting with only heat of hot iron nuzzle...
So I wondered about making a torch that lights only by power of fireplace in a camp or at home in blackout.I thinks it's the same thing happens in solar cells.
what's your thoughts about reason and the gadget?
video:
https://streamable.com/qshc1

 

There is such a device.

It’s a thermocouple. But I don’t think you’ll get enough power to light a torch. You might have more luck using the fireplace to boil water and run a small steam generator.

 

To figure out whether it's the heat or some sort of AC inductance from your iron... Turn on iron and touch the LED before it heats up.

 

To figure out whether it's the heat or some sort of AC inductance from your iron... Turn on iron and touch the LED before it heats up.

That's exactly what I was thinking. Either your iron is grounded and you're providing a static path for electrons or your iron is NOT grounded and providing an AC noise strong enough to light the LED's.

Back in the 80's I was working at a company building a project. It had a special chip that was very delicate. So during assembly they would delay installation of that chip to the last possible moment. Once installed the system worked. But when the technician added some electronics to the job the chip would blow out. They couldn't figure it out until I happened to have my hand on the metal casing while the board was under test. I also happened to touch the power strip that was properly grounded. I felt a small AC voltage passing through my body. Apparently the outlet the computer test rig was plugged into had a ground fault, and the AC I was feeling was coming from inductance in the test cable. Some 68 volts. When the tech would touch the soldering iron - properly grounded - the 68 volts would blow out the chip. It was an accidental discovery, but one that solved the problem.

What Bender (@Wolframore) was saying, this is why I fully agree with his assessment. Incidentally, you'll probably get more light, heat and energy out of a fire than you will out of LED's lit by that fire. Testing with a cold iron should shed light on where the power is coming from.

 

thanks for the tips,It was inducted current indeed,checked with the cold iron and proved.
I had seen similar occurrence with testers and phasemeter screw drivers.
Just surprised with that kind of brightness for LEDs against a usual inducted AC voltage.

 

We used to cook lizards by taping them to poles and putting them up to the microwave waveguide... those were only the 100 watt transmitters... the real scary ones had 5kW klystron amplifiers. Either one would make fluorescent bulbs light and cook hot dogs for fun while bored in the desert... your iron is 25-40 watts @ 12-24V but the iron is a poor antenna and LED is poor receiver... it's always magic though.

 

We used to cook lizards by taping them to poles and putting them up to the microwave waveguide... those were only the 100 watt transmitters... the real scary ones had 5kW klystron amplifiers. Either one would make fluorescent bulbs light and cook hot dogs for fun while bored in the desert... your iron is 25-40 watts @ 12-24V but the iron is a poor antenna and LED is poor receiver... it's always magic though.

wow...so,be careful not to bother Tesla's soul in his coffin

 

This Elektor article claims that a thermoelectric generator powering an LED can indeed produce much more useful light than a candle alone.

https://www.elektormagazine.com/labs/peltier-lamp

 

We used to cook lizards by taping them to poles and putting them up to the microwave waveguide... those were only the 100 watt transmitters... the real scary ones had 5kW klystron amplifiers. Either one would make fluorescent bulbs light and cook hot dogs for fun while bored in the desert... your iron is 25-40 watts @ 12-24V but the iron is a poor antenna and LED is poor receiver... it's always magic though.

Did you ever see a seagull get cooked flying in front of a big radar on a navy ship? It would cook a human almost as fast. They claimed it was "only" 5 megawatts, used for spotting ICBMs from a long distance away. THAT was impressive.

 

Did you ever see a seagull get cooked flying in front of a big radar on a navy ship? It would cook a human almost as fast. They claimed it was "only" 5 megawatts, used for spotting ICBMs from a long distance away. THAT was impressive.

That’s pretty cool. Would love to see the amplifiers for that!!!

 

That’s pretty cool. Would love to see the amplifiers for that!!!

The explanation that we got was that "they were really powerful and they used microwaves", at the time the details were sort of classified.

 

Of course... we have some of that. I found a 5MW klystron amplifier for radar online.

 

ehh...looks like story of the man who said:
Buy my weapons or I will kill you

 

NOBODY had any clue what the magnetrons for the big shipboard radar system looked like. That area was far off limits and well guarded. Probably just as well, considering the power levels involved.

 

We had a running joke that said everyone work worked on them only had girls...