How to Make a Primitive LED with Silicon Carbide
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- Опубликовано: 19 май 2018
- In 1907 Captain Henry Joseph Round applied a voltage to a piece of silicon carbide (SiC), also know as Carborundum. He saw that it gave light. It is a phenomenon known as electroluminiscence and it was the first ancestor of the LED or Light Emitting Diode.
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en.wikipedia.org/wiki/Diode
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That is a really cool demo!
Thank you very much!
I just bought some of this not knowing what it was, and stumbled upon this video trying to learn more about it.
I'm so excited to try this!
I like the KSP reference
Thanks for the demo ... very cool!
Awesome demo!
That's really cool
Thanks for making this demonstration!
Thank you very much for your comment!
Beautiful.
Fascinating!!! did you experiment with varying voltages? If so, what were the results? and how much current required for particular voltages? It seems to me, that if more experimentation with refined materials had been done, this could have been the path to some of the earliest electric lighting at the time... Look at leds now...surpassing incandescence... SUBBED
ive gotten blue light from a homemade sic led
Tried to replicate your experiment, but at any DC voltage from 10V - 60V, and current limiting from 0.5A to 2.5A, I could not get any glowing using the aluminium foil as the positive and the needle as the negative. Tried reversing the polarity, different probes, different positions. Can you give any hint as to what voltages you used, any current limiting, and whether you used AC (seemed like DC in your video)?
DC. The key is to be very pacient looking for the spot, the crystal that works. Do it with low light and look close to the spot. Perhaps an ammeter in series with the circuit could help telling you if the current is travelling through the silicon carbide.
@@tinkerbit thanks for the reply! Oh current is definitely flowing, by then end of 10 mins of touching different spots, the mineral is warm to the touch, and I get current flows of between 5W and 25W commonly. I have occasionally gotten a brief bright orange flash (all of this done in the dark), but I assume that is because the current is way too high and 'burns out' the LED. Going to the original papers, 4ma to 16ma seems to be the operating range, but I just don't have a control device that low. I've tried an 100 Ohm resistor in parallel, but still, no luck.
My next attempts are going to involve: 9V batteries, a variable resistor from 0 to 1000 Ohms, and a mineral from a different source.
@@JamesBailey123 YEs, try another mineral. BTW, this is a mineral, but not a natural one. It is synthetized in a furnace.
Look here: www.ebay.com/sch/i.html?_from=R40&_trksid=p2380057.m570.l1313&_nkw=carborundum&_sacat=0
Some are very cheap.
Good luck!
Is there any way to find silicon carbide in everyday appliances to try it out?
silicon carbide grinding wheels and sandpaper but I have no idea if it would work, the particles may be too small
www.amazon.com/Exact-Replacements-Erig9998-Universal-Igniter/dp/B006ZZU55Y/ref=sr_1_3?ie=UTF8&qid=1526871072&sr=8-3&keywords=oven+igniter
Also in honing or shaping stones, but as zerpBot says the crystals are very small and they also may use some binder among them tah may not conduce electricity well.
It is better to look for carborundum at Ebay. They are cheap and with free shipping in many cases.
$130 old dollars for a shitty led, damn. BTW, how much current can you push through that piece of SiC? Wouldnt using a smaller chunck help with the voltage? maybe you could try grinding a small flat piece with a dremel and a diamong wheel. I think they use some nickel alloy to braze the SiC tools, maybe nickel can wet it though you'd need some serious heat to melt nickel.
Edit: Wikipedia says silver or copper aloys for brazing, so it would be a matter of trying.
Snow!