4 ms·
Coherer Effect [video]
- thunderbong 3y agoThis was amazing! Never knew of this. And Mehdi is great as always! And this is certainly one of the few things on his channel that I can try at home! The wikipedia article - https://en.m.wikipedia.org/wiki/Coherer https://en.m.wikipedia.org/wiki/Coherer
- djmips 3y agoalso nicely covered in the Secret Life of Radio in context of the development of radio communication. https://youtu.be/LMxate9gegg?si=Z5pANQTsQGIosIcU https://youtu.be/LMxate9gegg?si=Z5pANQTsQGIosIcU
- extraduder_ire 3y agoI've had cheap battery operated devices that react in the same way when a lighter clicks near them. Except they stay turned on because the first thing they do is latch their power on.
- pxue 3y agoMehdi been explaining EE concepts since I was in school a decade ago. What a legend.
- seiferteric 3y agoI built one of these when I was a kid with a piece of plastic tube, filled with filings from an iron pipe and two metal pushed into either side. I tested by clicking the electric started on the stove and flicking to reset, I was amazed when it actually worked.
- smegsicle 3y agotl;dr strange device produces light in response to lighter and the light ceases after you blow on it
- RicoElectrico 3y agoThis is fascinating, but what blows my mind even more is Bose's experiments with mmWave in the order of 60 GHz (!) https://www.cv.nrao.edu/~demerson/bose/emerson_delhi.pdf https://www.cv.nrao.edu/~demerson/bose/emerson_delhi.pdf
- userbinator 3y agoDiscussed here 5 years ago: https://news.ycombinator.com/item?id=17535909 https://news.ycombinator.com/item?id=17535909
- knodi123 3y agoIt takes a great teacher to make learning a technical subject seem like good dumb fun. What a guy!
- jacquesm 3y agoIn old days there would be little vibrating hammers mounted to the side of them to 'unstick' them automatically. And that 'low power arc' is actually a few thousand volts across an airgap of a couple of millimeters, the EM from that is massive. For an encore: you can pick up lightning strikes with a long piece of rebar overwound with insulated copper wire stuck into the ground (so it's vertical). Every 'click' you pick up is a lightning strike somewhere within a few thousand km from where you are, louder clicks are closer or more energetic discharges.
- pwr22 3y agoI was wondering when watching the video if Mehdi's supposition about an oxide layer is the only thing at play or whether there could be a layer of air instead / as well?