These are some images from testing a Vacuum Tube Tesla Coil set-up. The coil is just a mock-up with parts lying around. I did not really expect it to work at all but the results are encouraging. ... https://www.youtube.com/watch?v=hsh17tJje0A
Everyone knows transformers don’t work with DC current, but anyone playing with batteries and coils probably know it’s a good way of receiving a shock. Connecting and disconnecting a DC supply to an inductor means there is a period of change and therefore not DC. This induces back EMF in the coil and is how ignition coils and fly-back transformers are driven.
It is well known that capacitors can store dangerous levels of charge that can be life threating and often have warning labels for this. The question, for thought, is could a transformer core similarly store this amount of energy? Fortunately, unlike a capacitor, the danger would only be for the time the magnetic field collapses in the core.
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https://www.youtube.com/watch?v=pEvxcNXuhmU
The Perrin tube was used to demonstrate the theory of the electron as a charged particle. The electron beam is deflected into a cup connected to an electroscope showing the beam is charges. Watch the electroscope in the video as the beam disappears from the screen.
More at http://www.tuopeek.com
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https://www.youtube.com/watch?v=0NPDAzJiNf4
Short video on a Van de Graaff generator showing how equally charges surfaces repel.
Extra video made possible by lock-down :-)
this video was edited and uploaded using solar generated electricity
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https://www.youtube.com/watch?v=eWKACuFrpO8
Deuterium (D2) is a rare form of hydrogen having a neutron in its nucleus. Often associated with ‘heavy water’ it is also used in these unusual low-pressure arc lamps used in spectroscopy. The lamp is special as it provides a nearly continues spectrum in the Ultra-Violet region from around 180nm – 300nm. This type of broad band emission relates to the molecular nature of the gas and not just the electron level transitions. The D2 gas is at low pressure but runs hotter than in other types of low-pressure spectral lights. The outer envelope is special UV glass to allow the transmission of the wide band UV emissions. The normal running voltage is around 100V with a current of 300mA and requires an ignition anode voltage of about 500V. They are designed for 2000 hours of operation.
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https://www.youtube.com/watch?v=BlzRc6ZzUgA
Just a short video to demonstrate resonant transmission by tuning two Tesla Coils to the same frequency.
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https://www.youtube.com/watch?v=ORwkjossnbg
When cathode rays tubes age one reason for poor performance is caused by the cathode’s diminishing ability to produce electrons. Attempting to “Rejuvenate” a CRT tries to correct this problem. In some cases it should be possible to image the cathode surface on the screen to see what is going on. I guess, a bit like an electron microscope. The video shows that electron emission can be improved by increasing anode voltage. This has limitations for x-ray free operation, so the preferred method is to increase the heater temperature. I heard of this technique used on black & white CRTs and have, so far, perhaps to do with the shadow mask or gun geometry, not managed this convincingly on a colour CRT.
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https://www.youtube.com/watch?v=l99e0KPtpqQ
This CRT dates back to 1960s monochrome Television. Not many of these CRTs still survive today so it is nice to fine one to play with. It is being tested here and setup as a rough oscilloscope using deflection coils, whereas electrostatic deflection is normally used in oscilloscopes. To achieve this, beam-blanking or Z-modulation is being used and this is essentially the same for both TV and CRT oscilloscopes.
More on TV electron guns : http://www.tuopeek.com/CRTs.html
Caution: Implosion and high voltage shock risks are present when working with CRTs
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https://www.youtube.com/watch?v=rX8ToUhS6Uw