Homemade Cathode Ray Tube 1

[ObiTrev]

Could a CRT be made that is as flat as a Jar lid, and still produce an image via magnetic deflection?

[XxCOLDWAR277xX]

i need to know how to make the gun

[1marcelfilms]

idea for you: make 2 coils and conect them to the coil of a tv/crt

[ObiTrev]

I have an idea for a small device with a cathode ray tube acting as the primary screen. My question is, "How flat can you make a Cathode Ray Tube, and would a deflection coil still be able to manipulate the electron beam inside?"

[DEATH666LIVES]

What you did with the coil reminds me of the beginning of David Bowie's Space Oddity video. You sir are a genius.

[kargaroc386]

i believe that most X-rays produced in tubes would come from electrons hitting the metal mask right behind the phosphorescent material.

obviously, since this has no shadow mask (like most black and white CRTs), it would produce much less ionizing radiation.

i think.

[McBeefsupreme]

did you use the transformer from a car??

[telemediav]

cool

[clony101]

dude thats fuckin cool with the coil

[MILQUETOASTE]

beszely, káposzta! Next step: video!!!

[summ22]

isn't that dangerous?

[dwarfer777]

extreamly dangerious! depending on the target it could be producing very very high intensity gamma rays

[hellsmaw84]

not quite. something small like that and regular scope tubes have no possibility of emmitting x radiation. electronicially malfunctioning larger displays can emit harmful x radiation, but the effects of long distance viewing is not possible due to the beams being obsorbed by dust and other air particles.

[airsoftdude102]

where did you get the phosphor from ?

[ShadyMan01]

@airsoftdude102. If you check out his website (link in description) he explains that he uses the coating from the inside of broken fluorescent light tubes.

[wanderingjew2008]

So, how exactly did these things help confirm the existence of electrons?

[sherbetfizz]

Cathode rays travel from cathode to anode. As cathodes attract positive charge, the particles moving across the tube exciting the gas must be negative? And negative particles are electrons, which refutes Dalton's model of indivisible atoms etc.

[freshface2991]

I learned about this in my chemistry class.

[magx1]

Impressive. Nice work. Have you attempted to measure X-ray emission from this device?

[Saira93]

Hmm ... I should try making 1 lol

[Pujc]

Awesome , you can see a scope pic so , great!!!

Nem semmi!! Házilag,nem semmi!

[GavinRoskamp]

Ok, so where's the PayPal link!? :)

[crayonswild123456789]

thats hecka cool and im learning dat in science rite now.. haha

[slapleatheru3]

Cool man cool.

[ahshleyy]

nice.

[RyuDarragh]

Hahaha.. i remember making capacitors with tin foil and wax paper, resistors with india ink or school paste and carbon, test tube vacuum triodes using tin sheets, wire and nichrome and so forth. Wonder if a complete home made TV could be made that way ? Has anyone tried ?

[noaa20]

please, what`s the name this music?

[electronic26]

used flyback transformer????

[TOBIdoesntNEEDaHUG]

My chemistry teacher showed us a cathode ray tube.

It was pretty cool.

[w5cdt]

What phosphor are you using? Zinc Sulfide?

[joerox1994]

ecodium aphorous duhhh

[noaa20]

please, what`s the name this music?

[Diamondblade2006]

Would that CRT get 'screen burn' if displaying the same image for too long?

[malmvaegen]

you mean lika a lcd? no, int would not do that... not what i know.

[Diamondblade2006]

What i mean that, if the green dot/line from the electron beam is displayed on the white material for too long, would it eventually get damaged?

[tred222]

ok, I see... well, i dont think it would damage it.

[theultimatedestroy80]

@Diamondblade2006 yes!!!!! it would burn the phoshorus !!!!!! :)

[conoba]

Looks more like negative ions than electrons. I can see that there still is a lot of gas inside the tube. You could add a magnetic lens for focus and see if it gives a sharper image.

Good experiment, good work!

[kaiz88]

man this is cool

[ravaner]

Hello Nyle,

Could you explain whare are your electrodes ?Cathode is probably inside the small glass tube, but where is the anode ? Is it wound around thi small tube ? Best regards.

[conoba]

It is a cold ion discharge that utilizes the rest gas inside the tube. Ions behave a kind of like electrons when the mean collision path length is below the dimensions of the tube. His ion source is a pointy tip inside a metal tube, I guess.

[JarcoSOAD]

wtf is a cathode ray? lol. i just looked it up 4 sum reason. i obviously arnt smart as all u scientists here :) lol.

[halowow]

its what J.J. Thompson used to figure out more on atoms he put a magnet on top and notice something i dont remember soz

[onlyinternet]

its DANGEROUS cause it leads to X-Rays!

[webmasterec]

Not much danger involved; there might be some X-Ray production from the glass, but the voltages involved are probably so low that it's insignificant. You'd see alot more green fluoresence from the glass if there was significant X-Ray production

[damusician]

that is awesome! i want to see a homemade picture tube.

[zootsuit7]

You are a madder scientist than I! Cool tube.

[csingcsung]

Beatiful.

Please, mr Steiner can you tell us how many volt is on the cathode ? Any heating ? The electron gun is only 2 wire ? I make oscilloscope, but some problem with hotcathode. Maybe coldcathode is working.

[seneca67]

Could this technology be used to render images of attractive women in scanty garmets someday? I am giddy with excitement.

[DrMario2007baka]

Interesting, regardless of X-ray emission... I found that you can paint the TV image using ARM microcontroller - of course, the picture looks better in 32-bit mode. You simply just use PCM or PWM signal and 60Hz scan - you're ready.

[polytope13]

How can I make this? Are those rare earth magnets? If not, have you tried rare earth magnets on this thing?

[micromega11]

how did u remove the gases from ur CRT?

[unimatrix666]

thats well built heres a question for u i have a liquid neon what is like a neon looks like lightning in a tube well is there a way i can make it sound active ? because i know i can make a standard L.E.D flash by wireing it upto my sub speaker and everytime the sub kicks in the led flashed but when i tried wireing up the liquid neon to it well it didnt work is there a way round this?

[carmine440]

You are such a smart man, that I shouuld like to let you marry my daughtefr.

[cumesoftware]

What kind of picture valve did you used? Is that tube homemade?

[pinkstarchicken]

speechless

[gavincurtis]

It would be great to see a TV image projected onto your tube.

[synthmonger]

Pretty dang cool!

[bitRAKE]

Cool, thanks for sharing.

[HizerKite]

Wow, very impressive, what was the output transformer voltege?

[RotogenRay]

Splendiferous.

The coil deflection was really cool.

[RETROTHINKING]

Fantastically done, great work.

[jamtheman188]

Wow, that was pretty cool.

[neutron7]

Very cool! whats the electron gun made from?

[martialdrake]

Most excellent.

[thekanester]

Fantastic!

[Gomezcaline]

Good work. Did you use zinc sulfide for the phosphor coating?

[nylesteiner]

Just used phosphor powder, from a broken fluorescent light, mixed with water and applied to the glass surface.

[retsaoter]

@nylesteiner Bad for the environment but great for science. Thanks for the display.

[cheery314]

@nylesteiner

Umm... Don't those have mercury in them?

[rockman378]

@cheery314 as in the lights yes

[yoonoose]

superb!

[digitusmaximus]

Excellent, especially the Lissajous figures with the electromagnets. I love this type of stuff. Was this a school project, or are you a mad scientist? :)