here is another with spinning LED's Building A Mechanical Magic Eye <http://www.hpfriedrichs.com/radioroom/magiceye/rr-magiceye.htm>
On Thu, Mar 12, 2015 at 6:50 PM, Billy Watson <[email protected]> wrote: > here it is, on this web site, ~+~ http://www.magiceyetubes.com > ~+~ > left side of page index under eye relatives " The shadow > graph " > > On Thu, Mar 12, 2015 at 3:23 PM, Tidak Ada <[email protected]> wrote: > >> An easier way is used in the magic eye of the old radio my parents used >> in my early youth: >> It was magneto-mechanical and functioned at the way of an old >> galvanometer. The pointer was a diabolo shaped piece of shading >> (magnetized?) material. At one side there was an ordinary scale bulb and at >> the other side a greenish, frosted disc of glass with a black dot in the >> centre. The shade of the diabolo projected to the glass resembled the >> shade of an EM34. It could be a narrow line at maximum and a diabolo at >> zero. >> >> There must be a drawing , but I cannot find it at the moment. >> >> eric >> ------------------------------ >> *From:* [email protected] [mailto:[email protected]] >> *On Behalf Of *Dan Harboe Burer >> *Sent:* donderdag 12 maart 2015 20:06 >> >> *To:* [email protected] >> *Subject:* Re: [neonixie-l] OT: Do any "long-life" magic eye tubes exist >> ? >> >> I have another (crazy? wild?) suggestion: >> >> Go mechanical. >> >> See my attached picture. You should be able to simulate a magic eye with >> a couple of counter-rotating (bevel) gears with oval slots cut in them, a >> light source and some matt plastic or glass, behind them and a small >> (stepper?) motor to run it. It might even be possible to make this quite >> compact – in theory at least [image: Smiley] >> I would try to find nylon gears – they are easiest to cut in..but with >> access to “real” machinery it could look quite cool with brass gears.. a >> “steampunk” magic eye? >> >> Sorry for the primitive drawing. I just threw it together on my desk .. >> let me know if you want a more accurate description.. >> >> Regards >> Dan >> >> *From:* John Rehwinkel <[email protected]> >> *Sent:* Thursday, March 12, 2015 7:51 PM >> *To:* [email protected] >> *Subject:* Re: [neonixie-l] OT: Do any "long-life" magic eye tubes exist >> ? >> >> >> >> On Thursday, 12 March 2015 18:30:38 UTC+1, gregebert wrote: >>> >>> I did some research and found that common magic eye tubes, such as the >>> 6E5, have a pretty sort lifetime, maybe 1000-2000 hours. >>> Have any of you found round, end-view magic eye tubes with a >>> substantially longer lifetime ? >>> >> >> There are ways to increase the lifetime of these tubes. Normally they're >> operated at lowish voltage and high current, which rapidly damages the >> outer phosphor layer. However, >> they can be operated at higher voltage and lower current, leading to >> greater electron penetration and greater phosphor life. >> >> >> I spoke to a vacuum tube designer a few months ago, well into his >> nineties now, who told me the same thing. He told me that apart from the >> glow fading due to the material used to produce the glow many tubes had a >> problem with the cathode not emitting electrons as designed and expected >> which also led to less glow after some time. >> >> >> Running at lower current would also likely extend cathode life. Note >> that most eye tubes have a space charge grid around the cathode, which both >> limits cathode current and >> gives some interesting striations to the resulting glow. It would be >> handy if this grid were brought out to a separate terminal for greater >> control on emission. In most tubes, >> it's simply connected to the cathode, giving essentially zero grid bias. >> >> >> You MAY be able to obtain a one inch CRT and drive the deflection plates >> with appropriate signals and 'simulate' and eye tube. >> >> >> This is an interesting idea. Most of those one inch CRTs use an ordinary >> P1 phosphor (Mn-activated zinc silicate), which is a subtle variant on the >> willemite phosphor (Mn2+-activated zinc silicate) >> used in eye tubes. I'm guessing the CRTs have longer life because of the >> aforementioned higher voltage and lower current. Some CRTs use an >> aluminized screen to increase brightness and reduce ion >> damage, but I don't think any one inch units do. There are small CRTs >> with other phosphors, but they might not give the color you're looking for. >> >> Similarly, there are some eye tubes (generally those with the phosphor >> deposited on the inside of the glass like 6HU6) which probably last longer, >> but they too are generally a different >> (more blue) color. >> >> Another possibility is a vacuum fluorescent display. These use a >> different cathode technology capable of extremely long life, as well as >> different phosphors (zinc oxides and sulfides) optimized for >> long life at low voltage and modified for increased conductivity. >> However, they too are more blue than most eye tubes. >> >> Once upon a time, there were very high brightness green fluorescent tubes >> used for copiers and underlights for escalators. These had a double layer, >> of white paint and >> then green phosphor, along with a linear "window" where no phosphor was >> applied. These are capable of very long life, high brightness, and they're >> brilliant green. However, >> they're large, power hungry, and hard to obtain these days. However, >> there are small colored phosphor CFLs that give nice pure light. One of >> these might serve. >> >> There are also some Russian bulbs that work like the green NE-2 bulbs, >> but they're larger, about 1cm in diameter. Don't know about their lifetime. >> >> - John >> >> -- >> You received this message because you are subscribed to the Google Groups >> "neonixie-l" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to [email protected]. >> To post to this group, send email to [email protected]. >> To view this discussion on the web, visit >> https://groups.google.com/d/msgid/neonixie-l/68B2B1D4-04B1-4268-9B09-C17568AFA42C%40mac.com >> <https://groups.google.com/d/msgid/neonixie-l/68B2B1D4-04B1-4268-9B09-C17568AFA42C%40mac.com?utm_medium=email&utm_source=footer> >> . >> For more options, visit https://groups.google.com/d/optout. >> >> -- >> You received this message because you are subscribed to the Google Groups >> "neonixie-l" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to [email protected]. >> To post to this group, send email to [email protected]. >> To view this discussion on the web, visit >> https://groups.google.com/d/msgid/neonixie-l/4A912C36D3D149FA8E236CE40FE177B3%40DanDims >> <https://groups.google.com/d/msgid/neonixie-l/4A912C36D3D149FA8E236CE40FE177B3%40DanDims?utm_medium=email&utm_source=footer> >> . >> For more options, visit https://groups.google.com/d/optout. >> >> -- >> You received this message because you are subscribed to the Google Groups >> "neonixie-l" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to [email protected]. >> To post to this group, send email to [email protected]. >> To view this discussion on the web, visit >> https://groups.google.com/d/msgid/neonixie-l/!%26!AAAAAAAAAAAYAAAAAAAAAPDddShx705MuX20yCpp0vvCgAAAEAAAAJPFZk4cfkxAkAXd1ehv4iUBAAAAAA%3D%3D%40zeelandnet.nl >> <https://groups.google.com/d/msgid/neonixie-l/!%26!AAAAAAAAAAAYAAAAAAAAAPDddShx705MuX20yCpp0vvCgAAAEAAAAJPFZk4cfkxAkAXd1ehv4iUBAAAAAA%3D%3D%40zeelandnet.nl?utm_medium=email&utm_source=footer> >> . >> >> For more options, visit https://groups.google.com/d/optout. >> > > -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. 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