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Forum Index : Microcontroller and PC projects : Half inch CRT....
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Grogster Admin Group  Joined: 31/12/2012 Location: New ZealandPosts: 9610 |
Stumbled across this video today: Half-inch CRT The smallest one ever made commercially, so they say. 13mm or so diagonally. Smoke makes things work. When the smoke gets out, it stops! |
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Azure Guru  Joined: 09/11/2017 Location: AustraliaPosts: 446 |
Nice video. He seems to be very carefree about where his fingers touch, holding the sides of the PCB around the EHT section is asking for a little tickle  |
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| Grogster Admin Group Joined: 31/12/2012 Location: New ZealandPosts: 9610 |
Yes, I was going to comment as much, but at one point near the end of the video he does acknowledge that there is HV around there. He said 5kV or so, but yeah - I agree with ya - I'd be a little more careful around any kind of LOPT.  Smoke makes things work. When the smoke gets out, it stops! |
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| WhiteWizzard Guru Joined: 05/04/2013 Location: United KingdomPosts: 2944 |
At 4:38 in the video he says it takes .1A, so with a MM drawing 30mA (ish) these two could solve the USB current 'concerns' being discussed on the other thread!  Without a magnifier, what possible application could one of these be used for? |
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| Azure Guru Joined: 09/11/2017 Location: AustraliaPosts: 446 |
Well, in their day as a viewfinder, where your eye was very close to the screen they were useful (not sure about radiation effects on the eye) until they gave way to LCD's. Other than that they would be a great monitor on a machine just as an indication of what video is coming/going. They could be replaced by an LCD but if you were trying to see the actual scan without conversion they would be ideal. Great for some retro test equipment. |
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vegipete Guru Joined: 29/01/2013 Location: CanadaPosts: 1132 |
Watch the movie "Brazil" to see the correct use for small screens. Visit Vegipete's *Mite Library for cool programs. |
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MicroBlocks Guru Joined: 12/05/2012 Location: ThailandPosts: 2209 |
A Maximite with composite video output would be a great match. Microblocks. Build with logic. |
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mikeb Senior Member  Joined: 10/04/2016 Location: AustraliaPosts: 174 |
I often used to look at colour television receivers, and laugh, when people used to refer to them as being 'solid state'. Could they not see a bloody big vacuum tube in front of their eyes ? This small CRT is cute, in a retro sort of way, but oLED technology s**ts all over it. Must admit, the build quality looks pretty damn good judging by the photos. I would rather get bitten by the EHT supply in this little puppy than the 3-4 joules available in a disposable camera flash supply. Imagine getting across a capacitor (approx 150uF) charged to something like 200V DC. People never gave them a second thought cos' they were powered by a 1.5V battery.  There are 10 kinds of people in the world. Those that understand binary and those that don't. |
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| Warpspeed Guru Joined: 09/08/2007 Location: AustraliaPosts: 4406 |
You would need to look through something like a stamp loupe to view it, as otherwise you just cannot focus on something placed so close to the eye. But it can then be very effective, it can pretty much fill your range of vision. A long time ago I played around with night vision image intensifier tubes which are not that much larger. Cheers, Tony. |
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