Video door-phone with flat CRT (pre-LCD tech)
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- Опубліковано 5 вер 2024
- What's inside a video doorbell intercom with a flat CRT screen from 2003. A flat display technology before LCD's. Warning: don't do what you see in this video. Risk of electric shock or injury.
The next episode - in operation, experiments, waveforms:
• Flat CRT experiments a...
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Good to see you're alive man, was starting to get worried thinking that Lidl took a hit out on you.
Lol
I would have first suspected those dodgyyyyyyyyy power supply manufacturers. 😁
LoL
🗿
Lidl got themselves a serious reputation of killing people. With their food that is.
Urmet is a quite big Italian company that makes door communication systems. One great thing about those systems (at least in Italy) is that they are basically unchanged from 30 or even 40 years ago. The interface is always the same, just the technology on both sides changes. In fact I think the outside unit you have is a later model and it's not made in 2003. The one you have is a one button outdoor unit, but you can have rows and rows of buttons outside a big residential complex. The whole system is wired in a relay box that switches all internal units to the one unit outside. Usually only the microphone is switched, so everyone can pick up the phone and listen to the conversations (and see who's at the door, and open it). You can extend the system to multiple doors, so that video, audio and the opening button is switched on the internal units depending on which door button you pressed. Of course 40 years ago there was no video, and that's why the system is modular. You can upgrade an old installation with a camera without changing much. Everyone in the building can decide if they want to keep their old audio-only unit or buy a new one. Of course, being all analog, systems from different brands are all compatible with each other. With a digital system this would never be the case. The system is powered with 24V DC, but since you can have very long cable runs, and large voltage drops, it is linearly regulated to 12 V to have a lot of buffer.
It's pretty cool. It's also probably rock solid. In Germany we have similar systems from Siedle. My apartment building went digital. Digital systems can also be compatible under each-other. If that wasn't the case you wouldn't even be able to watch this video and comment. But just after a few weeks the circuit board in my apartment unit died and had to be replaced. Capacitor installed backwards... This is when you assemble stuff by ultra low wage workers. They don't make stuff like they used to anymore...
Everyone went 2 wire BUS now. 24vdc with superimposed data. With a few exceptions such ad Siedle which runs the DC rails separately from data. Now more and more brands offer IP. Be it proprietary or SIP. For new construction i like IP more nowadays. Because the IP backbone can be used for other data such as KNX IP, all on the same backbone. Analog systems were pure terror in my opinion. The video coax and such was madness in huge constructions. I never installed these new, but did replacements or maintenance on them.
I'm starting to prefer when devices are damaged. Usually means you'll have to repair them and that is awesome to watch. Always a lot to learn xD
Very neat little trinket! I'd be tempted to stick the CRT display in a plexiglass case and see about getting a composite video input into it. Would be a lovely little display piece~
I spent few years in Praha, and I simply LOVE your videos - once because of the content but second because of your accent ;-)
Thanks!
The blue coil is called a saturable reactor. The permanent magnet can usually be rotated to adjust the saturation threshold. It is definitely part of the H linearity circuit. As the magnetic field in the coil turns more and more of the iron atoms into magnets, a point is reached where all the atoms are aligned. More current will no longer make the material more magnetic. The excess energy is then lost as a small amount of heat in the copper wire.
Nice to see you here.
I can listening to his accent all day long :D
Great respect to those analog engineers when working on projects like this flat crt 👍👍
In Operation Please! Fascinating CRT. I remember back in the day Clive Sinclair of Spectrum computer fame, producing a tiny telly with a similar type screen - much, much smaller though.
yep, it had its gun 'sideways', and was electrostatically deflected, not magnetic like this one, i have 5 of those tvs ,all with 'problems', most common issue was/is poor contacts to the 'flat' crt terminals, it was a problem when they were new
I have one like this made by Sony, FD-20A. its a "pocket" B&W 2 inch tv. It does the same thing with a flat screen crt. was made in the early 1980's. The keystone adjustment controls the trapezoidal look of the image..
yep sony 'watchman', i have one
Those little CRTs are very cute. Like a DAT recorder compared to a VHS VCR. 😁
Wow... I love this device.... Please don't forget to make the second part.. 🧡
Yes. He could without any doubt build a TV set or an oscilloscope out of it! 👍
I installed much of these urmet systems in dutch appartment buildings.
Older versions have a normal crt with a mirror above it.
2012 i installed the last crt version with a flat b/w crt.
I used one of these CRTs to build a mini arcade, it is a very attractive Sony CRT
My grandmother living in Iran had one of these. She got it around 15 years ago and it was working until 2-3 years ago. I don't live in Iran anymore, but wish i could get that CRT
12:32 Thanks Dany, very good explanation! God bless you!
6:11 First I thought you'd drawn your cat :)
kdysi jsem si z toho chtěl udělat přenosný hipster osciloskop, pořád na to ten interkom ještě mám schovaný :D
11:42 :D hahahah that "basicly" klilled me :D I love your videos! High voltage from Poland!
Thanks for this funny teardown. 😂🤣
"E.T. Home Phone!" 😂
Reminds me of the Sinclair (he of Spectrum fame) flat screen CRT.
This is basically the same type of CRT which was used in some Sony Watchman portable TVs.
Thanks
Neat little CRT dude 😮!!!
I had found on a flea market two units like that (the indoor side with the screen). I got them very cheap (5€ for both). I wanted to use one as a screen to a old 8 bit computer and another one as a screen for a B&W camera. Sadly, they were broken. One had a very distorted image and another was completely dead.
I found that that type of camera is sensitive to infrared and UV, not only from LEDs but also from natural sources. Try it to an hot stove that do not emits visible light or an solder iron in darkness.
On the one with distorted output, did you play around with the vertical hold potentiometer? With the one I bought, the vertical hold potentiometer was set to 50FPS, while I was feeding the screen a 60FPS signal
@@FerrybigGaming I remember trying all the pots, cleaning the board but no avail. The distortion was that the image was in some trapezoidal shape; now I guess that the small magnets that were around the tube`s neck were demagnetized. Otherwise, the image was pretty sharp and stable.
That's an interesting piece of old hardware. Must have been a fancy and costly thing back in its day
Nice sharing sir watching here sending full support thank you for sharing
Golmar used to use that same monitor, but it was named as "Platea"
Fajny materiał
I have seen arcade videogame machines that have a mirror in the back and a CRT mounted in the bottom part pointing up, so that the light hits the mirror and gets reflected towards the player. I expected this device to be built in the same way, instead of this incredible slanted angle CRT device. Probably this device is thinner than a similar device with a normal CRT and a mirror, anyway.
Interesting that this was made in 2003, I've seen older versions that already had those horrible CSTN-like LCD screens. It raises a question, why did they use that so clear phosphor for those B&W screens? Wasn't any darker version available? I mean, to increase picture contrast when the room ambient light is too high.
I believe the tint on normal CRTs is in the front glass so the wouldn't work as well here. Or maybe it's just because the CRT is too dim.
It's always great to see unusual devices and this one certainly is unusual. I've never seen a CRT anything like that before... I need to get some E. Bay searches set up.
Thank you sir, you are brilliant.
CIA camera? NIIIICE!!! ^^
Try to test that camera module with your crt tv it has av output at yellow wire of it.
You can use it with your diy tv transmitter circuit to transmit video signal and make it wireless security camera.
I had a Panasonic branded one that only used two wires between the base and the intercom part. I think it was made in the early 90s.
Very cool ! the alien tech haha
Haha in my appartment in the corrrupted Netherlands i have this thing
Alien technology, you say... Ask your local Goa'uld.
Very interesting CRT, and I like how all the HV and video circuitry was compartmentalized in its separate frame.
The way the voltage regulator's heatsink is installed is complete and utter rubbish. I don't know why they didn't just use one screw to attach the heatsink to the regulator, and another one for attaching the whole assembly to the PCB. Could be done using the same hole - just add a standoff...
Damn nice teardown!
Very nice little crt :-D
Clive sinclair made a small t.v with similar technology.
Then casio made a lcd tv and that killed the interest.
Casio made those TVs too, one was really small, maybe 1.5" and the other I guess about 2.5"
I bought one of the "larger" ones on eBay for €20 and it still works, although I don't know what the picture quality is like because it didn't have an RF modulator when I unpacked it, I just checked to see if it turned on like the seller had advertised and the I placed it on a shelf, the truth is that I don't care, I only bought it out of curiosity about the flat CRT, because it cost me less than one of those video intercoms that was where I had first seen those CRTs
Waiting for the second part
That thing must be Chinese made. When you was looking at the vertical potentiometers up top, the one that said k e y s o n e, was supposed to say keystone. Common misspelling by the Chinese when they label things. The Keystone of course you know is for the adjustment of the picture on the screen where you can make the bottom wire or narrower in the top wider or narrower.
Well seen :)
Hope it is not dead want to see it working
Reminds me of an old arcade screen for a light pistol game haha
I have a similar one, but with some noname chinese CRT. It has some horrible distortions, which they tried to correct by placing some thin magnetic strips between the deflection coil and glass. I bet this Samsung is much more nicer.
Veeerrry inteeressstingg
Interesting screen, thanks for this video. Hope you get it to work for another video 😊
this flat crt looks similar to the crt in Sinclair's flat pocket TV sold in UK
Real!.
17:20 Question is ...
Is it colored Ccd or b n w because in the end you only see b n w so no needs to use Color but if it's b n w you can see uv with it
he talks so veriiiiii funiiiii like from italiiiiii
i want to put a flat crt into a project that would be cool
Lol.
I look in the room.
And what do i see ?
Yes that phone in my house .
Lol stil use today lol.
Interesting
i have covid and my lungs hurt 😔
with how low my immune system is idk if I'll survive 😭
why does this crap always have to happen to me I'm only 17
but anyway nice video, i doesn't recall ever seeing such a small CRT tube!
I hope you get better soon ;).
are you vaccinated?
CIA camera 😆
Sinclair had an even smaller flat CRT for a tiny TV the developed.
I came here after trying to find out what type of screen these had. I remember seeing them many years ago and thought the screen almost looked like paper, due to the bending.
When someone rings my doorbell, I can only open the building's door while the camera is active, otherwise the person downstairs has to ring again. How can I disable this? How can I open the downstairs door whenever I want? Thx
Probably the lock is feed by the camera module to save on wiring... Is there no way to turn the camera back on? by pressing a button or lifting the handset.
I'm not an expert, I've only installed a couple of them to friends...
What's show on CRT if you can't place the lenses on photochip?
I want to see it working
Nice vidio
Funny enough, you can actually buy those CRT modules on eBay for around $25- $30 (USD).
What search terms do you use? :)
@@edgeeffect Try "Vintage Micro 4" Black & White Monitor CRT"
Urmet jest chyba polski o ile pamiętam dobrze.
I really like your acsent 🤣
So, just rear projection television in different form factor :)
You can buy that flat CRT on Aliexpress.
el mio tiene una franja vertical, como lo puedo corregir?
6:17 that looks like cat
Why do I like to see that junk being dismantled so much? well... It's because, surely I'm very nerdy. I could be seeing girls dancing in skimpy shorts, instead... I'm trying to imagine many uses for that beautiful crt monitor. I'd like to see it work. Thank you.😅
anybody know where I could get one of these?
That person is Czech. There is no mistake about it.
I'm shocked it's as recent as 2003.
About four or five years ago they still had them in some hypermarkets and DIY stores in Spain, although I don't know when they were made, they sold them depending on the brand (all unknown) between €35 and €50 for the complete kit with the internal and external units, a power supply and a roll of cable, I think they were 2-wire models.
Co takhle udělat české video? Když už jsme Češi.
Low Cost Flat Display.
Thanks!