Flat CRT experiments and waveforms
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- Опубликовано: 24 окт 2022
- Powering the monitor from the video door-phone with a flat CRT tube. Some experiments with the adjustment potentiometers. Then showing some PAL video signal and deflection waveforms on my oscilloscopes. Also measuring the heater and grid voltages.
The previous episode - visual inspection:
• Video door-phone with ...
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Very good explanation of CRT signalling. It's neat how they were able to flatten the tube for this application. Thanks!
They didn’t do it for intercoms. Sony introduced this type of tube in 1982 with the first Watchman (their pocket TV line). Intercoms and whatnot came later as a repurposing of the technology, mostly after pocket TVs had switched to color LCDs.
@@tookitogo ⚠️ God has said in the Quran:
🔵 { O mankind, worship your Lord, who created you and those before you, that you may become righteous - ( 2:21 )
🔴 [He] who made for you the earth a bed [spread out] and the sky a ceiling and sent down from the sky, rain and brought forth thereby fruits as provision for you. So do not attribute to Allah equals while you know [that there is nothing similar to Him]. ( 2:22 )
🔵 And if you are in doubt about what We have sent down upon Our Servant [Muhammad], then produce a surah the like thereof and call upon your witnesses other than Allah, if you should be truthful. ( 2:23 )
🔴 But if you do not - and you will never be able to - then fear the Fire, whose fuel is men and stones, prepared for the disbelievers.( 2:24 )
🔵 And give good tidings to those who believe and do righteous deeds that they will have gardens [in Paradise] beneath which rivers flow. Whenever they are provided with a provision of fruit therefrom, they will say, "This is what we were provided with before." And it is given to them in likeness. And they will have therein purified spouses, and they will abide therein eternally. ( 2:25 )
⚠️ Quran
Haha putting your fingers in the picture and looking at the signal on the scope, did that as a kid. Fun times. I remember saving for my first DSO, only to keep using my old analog scope once I could finally afford one. Nothing beats a good old analog to do troubleshooting. Nice visual on how interlacing works 👍🏻
Very interesting!
Analog cameras and monitors are actually quite impressive - the high precision and timing of the signals needed for it to work.
I completely agree, The ability to take all those signals and make a clear image and only 1 small microchip is so amazing. Really gives me some appreciation for those engineers back in the days..
@@sortofsmarter Not really, B/W TV sync & ramp circuits were impressive in the 50’s-60’s when the technology was new. In the 1980’s, when this chip was designed, it was amazing to see them minituarized to the point where only basic amplification was neccessary to drive a CRT using this chip. This is why it was in most B/W video monitors back then, before OSD and digital controls became commonplace. By the 2000’s, we already had decent digital cameras, color handheld consoles or MP3 players, all with circuits just as small and orders of magnitude more complicated.
That is not to say that the CRT itself is not black magic, and generating suitable keystone & dynamic focus waveforms with a few analog components is a notable achievement too. I am also impressed by the minituare, low-power HV source.
So everything about this monitor is really amazing... just not the chip. It was on its way out by the 2000’s while discrete analog circuitry feels more timeless.
@@sortofsmarter In 60' , in TV set was about 10 tubes + CRT. All basic functions without chip. But reliability was low, power consumption was high. With tube color TV running no heater needed in room in winter ;-)
@@vaclavtrpisovsky Honestly, that it could be done with 1950s technology is less impressive than the fact that it could be -and was - done with 1930s technology!!
I'm just old enough to remember CRT displays, good times! Very nicely explained, thanks Dan!
It's a very long time since I saw anyone adjusting horizontal and vertical hold😁. The analogue oscilloscope output was amazing. In the 1960s, my dad used to rescue b/w TVs from everywhere. I spent many a happy hour srtuggling with vertical hold once the set had warmed up. I remember the dot that slowly faded when the set was turned off after the national anthem. Happy days
Nice man, your tv videos are some of my favourites of yours. It’s good to have something I grew up with demystified
I hope you’ve seen him watch _The Ring_ on a 8LO29M oscilloscope tube driven by a vacuum tube circuit. Not sure if he’s flexing his vacuum electronics skills or afraid of Samara exiting any bigger screen.
It's amazing how much engineering went into crt. I can't make a filter behave at all, or a serial port sync with bitbanging. I know doing stuff at home isn't the same as doing stuff in a professional lab. But still it's amazing.
Thanks!
Thank you ;)
Hej, first time I see you! After all those years... As allways we are imagining the persons different... hi.
Thanks for this interesting video.
My uncle had one of these in his apartment.
It was very similar but in a nicer package.
Better materials in the housing, and Headset.
At first glance I though it was a lcd. But tie picture was off. So I had to peak inside.
It is a tube.
And it was still in use 5 years ago when he passed away. The picture was quite good. Sufficient to see who is at the door.
Always enjoy your videos. Thanks and I hope they keep coming.
Whoever designed the interface with all those connections was having a laugh! Great demo as always! Love your осциллоскоп 😎👍
I'm learning about analog video at the moment and your oscilloscope "tour" of this TV was really useful.
classic composite video signals :) Always amazing on an analog scope, even more trippy if you include the Z axis input of the scope.
Needs more saaaaaalt! Great video as always, Diode!
Disappointed that you didn’t connect your AVR memory oscilloscope to it. The grid is a nice focus & linearity test, and if it turns out sharp enough, it may even become your favorite display for it instead of that SOMY® portable TV. You could even remove the audio section and build the scope into it.
Also consider adding standard jacks for power (& perhaps video) to make it more convenient (removing the need to use a variable PSU and twisting wires together).
Thank you for useful & interesting videos
The image in the oscilloscope of the things are the best ! wow so cool effect
Thanks for the nice video, love the fingering on the video signals 😄👍👍
Great video. Very well explained.
Those displays are EIA/CCIR but PAL and even SECAM can be displayed on such. Sony produced them as OEM units well into the late 1990s.
Good work man, thanks
I wouldn't mind seeing how the video output circuitry works in this. Also perhaps add DC restoration if it doesn't have it already. My old TV drives video into the CRT grid and achieves DC restoration essentially by having a diode between ground and grid, making the synchronization pulses always 0v at the CRT.
Actually it's more complicated than a diode. It's actually a clever circuit using a triode in cathode follower mode for DC restoration and at the same time working as a common grid sync separator.
vey interesting and educational. thankyou.
thanks for this video! I'm thinking of buying a second hand video-door phone and connecting it to a Raspberry Pi, to maybe make a little retro gaming unit
Muy bueno . Saludos desde Perú !
Fyi you can find the crt modules for them on their own on ebay, I know ali express had them for a short time. really useful. The older sony watchman pocket tv's used these flat tubes to start with then I belive it was samsung who made them too, could be wrong. great video
Very cool, thought we were going to get a face reveal
He did in the thumbnail
This composite signal is like understand a black magic and become the magician. I wonder how it worked while sending TV signals to entire town some 30 years back (terresterial TV transmission).
i some days ago get the same model, very cool thing
Very Interesting and nice
Very good!.
Brilliant !!!!!!!
Very good
Thanks for the trouble to make these cool videos! I have a similar video phone with its manual and I think a circuit diagram. I can look for the documents, scan and send if that will be helpful.
very good
Had a Sony Watchman around '85 that used a similar CRT.
Brilliant I got a old portable b&w TV that takes D cells have to use a TV transmitter or something
Please connect cinch input and test some kind of signal from set-top box or computer :) this will be cool... i have the same monitor in my workshop and this is what I want to try when I find some time :)
Good effort! A journey into the past. I just love to look at your Russian Oscilloscope. According to Rossmann law a picture of your cat is missing!
Face reveal!!!1!!
Just kidding, it's just a premiere on this channel (see links in video description)
i might be mistaken. but i think dis guy has awebsite with his face somewhere.
Please hook up a Raspberry Pi and display a terminal through the composite output. All Pis have one !😊
Niiiice!
Perhaps try to rotate the deflection coil slightly to fix the downhill issue.
wow where did you get this type of phone with a crt screen i haven't seen it before
Can you explain why my tiny crt from a vhs video recorder not picking up the video signal that come from a hdmi to rca converter, but the tv picked up that signal just fine?
Crazy Professor poking around 1K! 👀🤣
Regarding the fast CRT warm up time, it could be that it has a directly heated cathode
Yes, it has. It only has heater terminals and grids, no separate cathode terminal.
Hey i know this might not be the correct video to ask you, but i just saw one of your older videos where you opened a NI-MH AA Battery charger and in that video you also showed a Sony Cycle Energy charger. I actually have that same Sony battery charger and just a couple of days ago it suddenly stopped charging my batteries.
I dont know much about electronics but with what ive learned watching your videos i think i know what the issue is. I opened the charger and in the beggining of the circuit next to the prongs that connect to Mains there is a component that ive heard you call a Fusible Resistor and it looks burned and has a tiny crack in the middle. Everything else in the circuit after this component looks fine.
Again sorry to ask you but how can i buy that component. Do i look it up as a Resistor? Do they have a certain rating?
TV is such a lost art....
So not only a cat but even a dog! Is it new?
Ten výstup z té kamery je kompozitní video?
Protože pokud jo tak bys to mohl zkusit napojit na normální monitor.
How did you measure those voltages (1000V) on the oscilloscope? Did you use a HV probe?
Yes, I've used a X100 probe up to 2kV.
I think that reverse engineering is a good idea. It's simpler than a regular color crt monitor
👌👍
👍
Is it possible you reverse engineer it this module? I have perfect learnt reverse engineering after years of watching your movies.
I like how he speaks like a vampire
Is this CRT PAL or NTSC?
👍🏼👍🏼
cooool
Is the guy in the thumbnail is " Diode " Who is gone wild...and doing Electronic surgery..
Still not on odysee ?
Ma parla in corsivo?
your video is not on Odysee yet
You can get these pretty cheaply off aliexpress, assuming you really wanted a low-quality monochrome CRT that goes wibblywobbly if you breathe within 20 miles of it... :P
This camera has fast frame rate. Find that in today low cost cameras xD
I have a idea 🔥
You can Turn this into Oscilloscope
4:39 - aaaaaahhh
The deflection coil appears to be turned to the right: ruclips.net/video/l9CXZXSwG7I/видео.html
Why when you explain you sound like you are singing? But good video ☺️
Power supplyyyyy...
Hello 👋🙂
Thumbnail image looks like Lenin XD
12.6 volts at 1 amp would net you better image control
Ty jsi čech ne?
Prefer the dog over the crappy crt 😅
Cool video! Adrian's Digital Basement reviewed a similar unit v=8cU9x23w4YE
Fingers on an oscilloscope
you cant see this every day
Face reveal????????????????????????????????
Man can you do an analysis of Intel Arc A380 gpu
The pcb got some empty places maybe it can be modded with adding missing components
But Intel arc gpu is really hard to get/find or the price a bit overly esp. with import/vat taxes
In US it's 140 dollars, in germany +180 euros if available
you're on the wrong channel bro
@@Basement-Science why?
when elecricity advanced it became electronics, when electronics advanced it became computing, when computing advanced it became information.
All relative subjects based on each other
EE + C + I = the current platform your chatting with me on
@@igrewold So? This channel doesn't deal with every niche of electronics-related stuff. You wont find a single video about modern computers on this channel. Why would you expect him to make a video about this?
If you wanted to know what those empty component positions are for you're asking the wrong question. If you're looking for a channel that might do a video like that, I would suggest @Actually Hardcore Overclocking.
Intel GPU? Verdict: Dodgyyyy!
ofcourse, reverse engineering it.
What kind of accent is this ?????????
No cat on the CRT, boohoo.
Excellent explanation,
If your English was better, the explanation would be more excellent!
Thank you for this clear presentation
Always good to be complaining about not so great english, while making a grammar mistake. If your english was better,...
Also he has gotten much better.
@@fabianbohnert120 Thank you for helping me rectify my grammar mistake.
And, I will pay more attention to my English when I make a technical RUclips channel, which I don't have now.
I will learn electronics from you, and English from someone else. I need two trainers for this.
Thank you again for your excellent presentation.
@@abdeljalilbouallegui3776 I don't think its bad if someone can't speak or write it that well. And typically don't point out mistakes. I just wanted to point out that irony.
I think its good if everyone just tries as best as they can.
The CRT Is Not Actually Flat, The Mirror Is Not Even Flat On What Its Projecting, LOL ! :D Title Misleading, Demonitized And Striked ........ !!!!!!!!!!!!!!!!