Hello danyk ! I'm a big fan of your TH-cam channel and website. Can you please make a video about yourself to tell which education you've got and which jobs you was working. I'm just finished electrical engineering studies and looking for a job in the power electronics field. Your videos are really helpful and enjoyable to watch, and I'm sure if you will share your story it will inspire a lot of young engineers. Thanks a lot !
my gosh, so many technology into these CRT stuff, always make me think of how much experimentation and error the first tv had in order to become usable and commercially available. Also loved your tray of capacitors 4:24 and transistors 7:08, that may explain what you did in your formerly free time
TVs evolved over time. The first sets had very small tubes. So over time as the TVs became more powerful I guess they could figure out what they needed to do in order to increase performance. It was an iterative process.
@@1pcfred True, monochrome sets are very simple, as the standard put the most complex parts in the transmission side. Inverted video, so the noise would show up mostly as black and not peak white, and simple oscillators that were phase locked to the transmitter, and slow capture rate to make noise not show as jitter. Also sound on a defined subcarrier, so recovery was easier, and far enough away to both not get sound on vision with loud sound, and no vision on sound buzz with fast changing scenes. Well in the most part, but the early ones, with no ceramic filters or SAW filters, you always had a compromise, but it worked well enough, with just a single LC trap in the right places. Telefunken experimented with getting the tube count down, putting multiple stages, complete with the resistors and mica capacitors, into the same glass vacuum envelope, but they ran into issues with this, low pressure meant lots of arcing, and they were hard to manufacture. But they did make sets that were only 2 or 3 tubes total, with one doing the RF, IF and sound all in a single glass envelope, and the others doing the rest of the set. But they gave up, too expensive to manufacture, and too high a reject rate.
@@godfreypoon5148 there's a lot of cleverness going on in those smaller things. That choke with magnets I'd have never come up with something like that.
Room enough to build your Atmel scope into the case though, as you should have enough spare current in the power supply to do the 100mA it needs. Remove tuner, make it fixed tuning, and you will have room to put the switches into the hole, or simply remove tuner altogether and build a buffer, to provide the inversion and voltage gain, to drive the video and deflection circuits. At least you will get a higher bandwidth on the display, sharper edges as there are no tuned circuits to slow them down.
16:47 Apparently DiodeGoneWild is such an electronics god that he can build RF circuits on a crappy breadboard and it still works. He didn't get the memo not to do so ;)
I know of a small German YT channel who commonly does so, too. Besides, I like to build them right in mid-air, just soldering the components together, without a board or anything.
Here 24GHz sine wave oscillator on a breadboard (his DMM tests like 15kV transients are even more interesting):: th-cam.com/video/yR9TweWf3w8/w-d-xo.html
@Michael Bishop He explains it in the video - exploiting the aliasing phenomenon, armed with a 50 fps camera with very high shutter speed (1/16,000 s - that's faster than one scanline of the TV which takes 1/15,625 s) and with the knowledge that the 50 fps in the camera doesn't exactly match the 50 fps on the TV. What we see in the video is the slight difference in frequency between the camera and the TV, as in each frame the camera catches the electron beam of the TV in a slightly different position.
I once talked to a repairman who said getting 240V mains through the fingers was an almost daily routine. But he once got shocked from a TV HV. He said he had to sit down and breathe for 15 min then.
Once I did not discharge the tube completely (there was arcing but I did not fully touch the terminal) and I can attest that it is a mule kick. My arm became numb for a few minutes.
Awesome, Great job and great explanations, I wish to see a real video on that CRT TV to remember the old days and to see how the picture will look like.
That was incredible and educational! Thank you! A video about the humidifier would be great! I had one myself, the cheap version with a one-sided PCB even without soldermask. Humidity often gives short sircuit and it stops working, as it happened to mine.
In general, paper capacitors increase in capacitance over time. I have never seen them decrease (though perhaps that's a failure mode if it is metalized, self healing paper rather than the 'normal' roll of paper and aluminium foil). The increase in capacitance and leakage is because traces of acid in the paper, slowly break down the paper, making it thinner.
Yes, usually the leaky capacitors will show much higher capacitance. I recently measured some from the 1960s and they showed 4uF instead of 0.25uF. I read on some forum that you can "heal" the leaky paper capacitors by boiling them in hot wax for an hour, but this was meant for caps that were in metal boxes that you could remove the innards and boil it, not the sealed ones like in this video.
Another quirk, the USSR actually produced paper in oil capacitors that were hermetically sealed. They are in ceramic tubes with metal ends. I have few of them and they are still 100% perfect with no leakage even at 1KV, despite rated at only 600V and have datecodes of 1964 and 1965.
I would love to see you build a test pattern generator for an RF input to an old analogue tv. I have an old 24inch Hitachi colour TV that I would love to use as maybe a prop in my room where I want my computer, so to be able to send the TV signals would be awesome. It also has the remote and is TeleText FastText enabled to use the 'red green yellow blue' buttons. Something that could inject the required code into an RF signal so you could use/make custom Teletext pages would be even more awesome. I cant find anything on google but I bet you could whip something up in minutes :D I imagine an RF signal with a picture of your favourite fire extinguisher on screen then when you press 'Text' on the remote, Page 100 would have your logo and info displayed and maybe a crude TH-cam logo in the middle and text asking to subscribe. No idea how Teletext worked but Im sure you could figure it out :) Much love, JP x
I'd love a video on TV modulators. Your simple design has no sound... Would be interesting to see you go through all the steps to suppress left sideband, harmonics, make audio sub-carrier, impedance match the stages etc
Awesome video ,Please do make a video about analog tv signal generators (its a very convoluted topic) it would be awesome to see more details of your atmel oscilloscope too ,tnx
There is actually still analog TV broadcasting in exUPC (newly Vodafon) cable tv in Prague, Brno and other locations (or were), just a few channels form ČT, Nova, Prima and Barrandov. I checked it a year ago, so Vodafon migh've turned it off. Also there is this Litovel area that have (had) still big analog TV list due to technical reasons. Some info I noted in 2019: "V roce 2018 začalo postupné rušní analogového vyílání. Analogová nabídka MINI obsahuje cca 15 tv kanálů, kmitočty a jejich skladba se mírně liší dle lokality, vysílá se v pásmu VHF a UHF. V některých lokalitách, kde není dostupná nabídka digitální televize, je nabídka analogové televize širší, o nabídku A-Klasik. Kromě TV kanálů jsou v síti UPC šířena i analogová rádia v pásmu FM. 25.9.2019 bylo oznámeno zrušení monoskopu."
It would be good to have a video about which capacitors to use and why? When a polypropylene is better than a polyester and why to use mica not ceramic..............
Hi mr. Gone Wild :p, I repaired same tv set earlier and was looking for some kind of device to make so it turns this tv into low-end oscilloscope. I found points where I could feed composite video (I made actually AV input). This little device of yours is just what I was searching for. It would be great to make propper video on how to turn tv into low-end oscilloscope, not rubbish like playing with audio amplifier on deflection coils. If you could answer me at least is it possible to program atmega88 with arduino uno platform? Thanks. Have a nice day.
TV channels 4 and 5 are also overlapped with FM radio (85.25+91.75 Mhz, 93.25+99.75 MHz). TV channel 3 same as Chinese TV channel 4 and US TV channel 5 (77.25 MHz video, PAL/SECAM-D/K system sound carrier of 83.75 MHz, 81.75 MHz for system NTSC-M, PAL-M, PAL-N.
Even replacing a silicon transistor with a random other silicon transistor in a horizontal output stage is often problematic. The transistors are quite specialised and often driven hard but not into saturation or are forced out of saturation by a negative pulse. Too little or too much drive results in high losses.
I was always worried even about getting closer to powered-up CRTs exposed in an electronics repair shop I used to do some jobs at 15 years ago... I helped the older experienced guys into getting service manuals and stuff like that, but never ever touched those scary anode cables.
i hacked a old BUSH B/W television to use composite signal just by seeing which ic is the signal ic then seeing its data sheet i soldered it in a horrible way of course ; > love from India
why with wet hand if you touch the screen after screen turn on and turn off its shock me very2 hard :( , with dry hand its like static discharge to my hand.
Skin resistance, with dry skin the charge built up on the glass slowly is discharged through your skin resistance, around 100k, with around 50pF charged to 10-25kV from the electron beam hitting the other side. Wet skin around 100R or less, so the same charge is now going to go through 1000 times faster, giving you a shock.
It's not a high voltage TV, it's only 12v. Everything will be safe to touch inside except for some of the deflection circuitry. That happens to be exactly what he is touching, but I figure he knows it is safe. On most modern TVs the flyback primary is on the transistor collector, which is often connected to the heatsink. So if you touch one of those you could get a shock. I've been working on an _old_ TV which runs on around 400v. I'm a bit more careful playing around in that than I would be in a 12v unit.
@@eDoc2020 But for CRT to operate properly, you need several kilovolts on anode. Up to 25 kV if I correctly remember. Also high voltage on the other outputs of flyback transformer.
@@ShaLun42 True, but the real high voltage output is well identified and well insulated. Obviously touching random things in an unknown set is a bad idea but our host seems well-versed in this one's operation. Heck, the antique TV I'm working on runs at ~400v total B+ and I still poke around a bit in it when powered.
GOD, DANYK, ALL THE OLD CAN TRANSISTORS YOU HAVE. I'D BET SOME OF YOUR PATRONS WOULD LOVE SOME OF THEM. IF EVER YOU NEED TO DE-CLUTTERING YOU SHOULD GIVE SOME OF THEM AWAY IN A COMPETITION, (OF COURSE YOU SHOULD JUST GIVE SOME TO YOUR PATRONS FOR FREE) BUT HAVE A COMPETITION WHERE WHO EVER COMES UP WITH THE BEST COMMENT OR JUST SOMETHING AS SIMPLE SAYING IN A COMMENT "GIVE ME A TRANSISTOR" TO ENTER. AND PICK OUT OF A HAT! ANNOUNCE THE WINNERS AND IF THEIR WILLING TO PAY THE SHIPPING FEE (WITCH YOU'D BE SURPRISED HOW MANY WOULD PAY) THE BINGO. OF COURSE I BET YOU HAVE SOME REALLY REAR ONE'S IN YOUR COLLECTION TOO. (HOPE YOU CONSIDER MY IDEA SOMETIME IN THE FUTURE) ITS A GOOD WAY TO DE-CLUTTER.😀
@@DiodeGoneWild Probably each factory that made the sets had a hand copied schematic, same set, same parts from the same big state component makers, but they each had to draw their own schematic to assemble the set, as the original one likely was wanted by the first factory, and they had no Diazo copiers around to use, unlike the west, where pretty every factory had them. USSR had plenty of draftspersons though, so they simply spent a few days making the copies on a drawing board.
@NGC 253: Of course, there were no CAD schematic programs back then. On my very first job I also had to hand-draw circuit diagrams of the products we had there.
I bet you were pissed off when tube tech went away.. not many knew how to work on them. I remember paying over a thousand dollars on a big ass tube tv.. weighed over 300 lbs .. and damn thing all the sudden released the vacuum in only a few hundred hours of working.. later i found out i could have fixed it with a vacuum pump and an oxy propane torch….
No, you couldn't, the phosphor would be blown off the screen by the sudden loss of vacuum. Even if by miracle it hadn't, you would be killed by flying glass when the 14PSI across an entire picture tube finds your propane torch induced weakspot...
I love how you simplify everything! Finally, someone to explain things without his audience falling asleep.
reply where
What's going on here?
@@ngc253 general Kenobi
Fantastic description of the linearity corrections in the H & V circuits!
Your explanation of how things work is excellent. This TV repair was most interesting. Thank you for the video.
Hello danyk ! I'm a big fan of your TH-cam channel and website.
Can you please make a video about yourself to tell which education you've got and which jobs you was working.
I'm just finished electrical engineering studies and looking for a job in the power electronics field.
Your videos are really helpful and enjoyable to watch, and I'm sure if you will share your story it will inspire a lot of young engineers.
Thanks a lot !
I waited for this restoration
I really liked this series!
my gosh, so many technology into these CRT stuff, always make me think of how much experimentation and error the first tv had in order to become usable and commercially available.
Also loved your tray of capacitors 4:24 and transistors 7:08, that may explain what you did in your formerly free time
TVs evolved over time. The first sets had very small tubes. So over time as the TVs became more powerful I guess they could figure out what they needed to do in order to increase performance. It was an iterative process.
Like most things, it's merely a collection of smaller simple things.
@@1pcfred True, monochrome sets are very simple, as the standard put the most complex parts in the transmission side. Inverted video, so the noise would show up mostly as black and not peak white, and simple oscillators that were phase locked to the transmitter, and slow capture rate to make noise not show as jitter. Also sound on a defined subcarrier, so recovery was easier, and far enough away to both not get sound on vision with loud sound, and no vision on sound buzz with fast changing scenes. Well in the most part, but the early ones, with no ceramic filters or SAW filters, you always had a compromise, but it worked well enough, with just a single LC trap in the right places.
Telefunken experimented with getting the tube count down, putting multiple stages, complete with the resistors and mica capacitors, into the same glass vacuum envelope, but they ran into issues with this, low pressure meant lots of arcing, and they were hard to manufacture. But they did make sets that were only 2 or 3 tubes total, with one doing the RF, IF and sound all in a single glass envelope, and the others doing the rest of the set. But they gave up, too expensive to manufacture, and too high a reject rate.
@@SeanBZA they say black and white is a sharper picture. I don't miss old CRTs. HD LCD is definitely an improvement.
@@godfreypoon5148 there's a lot of cleverness going on in those smaller things. That choke with magnets I'd have never come up with something like that.
You should definitely do more CRT TV theory videos like this!
Room enough to build your Atmel scope into the case though, as you should have enough spare current in the power supply to do the 100mA it needs. Remove tuner, make it fixed tuning, and you will have room to put the switches into the hole, or simply remove tuner altogether and build a buffer, to provide the inversion and voltage gain, to drive the video and deflection circuits. At least you will get a higher bandwidth on the display, sharper edges as there are no tuned circuits to slow them down.
16:47 Apparently DiodeGoneWild is such an electronics god that he can build RF circuits on a crappy breadboard and it still works. He didn't get the memo not to do so ;)
I know of a small German YT channel who commonly does so, too. Besides, I like to build them right in mid-air, just soldering the components together, without a board or anything.
Here 24GHz sine wave oscillator on a breadboard (his DMM tests like 15kV transients are even more interesting):: th-cam.com/video/yR9TweWf3w8/w-d-xo.html
@@stanimir4197 Yeah that's nice and all, but I basically consider everything above like 100 MHz being witchcraft. You know what I mean?
@@theschnilser7962 >above like 100 MHz
So FM radio in Japan is all reasonable, but half of the international range is witchcraft? /s
@@theschnilser7962 no disagreement on the witchcraft part. Although Mr. Diode's version didn't reach 100MHz... so it's ok?
19:46 very cool budget-slomo! I already thought "how can he afford such an expensive camera?" :D
@Michael Bishop He explains it in the video - exploiting the aliasing phenomenon, armed with a 50 fps camera with very high shutter speed (1/16,000 s - that's faster than one scanline of the TV which takes 1/15,625 s) and with the knowledge that the 50 fps in the camera doesn't exactly match the 50 fps on the TV. What we see in the video is the slight difference in frequency between the camera and the TV, as in each frame the camera catches the electron beam of the TV in a slightly different position.
Niiiiiiceee
Oooh.... video(s) about TV modulators and signal generators would be FANTASTIC.
My new favorite channel. Hello to the Czech Republic from Australia :) You guys built my car, and it's awesome!
It is fascinating how those crt tv's have such complicated circuitry.
that one does look complex, looks all discrete, but many used ICs to reduce part count
you are able to present more information in a (relatively) short video, than my memory is able to hold in total!
Heyyy! I found this early on your "CRT tube devices playlist". Easter egg time! =D
Haha, you hacked DGW’s system.
I once talked to a repairman who said getting 240V mains through the fingers was an almost daily routine. But he once got shocked from a TV HV. He said he had to sit down and breathe for 15 min then.
Once I did not discharge the tube completely (there was arcing but I did not fully touch the terminal) and I can attest that it is a mule kick. My arm became numb for a few minutes.
great idea to use the brightness pot for on/off switch! Best "no spot" circuit ever! :)
Awesome, Great job and great explanations,
I wish to see a real video on that CRT TV to remember the old days and to see how the picture will look like.
That was incredible and educational! Thank you!
A video about the humidifier would be great! I had one myself, the cheap version with a one-sided PCB even without soldermask. Humidity often gives short sircuit and it stops working, as it happened to mine.
Nice. And the next project is to build an analog TV Transmitter for testing old TV...
Black magic . These old analog devices always Blow my mind
Thanks for this great series, more please!
Very good explained, thanks.
Loved the thorough series on this TV. Thanks.
😯 19:44 That was exactly my thought 😊 28:07 And a big hug for your DOG 🥰 Thank you Dany and stay safe!!!
anazing explanation of complex subjects
In general, paper capacitors increase in capacitance over time. I have never seen them decrease (though perhaps that's a failure mode if it is metalized, self healing paper rather than the 'normal' roll of paper and aluminium foil).
The increase in capacitance and leakage is because traces of acid in the paper, slowly break down the paper, making it thinner.
Agree.
В следствии деградации диэлектрика диэлектрическая проницаемость среды увеличивается, следовательно и ёмкость увеличивается.
Yes, usually the leaky capacitors will show much higher capacitance. I recently measured some from the 1960s and they showed 4uF instead of 0.25uF. I read on some forum that you can "heal" the leaky paper capacitors by boiling them in hot wax for an hour, but this was meant for caps that were in metal boxes that you could remove the innards and boil it, not the sealed ones like in this video.
Another quirk, the USSR actually produced paper in oil capacitors that were hermetically sealed. They are in ceramic tubes with metal ends. I have few of them and they are still 100% perfect with no leakage even at 1KV, despite rated at only 600V and have datecodes of 1964 and 1965.
I heard they burn out part of foil when electrical breakdown happens, and still work.
Excellent video, made me miss old black and white CRTs !
Please, Diode, could you explain complete schematic and how Crt tv works
3:37 Their symbol for their capacitor is a shorted capacitor...
A good omen, surely.
or one turn inductance in resonance circuit )))
Its a logo of some capacitor factory
Obdivuji tě, že věnuješ tolik času zprovoznění takového starého střepu. Ale každá práce, když se povede, tak potěší. 👍
What about making a better analog TV modulator and explaining it's blocks?
7:51 thats how you know that he is experienced, he is sticking his hands into that running high voltage power supply with no doubts!
He smart about electronic theory .. good job
Wish I had this video when attending the television classes back in the university
Idea for next video ? Comparsion between black & color TV circuits :)
I would love to see you build a test pattern generator for an RF input to an old analogue tv. I have an old 24inch Hitachi colour TV that I would love to use as maybe a prop in my room where I want my computer, so to be able to send the TV signals would be awesome. It also has the remote and is TeleText FastText enabled to use the 'red green yellow blue' buttons. Something that could inject the required code into an RF signal so you could use/make custom Teletext pages would be even more awesome. I cant find anything on google but I bet you could whip something up in minutes :D I imagine an RF signal with a picture of your favourite fire extinguisher on screen then when you press 'Text' on the remote, Page 100 would have your logo and info displayed and maybe a crude TH-cam logo in the middle and text asking to subscribe. No idea how Teletext worked but Im sure you could figure it out :) Much love, JP x
Love the accent.
That scope looks pretty ancient...
Source code in assembler?!
Maniac.
I'd love a video on TV modulators. Your simple design has no sound... Would be interesting to see you go through all the steps to suppress left sideband, harmonics, make audio sub-carrier, impedance match the stages etc
Awesome video ,Please do make a video about analog tv signal generators (its a very convoluted topic) it would be awesome to see more details of your atmel oscilloscope too ,tnx
O lot of knowledge, niiice!
Everything in made in USSR is made to last forever!
Except communism...
We would like to see some modern russian electronic circuits and components. .... TV sets, PSU .etc Thanks. As usual, nice vid.
Can we convert a CRT TV to a DSO (OSCILLOSCOPE)?.
OR How to controle the horizental and vertical cursor ?
Thanks .
There is actually still analog TV broadcasting in exUPC (newly Vodafon) cable tv in Prague, Brno and other locations (or were), just a few channels form ČT, Nova, Prima and Barrandov. I checked it a year ago, so Vodafon migh've turned it off. Also there is this Litovel area that have (had) still big analog TV list due to technical reasons.
Some info I noted in 2019: "V roce 2018 začalo postupné rušní analogového vyílání. Analogová nabídka MINI obsahuje cca 15 tv kanálů, kmitočty a jejich skladba se mírně liší dle lokality, vysílá se v pásmu VHF a UHF. V některých lokalitách, kde není dostupná nabídka digitální televize, je nabídka analogové televize širší, o nabídku A-Klasik. Kromě TV kanálů jsou v síti UPC šířena i analogová rádia v pásmu FM. 25.9.2019 bylo oznámeno zrušení monoskopu."
What happens if you can't get a jerainium transistor, and have to use a modern one, how would you go about that thx
It receives some radio! Mad.
even with breadboard you have nice component placement, some day maybe you will make video about programming atmel avr without arduino ide :)
This is pure black magic.
Very nice video!
It would be good to have a video about which capacitors to use and why? When a polypropylene is better than a polyester and why to use mica not ceramic..............
Next episode - let's adjust picture.
Maybe you can restore an old game console or a VHS player and use it test CRTs
I'm sure that piece of sh..t does not support PAL/SECAM/NTSC )))
@@thisone1697 Some VHS players and old game consoles have an RF output.
The Jack Russell looks just like my old dog 😢. Tikka was crazy but I miss her
Wait, the speaker stopped using the word «subsctructing» and switched to using «subtracting» instead?
Where is our old good DGW?!
i like this channel, techy.. super informative about electronics, I'm researching about my dell charger..on your other video about chargers.
Hi mr. Gone Wild :p,
I repaired same tv set earlier and was looking for some kind of device to make so it turns this tv into low-end oscilloscope. I found points where I could feed composite video (I made actually AV input). This little device of yours is just what I was searching for.
It would be great to make propper video on how to turn tv into low-end oscilloscope, not rubbish like playing with audio amplifier on deflection coils.
If you could answer me at least is it possible to program atmega88 with arduino uno platform? Thanks. Have a nice day.
This is my favourite electronics vlog.
My second favourite is shango066.
I hate that Australian with the shriek voice who is always pushing product.
Isn't the horizontal oscillator circuit not just a simple phase-locked loop?
More video how tv work! 🙂
Yeeeeessss, this is a great happy ending!
Where can I download the circuit diagram you're using in English.
28:43 That would be so cool :)
If you want to test it, come to Bosnia, there is still analogue television broadcasting ;)
Bosna obecana zemlja
TV channels 4 and 5 are also overlapped with FM radio (85.25+91.75 Mhz, 93.25+99.75 MHz). TV channel 3 same as Chinese TV channel 4 and US TV channel 5 (77.25 MHz video, PAL/SECAM-D/K system sound carrier of 83.75 MHz, 81.75 MHz for system NTSC-M, PAL-M, PAL-N.
Even replacing a silicon transistor with a random other silicon transistor in a horizontal output stage is often problematic. The transistors are quite specialised and often driven hard but not into saturation or are forced out of saturation by a negative pulse. Too little or too much drive results in high losses.
They certainly managed to make the screens very flat on their CRTs for their time
this is so cool!
Please buy DVB-T2 receiver with modulator. New are about 30€ , in Serbia at least
👍👍
Great video.
Спасибо
The pillow says "Happiness" in Chinese
Cool vid! Maby you could use it with VCR or old computer like commodore 64, spectrum etc😊❤️
So was this one originally designed to work from car batteries as well?
The capacitor icon on the Soviet capacitors look like cartoon mushroom clouds.
👍
Good!.
21:54 By the tone of your voice I somehow suspect that you are talking out of experience. 😉
I was always worried even about getting closer to powered-up CRTs exposed in an electronics repair shop I used to do some jobs at 15 years ago... I helped the older experienced guys into getting service manuals and stuff like that, but never ever touched those scary anode cables.
Is there anything that DGW don't know about electronics ??? ;-)
i hacked a old BUSH B/W television to use composite signal just by seeing which ic is the signal ic then seeing its data sheet i soldered it in a horrible way of course ; > love from India
why with wet hand if you touch the screen after screen turn on and turn off its shock me very2 hard :( , with dry hand its like static discharge to my hand.
Skin resistance, with dry skin the charge built up on the glass slowly is discharged through your skin resistance, around 100k, with around 50pF charged to 10-25kV from the electron beam hitting the other side. Wet skin around 100R or less, so the same charge is now going to go through 1000 times faster, giving you a shock.
Valeu!
7:52 oof, i would never touch anything in a high volatge tv when its on...
Right decision! Stay alive - don't touch that! )))
This gave me some ElectroBOOM vibes
It's not a high voltage TV, it's only 12v. Everything will be safe to touch inside except for some of the deflection circuitry. That happens to be exactly what he is touching, but I figure he knows it is safe. On most modern TVs the flyback primary is on the transistor collector, which is often connected to the heatsink. So if you touch one of those you could get a shock.
I've been working on an _old_ TV which runs on around 400v. I'm a bit more careful playing around in that than I would be in a 12v unit.
@@eDoc2020 But for CRT to operate properly, you need several kilovolts on anode. Up to 25 kV if I correctly remember. Also high voltage on the other outputs of flyback transformer.
@@ShaLun42 True, but the real high voltage output is well identified and well insulated. Obviously touching random things in an unknown set is a bad idea but our host seems well-versed in this one's operation. Heck, the antique TV I'm working on runs at ~400v total B+ and I still poke around a bit in it when powered.
Did you study electronics when you were in Australia?
Please make a teardown of a music center
3 different oscilloscope is involved in this video
Ur cat think it's too complex
Video o RF modulátorech by mě velice potěšilo 🙂
4:01 This seems to be made in East Germany.
plwase make a crt service tutorial for us, diode sir.
I remembar the TESLA company, that made chips and components. I think they had integrated power amp chips.
Yes, apparently they did. I have one here, an MDA model of some sort, I don't remember the number.
can hook atari commodore pong game nes dendy all console with rf modulator
Capacitors are like politicians, sometimes they work but they mostly fail
GOD, DANYK, ALL THE OLD CAN TRANSISTORS YOU HAVE. I'D BET SOME OF YOUR PATRONS WOULD LOVE SOME OF THEM. IF EVER YOU NEED TO DE-CLUTTERING YOU SHOULD GIVE SOME OF THEM AWAY IN A COMPETITION, (OF COURSE YOU SHOULD JUST GIVE SOME TO YOUR PATRONS FOR FREE) BUT HAVE A COMPETITION WHERE WHO EVER COMES UP WITH THE BEST COMMENT OR JUST SOMETHING AS SIMPLE SAYING IN A COMMENT "GIVE ME A TRANSISTOR" TO ENTER. AND PICK OUT OF A HAT! ANNOUNCE THE WINNERS AND IF THEIR WILLING TO PAY THE SHIPPING FEE (WITCH YOU'D BE SURPRISED HOW MANY WOULD PAY) THE BINGO. OF COURSE I BET YOU HAVE SOME REALLY REAR ONE'S IN YOUR COLLECTION TOO.
(HOPE YOU CONSIDER MY IDEA SOMETIME IN THE FUTURE) ITS A GOOD WAY TO DE-CLUTTER.😀
0:25 but maximum voltage !?
Yes, the max voltage falling is the main problem of capacitors that deteriorated this way. It is easier for them to arc over and become shorted.
8:36 unless it is a smart TV/games console/PC/etc.
9:36 is that scheme handmade?
the schematic symbols and text characters seem to be different every time, so probably yes, they just copied a hand drawn schematic.
@@DiodeGoneWild I see!!
@@ngc253 man when diodeGonrWild comment you know your day will be lucky
@@DiodeGoneWild Probably each factory that made the sets had a hand copied schematic, same set, same parts from the same big state component makers, but they each had to draw their own schematic to assemble the set, as the original one likely was wanted by the first factory, and they had no Diazo copiers around to use, unlike the west, where pretty every factory had them. USSR had plenty of draftspersons though, so they simply spent a few days making the copies on a drawing board.
@NGC 253: Of course, there were no CAD schematic programs back then. On my very first job I also had to hand-draw circuit diagrams of the products we had there.
Czech accent with english is crazy thing.
I bet you were pissed off when tube tech went away.. not many knew how to work on them. I remember paying over a thousand dollars on a big ass tube tv.. weighed over 300 lbs .. and damn thing all the sudden released the vacuum in only a few hundred hours of working.. later i found out i could have fixed it with a vacuum pump and an oxy propane torch….
No, you couldn't, the phosphor would be blown off the screen by the sudden loss of vacuum. Even if by miracle it hadn't, you would be killed by flying glass when the 14PSI across an entire picture tube finds your propane torch induced weakspot...