Hey everyone! Thanks for watching and all the comments. I wanted to make a post in regards to some of the common questions, and give a teaser for the follow up. I have put the original transformer back and and even applied 220V, no change. I used DC, no change. I replaced some components....change. I have a second unit now I am building with better components...stay tuned to see how that works!

@SP95

2 жыл бұрын

Good luck ! Thanks for keeping us updated

@eltrylogis

Жыл бұрын

Did you check the Voltage working, with signal? you transformer supply the current, and voltage ? You must chech all the capacitor have good values in every line of supply. Try disconnect the power supply line to IC audio D386 ?

@RetroTechorDie

Жыл бұрын

@@Blubbstock The algorithm has been very good to me lately!

@JamesCutlervk2tim

Жыл бұрын

I enjoy things like this! Hey, I discovered that my CRT has a 6.3V heater, but the FBT is putting out much less than that. I have a fix, and once I have done it, I'll make a video and post a link if that is ok.

@retroftw

Жыл бұрын

2023 will be the year this CRT kit is finally figured out 😉

Wow! Reminds me of those little black and white tvs you saw in the early 2000's. Maybe after they were unable to sell them to consumers due to the analogue shutdown, they had a bunch of parts lying around and decided to sell them as kits

@faustinuskaryadi6610

Жыл бұрын

You can still buy new CRT Analog TV in my country Indonesia, but mostly obscure local brand that use this kind of kit to produce new TV. We still have analog PAL broadcasting here because failed analog shut down this year.

@ElectronicInspiration

Жыл бұрын

@@faustinuskaryadi6610 wow interesting

@faustinuskaryadi6610

Жыл бұрын

@@ElectronicInspiration Even the obscure brands that I said are selling new CRT that able to receive DVB-T2 signal and stream KZread video (by adding USB WiFi dongle).

@ElectronicInspiration

Жыл бұрын

@@faustinuskaryadi6610 i wish they sold tvs like those in australia.. we moved to lcds very quickly and never looked back

@paradiselost9946

7 ай бұрын

@@ElectronicInspiration sad, isnt it? we used to believe in backwads compatibility, and now that ideas long gone... always amazes me the deal about colour transmission being backwards compatible to B&W... a standard we managed to maintain for approximately 70 years... old gerry harvey had some deal going, im sure..."gotta sell more TVs... maybe with that "cash incentive" krudd gave us all.... hey, lets remove the old analog transmission that even if its not the best picture, still works when the reception gets a bit lousy... take that away and theyll ALL have to buy one! think of the import taxes you can tack on to my $5 units! " i miss ghosts, ants, static. i miss being able to follow the storyline as the audio was almost always coming through strong, even if the image was disintegrating into mere shapes and shadows... and i could still tell what it was an image OF! "format not support" "no signal" were going backwards faster than were going forward...

I have one. Got it working. Much better image quality re full height an width. I did not use the transformer at all I power it purely with a wall wart. Ended up putting heat sinks on the vertical defection transistors as they were getting really hot. Felt like the coils and transistors were not a good match. CRT is dated 1999 if I remember. Plus I never got the speaker going but I can live without the sound. I love it because of the whole China TV feel of the kit. Use it for my ZX80/81 and pet clones.

@RetroTechorDie

2 жыл бұрын

I have a second kit on my bench right now, however I am replacing MANY of the components with quality parts. The vertical defection transistor really did need a heatsink!

The power supply voltage is too low, that's why there's a small raster with not enough width and height. And seems to be poor regulation as well. Suggest checking the voltage on the emitter of Q2(regulator transistor), it should be 10.8v. Also check the collector of Q2, it should be 12v or more. It might be the 110V VAC transformer you substituted, isn't providing enough voltage for the TV.

@RetroTechorDie

2 жыл бұрын

If I wasn't getting on a plane in a few hours I would be checking this right now.....As soon as I get back!

@newq

2 жыл бұрын

@@RetroTechorDie How'd it go? I'd really love to see this working!

@ComputerTechnic217

2 жыл бұрын

@@newq he forgot about it

@zsombor_99

2 жыл бұрын

Yeah, this thing acting like if the power is not enough! ⚡

@catwithangun

2 жыл бұрын

I just completed mine and it shows absolutely no signs of life other than Q2 and IC1 being warm and Q7 being scalding hot. I'm using the DC input jack instead of the transformer and it reads -11.5 at the base and ~-12.5 at the emitter (using the heatsink as ground).

For the small image, I noticed earlier in the video the yoke seemed to be pulled back. Assuming it's not glued, try sliding the yoke back and forth, that might make the image bigger.

@RetroTechorDie

2 жыл бұрын

The yoke shipped in that position, It was moved as close to the back of the tube as possible before power on.

@rennethjarrett4580

Жыл бұрын

@@RetroTechorDie I think that is the wrong direction to widen your picture with the yoke. Yes you power supply is to low. The amp need to be enough as well as the voltage. Check out shango66 KZread, he restores old TV's.

I bought one of these off Amazon. Pre-assembled and also with an AM/FM radio inside. I'm planning to remove it and install a Raspberry Pi. Weirdly, the TV works best with a variable power supply: "inShareplus 30W Universal AC/DC Adapter, Regulated Switching Power Supply, Multi-Voltage Adapter with 8 Selectable Adapter Plugs, 3V to 12V for Home Electronics, 2Amps Max" Bought another 12v PS for it and this one still seems more stable.

I built this tv last week, and get full size image. I think your AV source is NTSC, this unit is PAL D/K, so you got a “shorter” image.

I'm looking a years for a video from this kit provided from ZHONGXIA corporation from Wuhan, i'ts a brand that makes kit for teaching electronics at school and kits for technical schools. I want this kit but the problem is that is very expensive and the glass from the CRT can be breaked during the travel. A very interesting video. The image is very stretched in the screen, you have around 10,7 volts in the output of the main regulator in the power supply, the problem is that the manual is in Chinese.

The ZX2035 is $82 on the US site, and it retails for the equivalent of around $20 in China. So one can't expect much in the way of real quality here. It's made from 100% Chinesium. I'm pretty sure they're no longer made, and there's a storeroom full of the things that they're trying to clear out.

This is exactly the weekend soldering project I didn't know I needed :)

Man this sounds like a fun project!

@RetroTechorDie

2 жыл бұрын

It absolutely was! I am happy it "worked" I have another one on the bench now with better parts ordered from Digi Key... stay tuned for part two!

@3DSage

2 жыл бұрын

@@RetroTechorDie If there was one a little larger with color, I would consider building it for my retro video game consoles.

This is really cool! There was something different about playing video games on the old CRTs that just hits different!

I was waiting for someone to buy it and build it and put it on youtube.

@RetroTechorDie

Жыл бұрын

Wait no more! lol But please wait for part 2!

@adinko7

Жыл бұрын

@@RetroTechorDie OK

Nice touch with the piano tune, sort of nostalgic and the project.

Love the video. So tempted to buy one. I used to fiddle with my Dad's Sanyo 9" BW TV when I was a kid. It came with schematic so I was able to connect to a Nitendo and play games back then. got shocked couple times while playing with it :)

This is neat. I'd love a kit CRT that wasn't made from garbage components. I'm interested to see if you can get it working fully

@RetroTechorDie

2 жыл бұрын

I am seriously debating ordering another one just for the tube and flyback, and using better components.

Good Job, I'm delighted to watch that. Keep it up. God Bless You.

Wow! Thank you for doing this video, I'm so impressed by this project!

@RetroTechorDie

2 ай бұрын

Glad you enjoyed it!

For proper image sizing and alignment you're going to need to adjust the yoke which is a physical process, not an electronic one. The only shot I saw of your yoke was from just out of the package and it was just tossed on the tube unseated to park it somewhere. Once you get all the aligning magnets adjusted, use a little acrylic paint on them to keep them adjusted. To be an Apple repair technician back in the mid 1980s you needed to be a pro at the alignment procedure on 9 inch CRTs. Also: The original transformer has bell ends to shield the windings and I noticed your replacement transformer is unshielded. That will make a big difference with magnetic interference.

@RetroTechorDie

2 жыл бұрын

Good call on that transformer. I will source another.

I'd love to see a full recap, see how good this can look

It´s really good for training. Finally you have really your own and absolutely original TV. :-)))

Love the video! would love to see a rebuild with quality components just to see the before and after for comparison! Got your self a new sub! Cant wait to see further projects, i have a feeling your channel is going to go places!

@RetroTechorDie

2 жыл бұрын

Thanks for watching!

Thanks for sharing. Super interesting that CRT tubes (small B&W ones anyway) are apparently still being made? I wonder what the quality of that actual tube is - unfortunately the current state of the circuitry doesn't do a good job of showing it off.

@RetroTechorDie

2 жыл бұрын

The listing says greater than 380 lines....but who knows if I can trust that. Once I get the power issues sortes we will have a better idea.

@booboo699254

2 жыл бұрын

Still as of 2011 :)

@Zyo117

Ай бұрын

Only current manufacturer as of 2024 I believe is Thompson electronics for use in military and aviation maintenance.

Awesome video and great music!

@RetroTechorDie

2 жыл бұрын

Thanks, glad you enjoyed it!

I hope new CRTs can be made somehow! What you’ve done and what you’ve been able to source are a good start, but I hope we one day see a future where we are all guaranteed to be able to play games like Duck Hunt, Dr. Mario etc the way they’re meant to be played! Someone on Facebook just told me “new CRTs are impossible to make, making the leaded glass required would break environmental laws worldwide”, surely CRT glass doesn’t need lead? Surely there’s another way? I agree we need to reduce our carbon footprint, especially in light of how hot the last 2 summers were (which were the last 2 winters in the southern hemisphere) but I still think there should be ways we can still enjoy doing what we do, while still not harming the environment! I’m sure people once said there’d “never” be an animal-safe substitute for ivory, but many have been found over the years since!

I ordered the kit and it arrived today with severe shipping damage. The CRT broke loose from the cabinet front at all four mounting points. All CRT socket pins are bent 90 degrees and the glass nipple is broken, with loss of vacuum. The yoke coil has a broken winding too. It looks like i have everything needed to complete the circuit board. A new CRT, yoke and cabinet front are needed to make my set complete.

@RetroTechorDie

2 жыл бұрын

That’s a bummer! When I ordered my second kit it was missing parts, I contacted them through AliExpress and they shipped replacements for free. Might be worth a shot to contact them.

You're a legend and you've gained yourself a new subscriber! I wish one day when I grow up to build a CRT TV for my own future house!

@RetroTechorDie

Жыл бұрын

Welcome aboard!

PAL and NTSC systems are not compatible.

@stephentrier5569

2 жыл бұрын

Bingo. China uses PAL-D video and the US uses NTSC. The signals are similar (for black and white) but use different timing, and that difference is showing up as the funny-sized image. It might be possible to modify the circuit to use NTSC, but it would be challenging.

that DankPod background music tho 😂

@RetroTechorDie

Жыл бұрын

...believe it or not until people commented I didn't know who DankPods was...I just wanted jazzy music

Are you sure you giving this thing the correct voltage? ⚡ It looks like if it's underpowered, because normally the audio shouldn't affect the screen at all! 😉

Glad I got a few CRTs when they were being tossed out. I sat some VCR combo on the curb and it was gone in an hour. I believe the buttons were shorting as it would wake up and do strange things in the middle of the night.

wish their was a color one some day i hope thay will brang color crts back

😁 you need to check the H and V controls, some times a capacitor is working at lower capacity, a leak may occur. I've seen that problems on trinitron tv's on 1987. The schematics on that time had some test points and also a small signal chart to compare via oscilloscope. just like alldata for diagnostic car's computers. Mainly problems on TVs: leaking capacitor, empty capacitor, open wiring, cold solder, broken solder, over heating transistor, missing ground, inverted wiring, wrong transistor or defective. Fortunately I still have one 5.5 TV which I've used to see satellites signals on 1997 in open field.

@RetroTechorDie

2 жыл бұрын

My gut is telling me all these caps are jut bad....or at least very poor quality.

Well, I'm looking forward to see the update. Hopefully you can have some better geometry and no audio/video interference issues. Good luck!

Came from twitter, definitely glad I did after seeing this! Ps subbed

@RetroTechorDie

Жыл бұрын

This video was a lot of fun, I have part 2 in the works now.

@TechDave

Жыл бұрын

@@RetroTechorDie siiiick

Situation of image size and sound behaviour seems to be lack of voltage issue. Feel free to contact for debuging)

Smash melee fans can definitely want to find this

They also have 4" "flat" style CRTs with the required circuitry. And they're not bad at all. They're pretty much the guts of an old Sony WatchCam. Reason prices.

@RetroTechorDie

2 жыл бұрын

I saw that and I really want to make a handheld game device with it.

@Kylefassbinderful

2 жыл бұрын

@@RetroTechorDie They also sell small analog camera sensors and I think making a video walkie talkie would be cool. I don't know if making it wireless would be worth the trouble but wired would still be cool. Mount a small camera w/mic above or next to the CRT on each end and have it show up on the B&W 4in CRT w/speaker on the other end. I think it would be a relatively affordable project.

Good luck got love you 😍

The english datasheet for the TV chip can be found by searching for AN5151 or KA2915

alibaba sells crt tvs as a whole

Wish they would make a 9" version so we could mod it into a VECTREX .

@Z64sports

Жыл бұрын

Don't you need a special screen for vector graphics?

This was fun. I kind of want to build one, but also I don't need a 5" CRT around. So torn.

@RetroTechorDie

2 жыл бұрын

Its worth the ride!

You have to check all the power supply voltages. There is a problem there. The louder the volume gets - the more distorted and smaller the picture gets. Those two thing should not have anything in common.

@RetroTechorDie

2 жыл бұрын

Agreed, issues is no documentation shows expected voltage. Regardless I will keep troubleshooting.

@eltrylogis

Жыл бұрын

@@RetroTechorDie In fact, if there is, You have the diagram what more need? According to the datasheet, and the same page, they say that it is powered between 8 and 12 V with 10W.. The ic need between 8 12 V maximun, more will destroy,10V is nominal The D386 need 4 - 12 V maximun... more will destroy.. 6V is nominal You can use a 7806, three terminal regulator with a head sink, for the input voltage to IC D386

@westelaudio943

Жыл бұрын

Yeah that's rail sagging... Seems like the transformer doesn't put out enough current/voltage or a stabilizing capacitor, voltage regulator etc. doesn't work properly.

Thanks to share your find and skills! Please you think it's possible to "connect" a Raspberry (or other similar) on it?

@RetroTechorDie

Жыл бұрын

Anything with composite video out can connect (or RF).

Suggestions: 1. Increase the voltage and ampere of power supply, you can use a variable voltage lab power supply but be careful as over voltage will surely fry the unit. 2. Please check if Horizontal and Vertical connection of yoke coil are not interchanged. Please do let me know the result. I am excited.

There is definitely a power supply issue here. Is the CRT heater voltage the same B+ value? You'll probably need a separate voltage regulator for the picture tube heater, so you can tinker around with it if there is no actual power requirements data

@suzakule

Жыл бұрын

look at the schematic, the CRT heater is driven from a winding off the FBT. pins 4 GND and pin 2 via a resistor , most likely very low voltage.

i love how the images go shrink whenever there is sound

@RetroTechorDie

Жыл бұрын

Its got a circuit bending vibe going on

"Thankfully it didn't blow up" lmao, can't wait for the follow up!

Hi! Brilliant! What is the code or characteristics of the transistor that you show almost at the end of the assembly and is placed on the heat dissipating aluminum plate? Thank you.

@RetroTechorDie

9 ай бұрын

D880-Y NPN

I would say the speaker is causing the issue with the voice coil energizing but when you tested it with the back off the picture was still shrinking when the audio was going. The transformer might not have enough VA to run it, have you tried using a 12volt wall wart? I would check the voltages for example Z1 and see if you're getting around 6 volts and check Z2 and see if you're getting around 33 volts. wouldn't hurt to check the transformer when it has a load and see if it's bogging down. While thinking about it doesn't China use PAL video?

Could it be made to accept HDMI? That would be funny :D

May pick this up myself! Green video my friend! Sub earned ❤️📺😎 ps. Would really like to see a rgb mod possibly added or for them to possibly sell a color set.

@westelaudio943

Жыл бұрын

This picture tube cannot display colour no matter what.

@westelaudio943

Жыл бұрын

Colour CRTs have a triple gun assembly and a shadow mask with colour phosphorus lines. This tube puts out only one electron beam and has a monolithic phosphorus screen.

I bought one of these. Arrived with the back of the CRT smashed off thanks to bad packaging. Now I have to find a replacement CRT as I still want to build this.

@RetroTechorDie

Жыл бұрын

This was my biggest fear when I ordered mine.

Your audio causing deflection issues could be power draw, or it could be an unshielded magnet too close to the tube. I want to bet it's the second one.

@youtubasoarus

2 жыл бұрын

My thoughts exactly. Higher input into the voice coil would probably disrupt the tube.

The voltage seems to be too low. I have some portable 12v tvs and if you power them with 9v, 5v, etc, the picture shrinks and becomes distorted like in your case. Tracking down what part is supplying/recueving the low voltage is the hard part

Can you make a video of this when it is playing music (To show screen jumping)?

This begs to be turned into a gameboy player, like the old Sharp tvs that had Famicom and later snes consoles built in.

U.K. has been doing this for years.

Only had a quick look, so you've possibly covered this issue. I'm wondering what the line number is. Are you driving it from a typical North American 525 line source, or a 625 line one? Or can the set be switched to either? It would seem strange to ship a set with a 525 line standard (used in the Americas) with a 220 volt transformer.

You definitely have a power supply regulation problem, plus there's a hum bar going through the screen....if you had a good schematic with proper voltages it would be easy to find where the trouble is. It's a cute little TV.... definitely check the regulation of both low and high voltage supplies. The audio should never pull the crt pix down. Check it out.... you may have bad electrolytics as you said. Esr meter would check if they were good. Best wishes.

Would love to see Shango066 do one of these!

Also I don't recommend leaving that CRT on for so long in the case of not enough width and height because it's concentrating all the light on a small area which can cause burn-in.

have you tried sliding the Deflection yolk towards the screen?

@RetroTechorDie

2 жыл бұрын

Yes, Its as far forward as it can go. I even "carefully" bent the coils to allow it go closer. However looking at images of a "working" unit that yoke is as close as mine.

This would be worth sending it to shango066 to see if he can figure it out. This would make a really good video on his channel. Just by looking at it and learning a lot seems like the B+ is low maybe from the wrong value resistor or bad cap on the regulator circuit. This also helps spread out the deflection when the B+ right on spec. It also helps with the high voltage needed for the flyback to work properly. I seen many videos that looked similar to this issue and it being low B+ voltage because of some dead caps on the regulator circuit.

@thetechgenie7374

11 ай бұрын

The last person you want to sent it to is “shango066” you get a interesting video but won’t be on what you think about it be on repairing it. It will definitely likely end up being a EOL video.

Hey, you never posted an update to this project. I'd like to see this running right.

Was this an educational kit, or a discontinued product rebranded as an educational kit?

@RetroTechorDie

Жыл бұрын

The best information I can find is it was a training kit, to work on assembly skills and more advanced electronics. It may or may not have been designed to work perfectly, more like hey it turns on and dident blow up your good. I am stalling on part 2 until I can find more information about these guys.

I wanna see what we could do with crt technology today cause processing power is so cheap nowadays, we could prob have like 8K 200hz+ crt displays

I wish it was color! I need something for my WS4000 emulator.

Can you do another video of this with better material starting from scratch. I would like a color tv demonstration if you can.

@RetroTechorDie

11 ай бұрын

That project may or may not be on my work bench now...

Question for yall, could a color tint be applied to the crt? Like a green or amber film or something?

@RetroTechorDie

2 жыл бұрын

I don't see any reason why it couldn't.

Hello; Where can I buy the same electronic tools you are using,in your video,thanks................

@RetroTechorDie

Жыл бұрын

I updated my description with Amazon Affiliate Links. Thanks!

Adjust the vertical height and the horizontal hold

Cool bro! Please can you tell me: it's black and white, right? Any possibilities to have colors?

@RetroTechorDie

9 ай бұрын

Not with this kit, the PCB and CRT are B/W only. A color one would be more complex.

@BRAD-ROTT

9 ай бұрын

@@RetroTechorDie Thanks!

@BRAD-ROTT

9 ай бұрын

@@RetroTechorDie Please I have a project for a diorama "large scale" (1:3 or 1:4 APPROXIMATELY) of a "mad scientist lab" to make a vintage computer like Armstrad CPC 6128 something like that... with a mini CRT COLOR, will display 2D animations of ''experiment data of BIOLOGICAL informations, mathematical and chimical things'' you know, can we discuss dear friend? ☺🤗 Because I know nothing in electronic...

I hate CRT displays (I have very little tolerance for flicker), but I still ended up watching this. I wonder: could this be a basis for a DIY monitor for use with an MDA/Hercules video card?

@RetroTechorDie

11 ай бұрын

That is an interesting idea, I would venture to guess with better parts (and a new main board) its possible.

@Roxor128

11 ай бұрын

@@RetroTechorDie The IBM manuals archived at minuszerodegrees do include the schematics for a few of IBM's various monitors from the PC/XT/AT era. Definitely the monochrome and colour ones used with the original PC, though not the Enhanced Colour Display for use with EGA. EDIT: There's a link to another site which does have the circuit diagram for the Enhanced Colour Display, but you have to pay for it.

Is it supposed to be monochrome, or is it a PAL/SECAM TV receiving NTSC signals?

@RetroTechorDie

9 ай бұрын

B/W by design.

In fact to much heat sink compound is worse than to little. Most people think the compound is an extremely thermally conductive. In reality the silicon oil loaded with a metal I oxide is not nearly as thermally conductive as aluminum.the function of the compound is supposed to fill in tiny irregularities in the serface interface between the device and the heat sink. The metal to metal interface is by far better than so much compound that the device is floating on compound.

If you can build me a pvm ill give you my signed copy of madden 2007

Sir in my portable 12v bw tv a vertical line appeared in the centre of screen what happened to my tv 0please help me

@RetroTechorDie

5 ай бұрын

Sounds like Vertical Line Collapse, could be an easy fix... kzread.info/dash/bejne/X3mnz9ixadnAac4.html&ab_channel=shango066

I build tube amps from China but I don't use their components but source all resistors and caps locally just to play it safe.

@RetroTechorDie

11 ай бұрын

I am (still) working on a second monitor I bought, but I swapped out all the components (at least the ones I could find replacements for).

isn't the speaker magnet just too close to the CRT?

@RetroTechorDie

2 жыл бұрын

I got the same results with the speaker removed and moved in different positions.

gracias!!! por el diagrama!!!, saludos

Who built that circuit board to be able to program the tv to work? If they suck at it, perhaps we can do better? And who built the cathrode glass tube? Is all this from China?

@RetroTechorDie

Жыл бұрын

All from China, no clear manufacture. I keep dragging my feet on a follow up video, but I have good scans of an unpopulated board. I know the community can make a better version.

@JohnyTheWizKid

Жыл бұрын

@@RetroTechorDie I have an RCA Lyceum tv and it has RGB but the tv itself only has 8 colors. So when I tested it out, it looks like crap. So I asked around and the only way is either mid it within or replace it with a new cathode tube, chassis and wire it so it'll support full analog RGB or include ypbpr. What are your thoughts?

Did you recap it?

@RetroTechorDie

10 ай бұрын

...ehh...technically yes. I did buy another kit, but I replaced as many parts as I could with quality parts. (eventually I will get that video posted)

@sshmiam

7 ай бұрын

@@RetroTechorDie Keen to see it! very interested in whether it's a power issue / manual tube tuning like other users have suggested or something more significant

I'm trying to copy the PCB, Could i have the height and the width from the original PCB? I want to test copy the PCB and make the TV with my components. I have clonated the PCB from a photo take from google images and i have drawed the tracks in the PCB in Photoshop and i need the height and width in order to make the PCB at home with the correct scale. Thanks!

@janno288

2 жыл бұрын

i also bought the kit and i will send the dimentions. Wait for a bit. i will edit this message to let you know

@TheXoriso

2 жыл бұрын

@@janno288 Thanks, very much, i clonated the PCB from the photo taken from google images. I used for a reference the dimensions of LM386.

@RetroTechorDie

2 жыл бұрын

Mine measures 5 5/16 inches (135mm) wide by 6 1/4 inches (159mm) long.

@TheXoriso

2 жыл бұрын

@@RetroTechorDie THANKS!!!!!!!! I will post my results.

@RetroTechorDie

2 жыл бұрын

@@TheXoriso Looking forward to it!

Hello;;your problem with small picture,push the yoke all the way forward until stops,this will solve the problem

I built one, the problem I have is that my image is very dull, I suspect that the HV is too low, but the raster fills the whole screen. Once I get mine going properly, I will post videos too.

@RetroTechorDie

Жыл бұрын

Please keep us updated! The more I dig into the origin of this kit, the more I am convinced it was never intended to work perfectly. As a training/teaching tool, it woks. It forces you to construct a more complicated device and if it powers on (and not blow up) great! I can see this being a challenge for someone learning to solder.

@JamesCutlervk2tim

Жыл бұрын

@@RetroTechorDie I suspect that the heater in my CRT is suspect - I have 8kV on the anode, 74V on the focus grid (G2) and I haven't checked the voltage on the video grid yet (G1) but that is my next step. I am hoping my CRT isn't faulty. The deflection board works well, I get audio from the tuner and can hear the vertical field rate from the speaker (Buzzing sound)

@RetroTechorDie

Жыл бұрын

@@JamesCutlervk2tim It seems like a mixture of poor quality and these sitting for years have induced some interesting faults.

@JamesCutlervk2tim

Жыл бұрын

@@RetroTechorDie 6V on the heater and I have a full screen raster :) Working well. Focus needs adjustment but I think it will be fine.

@JamesCutlervk2tim

Жыл бұрын

Also, I run mine from a regulated switchmode wall wart, so it gets 12V all of the time.

2022 model crt?

@RetroTechorDie

11 ай бұрын

Likely NOS from 15 years ago.

do you live in a country with 110V mains voltage? In China it is 220V!!! It looks like there is not enough voltage. Does the circuit diagram state what voltage should be applied to the rectifier capacitors? I wouldn't be surprised if it's too low. This "kit" is actually a set of parts from a device that is no longer in production.

24:50 typical brownout behaviour. Also, these small thingies tend to run on 15/18V (before rectification)

@RetroTechorDie

10 ай бұрын

Agreed, I am still tinkering....Got it up to 20VDC and no change in screen size.

Hello; you still have the same problem,small screen,does not fill up.....

Hook up a Gameboy, in your next one.

@RetroTechorDie

Жыл бұрын

Its funny you mention this...Ali Express sells a Micro 4-inch CRT (the kind that would be used on a video door bell in the 80's and 90's) I have toyed with the idea of building a handheld CRT gaming device. (probably a NES)

@badreality2

Жыл бұрын

@@RetroTechorDie Thanks! I mention the original Gameboy Hardware, because its games have a monochrome color palette. ...if your new C.R.T. is has a color palette, a GBA, or a DS Lite Composite video modification might be better. A 4" screen a suitable size for these consoles, and of a NES will great, at that size! Gameboy Composite Video Mod kzread.info/dash/bejne/X6mjmKZwe9a7ZrQ.html Gameboy Advance Composite Video Mod kzread.info/dash/bejne/iWert9KEd8Wwj6w.html Nintendo DS Lite Composite Video Mod kzread.info/dash/bejne/eGiim9GScqnPfaw.html

@RetroTechorDie

Жыл бұрын

@@badreality2 Awesome information!

@badreality2

Жыл бұрын

@@RetroTechorDie Thank you. :)

Use( transistor 8550) on vertical section picture will get bigger

@RetroTechorDie

3 ай бұрын

Just tried this, no dice. Did it work for you?

Maybe is the 120V 60hz

Where’s the link I can’t find one

@RetroTechorDie

9 ай бұрын

In the description and I posted it here: www.aliexpress.us/item/2251801596292172.html?spm=a2g0o.productlist.0.0.4eed2965xKFrgh&algo_pvid=b81a1715-87ee-4148-aa97-a0b9540e893f&algo_exp_id=b81a1715-87ee-4148-aa97-a0b9540e893f-22&pdp_ext_f=%7B%22sku_id%22%3A%2210183807683%22%7D&pdp_pi=-1%3B82.87%3B-1%3B-1%400%3BUSD%3Bsearch-mainSearch&af=9485&dp=20220206cll8pvjfevhh&aff_fcid=feecddc82d164d2b893e4a8314fae4d6-1644091063786-08793-_dXdw8xt&aff_fsk=_dXdw8xt&aff_platform=portals-promotion&sk=_dXdw8xt&aff_trace_key=feecddc82d164d2b893e4a8314fae4d6-1644091063786-08793-_dXdw8xt&terminal_id=0b1121d11c8447628ca1fc208bc4e24c&gatewayAdapt=glo2usa4itemAdapt or www.buychinesebag.com/goods/item/detail/id/15214324919

@PITASFORLIFE

9 ай бұрын

@@RetroTechorDieis it easy to build

@RetroTechorDie

9 ай бұрын

If you have some experience soldering, yes I would consider it an easy build. Even if not its not terribly difficult.

Is it PAL or NTSC? Also never adjust the pots with a metal screwdriver while it is on. Buy a cheap plastic tweaker to use so you don't accidentally fry the board or get zapped.

it is light because it is 220V

Funny Man

I agree with others, the power supply appears weak..

The current more than the voltage drives the definition yoke the transformer is to small try a larger transformer it is confusing since the one that came with the kit looks worse than yours. You can see driving the speaker is effecting deflection I would try a 12v transformer another amp or 2 another trick is a low resistor across the h another across the v experimental but I bet it’s your transformer