HACKED!: CRT TV becomes a crude Oscilloscope

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In this episode of HACKED! I will show you how I converted an old CRT TV into a crude Oscilloscope. During this process I will talk about how a CRT TV actually works and how we can utilize the deflection coils of it in order to create our own picture on the screen.
Music:
2011 Lookalike by Bartlebeats
Ecstatic Wave, Jens Kiilstofte
machinimasound.com/music

[@HVinduction]

WARNING: You have to discharge the CRT because it acts as a capacitor and can deliver 30-40kV. Please do this only if you have knowledge of CRT's and the voltages that a CRT uses. Old B&W TV's use around 15kV. I even had a dead small B&W TV and after about one hour of testing it still had a charge. Also never discharge it with a screwdriver because you can damage the CRT and there are many dangerous materials on and in a CRT, and if you do it, do it outside and wear a facemask, and really do that if you vent it, otherwise phosphor can be blown of the screen (mercury too) and that can definitively cause bad lung damage, that was with the same B&W TV.

[@slm60uk]

Definitely. NEVER put your fingers behind the rubber HV cup fixed to the tube - I once did this on the back of an old colour TV more than a day after it had last been powered, forgetting that the inside coating of the tube would still be holding a charge. The force sent me flying across the room and I guess I was lucky not to have been killed.

[@Muslim_011]

That's just theoretically, forget what you study, I always work with this kind of stuff and there is no problem, the only dangerous parts are the big capacitor but not a thing to kill and the THT output, nothing else

[@GpanosXP]

You're more than welcome to make a video proving what you said :)

[@Xenro66]

Can't agree more. The only time I took apart an old CRT, I made sure I took all the safety precautions and discharged he CRT. The spark is surprisingly large, and could definitely be a lethal shock. Stay safe out there!

[@zaprodk]

There is "only" 25Kv on this modern color CRT.

[@Henpitts]

Back in the early 70's I worked on TV's. I disconnected the horizontal and vertical yolk connections and wired them to the left and right channel outputs of a stereo amplifier. It presented a fascinating Lissajous pattern of the music.

[@Henpitts]

I just remembered that I left the original yoke connected but set to one side. Then I slipped another yoke onto the CRT that was connected to a stereo. Important to the HV to keep a load on the horizontal output.

[@moiquiregardevideo]

Henry Pitts When I made this test on a 1969 color TV, which still used vacuum tube to drive the horizontal/high voltage (+25kvolt), it appeared to work well with horizontal yoke unplugged. in case of overload, such as short circuiting the high voltage, the tube plates were glowing red but survived. With fully transistorized TV, any small stress and the high voltage transistor is destroyed. Not really friendly to curious experimenters.

[@karlscheel3500]

@@Henpitts You must have done the _exact same thing_ that my highschool electronics teacher did! ;)

[@craigmills9674]

Can you help me do that with an old mega watchman TV please Henry?

[@markarca6360]

Lissajous pattern? The logo of the Australian Broadcasting Corporation.

[@bansheedearg]

Back in the age of television when I was an awkward nerd, the late 1980s, a fellow nerd told me that connecting the deflection coils to an audio amplifier would create trippy patterns. Really just that, the deflection coils where the speakers to the amp. Classical music was mesmerizing. Waveforms seemed to rotate in 3D as the sound decayed. Before you do any of this, know a CRT can KILL YOU!! Yes, discharge the kill you capacitor, which is the big old CRT tube itself, by shoring chassis ground to the connector under the suction cup thing on the tube, the high voltage connector to the flyback transformer. If what I just said was Greek to you, never open a CRT case, high danger.

[@ewansbuzz127]

So did you connect the CRT deflection coils X and Y axis to the Left and Right channels of an audio amplifier? As i just wanted to know if that was how you sort of got a 3D affect on the CRT display.

[@bansheedearg]

@@ewansbuzz127 Yes, left and right to X and Y. To an old school transistor and heavy transformer amp. As a note decays subtle changes to the frequency takes place, and the left and right are out of phase, resulting in what appears to be a rotating loop or infinity sign. Best to find an actual oscilloscope to observe the phenomenon.

[@---777---]

Your handwriting is soo satisfying

[@Jono6671]

Superportvein neater than most native English speakers huh

[@bitelaserkhalif]

Superportvein he is also left handed, which adds surprise.

[@Jono6671]

Ozzeip Piezzo really? you learn something new every day I guess. thanks

[@rich1051414]

A lot of native speakers learn to write when they are like 4 years old, and then never attempt to improve it :P This is true for a lot more languages than english.

[@dirtybongwater5751]

ikr, thats the power of a gel pen

[@kjamison5951]

In 1990, at University, we heard about students who had successfully driven an oscilloscope to act like a CRT TV with the X, Y and Z inputs. Z input was used to alter the brightness of the trace. They were able to watch the World Cup matches on a tiny screen even though they had no access to a television. That’s what I’d love to see!

[@_funkytorino_]

kzbin.info/www/bejne/a3e8d2irnaitd68

[@Every_Journey_has_a_Story]

This is way over my head when it comes to electronics, but I still love to watch it..

[@cainespade514]

i love how the concepts were explaines... including the effects of voltage drops, deflections of electrons... Good job Mr. Scott!!!

[@dragxngaming248]

Using an oscilloscope to make an oscilloscope Thanks for over 300 likes! I appreciate that!

[@AschKris]

Thinking quickly, Dave constructs a homemade megaphone using only some string, a squirrel and a megaphone

[@donsilvestroso]

it is the same: "using gears to make more gears"

[@benceszabo5515]

Well not really He used a function generator

[@Alex0474]

*sOuNeeDaNoScIlOsCOpEtoMaKeAnOsCiLloScOpE cLiCkBaiT!!!* (and yes, i know, it was a function generator and not an oscilloscope)

[@MrDawen1997]

Oscilloception

[@Darren7MU]

You NEVER seize to impress me Mr.Scott. Well done and thank you for these videos!

[@matthiasmartin1975]

Ha, so cool - I did this too - many, many years ago. Very useful to check rectifiers, and as a music visualizer. I went much more low tech and simply connected the secondary winding of a small mains connected 50Hz transformer to the horizontal winding. Your usage of a stereo amplifier to boost/impedance-match both deflection coils is quite brilliant. Thanks for posting.

[@y2ksw1]

This kind of project was one of the very first I did a very long time ago, when valves were still in use. I got a very large oscilloscope which interestingly was also pretty precise and allowed to see signals which normal oscilloscopes were not able to view, due to the inferior resolution.

[@marek196c]

Instead of oscilloscope, you can do an audio visualizzer, showing you the audio wave of your audio output device (like mp3 player)

[@Shortyman17]

Marek S that sounds awesome and would probably be more interesting for most of us

[@krinistof]

You could do this also on an oscilloscope. Nothing changed. And also mentioned and Scott replied.

[@joe0932]

I think they mean a spectrum analyser, maybe? Like you get on EQs?

[@Johnlewis0876]

As he stated, it couldn't be used to perform any accurate representation as the crt was not tuned to perform this function.

[@moiquiregardevideo]

This is a good idea. CRT give much better view of the music than a few LED Using a color CRT, I suggest the following: 1 - disconnect the horizontal, but replace it by an equivalent inductance. Most TV require a continuity on the horizontal deflector as protection for the CRT. The high voltage fall to low level if the horizontal is disconnected 2 - connect the horizontal to a 6 volt transformer. We want a 50 Hz or 60 Hz sinusoidal wave, not the saw tooth wave shape of a typical scope 3 - disconnect the vertical deflector, connect it to your audio output of an amplifier. The impedance is around 8 ohm to 16 ohm, similar to a speaker 4 - disconnect the 3 wires that control the red, green and blue of the CRT that comes from the main board going to the PCB on the rear of the CRT. Apply 3 volt DC. This allow the beam to be constantly ON instead of flickering with the video data. You may still get an annoying black portion which is the retrace blanking. This can be removed by increasing the total brightness, a voltage control located on the high voltage flyback. If there is potentiometers on the PCB on the rear CRT, increase these as well to eliminate the retrace 5 - Use a magnet (from hard drive or micro wave or speaker) near the read of the CRT to separate the 3 colors. Modern CRT have such excellent convergence that the lines would be just a boring white. Move around the magnet until you find a location where each color separate, while avoiding to mix the color. You want the 3 saturated red, green and blue, not a mixed half ass of yellow, purple all jumbled. 6 - You may want to swap the horizontal/vertical since the horizontal can be swept 300 times faster. In that case, rotate the deflection coil by 90 degrees. This modification of a color CRT display music in a really majestic way. When the music contains lot of bass at 50/60 Hz or any higher multiple, very nice lissajous shape appear. The 3 colors are much more interesting to look at, compared to the boring green of a typical scope. If you own a function generator (as you mention in the video), replacing the AC transformer by the output of the generator, going thru an audio amplifier, you can set the scan frequency to the dominant frequency of the bass for each music you play, allowing these lissajou figure to appear. A further improvment would be to use a phase locked loop to detect the bass frequency on the fly. Displaying the locked frequency would complete the design for a tool that reveal the musical note for each base tone.

[@137bob3d]

on a store-room shelf is an old CRT monitor being saved just to play with. now with your guidance i feel ready enough to dive in and have some fun. i'm one of the few left of a shrinking population who grew up with CRT TV's... back when grocery stores had vacuum tube-testers and spare tubes for sale.

[@irfanahmad2192]

He realllyy poses great knowledge of electrical engineering Good going

[@k1ngjulien_]

"People who have too much time on weekends and so they just refresh their youtube subsciptions every few minutes" -squad

[@emilyfeng2186]

there is a thing called notification

[@keesanker4241]

"People with too much time" Damn I wish I had even enough time to study

[@samithasheshan8215]

K1ngjulien_ people with no life 😂

[@owatthorne2538]

don't you think that you have no time for you own interest because you are working on somebody else. somebody else like the one who created experiments like this.. before there where business and jobs there are people who do the testing and invent things for their own satisfaction not for money.

[@conf1rmed819]

K1ngjulien_ me

[@mr.nobody6829]

it's really enjoyable watching you draw the schematics, and your handwriting is beautiful.

[@BetuTBC]

wait, if you use both x and y with a stereo audio source, will that make a vector-scope

[@Fatness_UK]

amateur radio engineers were doing this 35 years ago with big old 22" tv's, I remember seeing one that an engineer had made

[@R3Cat]

Damn that sounds cool, I want to see one of these modified units

[@KennethScharf]

I'm actually amazed this worked. Normally the horizontal windings of the yoke are part of the HV circuit of the flyback transformer which generates the HV for the CRT anode. On many sets, if you disconnect the yoke you won't get enough HV to light the CRT (unless you substitute the horizontal coils of the yoke with a suitable inductor connected to the flyback).

[@Gijs7156]

i really like small crt's.. they have something special.

[@vextechnet5865]

Gijs gotta love that high frequency sound. Mmmmm

[@aerox8103]

look up DH3-91

[@jacobruminski6545]

Gijs I have the same feeling

[@euvo_sound]

I wish there is a speaker to salvage in the that tv...

[@dcfuksurmom]

they normally have a sharper picture, which leads me to think something was wrong with the one in the video, appeared to be out of focus which is usually not a good sign (symptoms of a weak crt), maybe it can be adjusted.

[@TheWildsourdough]

Very Interesting Demonstration. We all know that this will never be a useful instrument- but, as fun and clever demonstration- It works. Well Done.

[@rawhide793]

In terms of creativity in think you've excelled yourself here GreatScott - Well Done! There must be some more useful things that can be done with all the CRT's laying in landfill all over the world!?

[@kieferonline]

Cool experiment! I enjoy this type of video. It was thoughtful of you to also share the moments you got it wrong. I learn so much from those moments. Thanks!

[@00xero]

You are a mad man!!! I wouldn't even know where to begin on a project like this.

[@onlyrgu]

I think this is one of your best DIY video!! Kudos!!!

[@essentialtran9825]

Thank you so much for this! I was trying to figure out how to make a trigger circuit for a DIY CRO for some time.

[@djbare9]

I did a mod like this years ago with an old black and white tv, I utilized both the x and y coils to create Lissajous patterns by amplifying the signals from the left and right channels of a record player.

[@COCCLASHERZ1]

Awesome Video! Love your work!

[@Whiteseastudio]

Should it also be possible to make a phase-scope out of this?

[@hasemhasan1151]

I frickin love this video, I've been thinking of such a thing. You literally put my idea in head into motion. Thanks Sir!

[@kelvinstokes996]

Hehe, used to do this with old monochrome monitors. Tip: use the horizontal deflection coil and leave the vertical coil connected to the display. Loosen the screw which holds the clamp, which holds the yoke (the assembly which the coils are wrapped around) onto the tube, and rotate the entire yoke assembly 90 degrees, so that horizontal is now vertical.

[@gauravjoshi747]

great work great Scott

[@mohamedfairudeenmohamedfaj3972]

i dont have any idea what he's talking... but still .. im watching it till the end... awesoomeee..

[@ikonix360]

Very interesting. Was thinking about turning one of these small TVs into a clock using an oscilloscope clock board, but that would require a lot of work as the yoke would have to be rewound.

[@NotSleepy]

great presentation -- thanks -- I did this to old TVs in the 1970s.

[@jigolebim]

You're so smart. I love watching your channel. keep up the great work, greatscott. ill keep watching.

[@greatscottlab]

Thanks, I will try to keep it up.

[@wisteela]

Nicely done. I was a expected it to be one of those little black and white sets.

[@AJMansfield1]

Great idea, I may actually build this with the old black-and-white CRT I got a while back. Some improvements that I may end up making: -The arduino has an analog comparator built into it across AIN0 and AIN1, this can be used to enable a more sensitive trigger than with just software analogRead() -I'll probably try using the arduino's high-frequency PWM directly for the timebase output with a filtering capacitor. I've used it successfully before for playing PWM audio samples, and it should be good enough for a basic timebase.

[@alankingvideo]

I used to make and sold some of these in the mid 1970s when I was a child, but I used to rotate the coil. 90deg, I also added an isolation transformer to the input, this was also for impedance matching. I bought small used transformers from Henry's radio in Edgware Road in London. There were a lot of abandoned TV sets at the time, probably because they were VHF only, and broadcasts for the new BBC2 channel was only on UHF.

[@drewdavis1092]

Love u Scott you really are great

[@karlscheel3500]

I remember my Grade 11 highschool electronics teacher showing us his version of this hack; he actually used two separate deflection-yokes, one on the neck of the tube, and the other off. The class was blown away when he applied an audio signal, and got multicoloured, psychedelic Lissajous patterns on the screen, that varied according to the rhythm of the song he was playing. *VERY COOL!* :)

[@lintangwisesa]

great project as always, Sir!

[@maxivinales4399]

You are such a genius. Stay creative!

[@jasonsnavely1918]

3:24 I don’t want to here you say that ever again, my friend. You’re helping others understand a lot of things. Keep up the good work.

[@SteveJones172pilot]

This is a great video.. As someone trying to make a hobby of fixing old arcade machines, this takes a little of the mystery away from the CRTs I'm afraid I'm going to electrocute myself with! :-)

[@anmoldubey3628]

Hey Scott! You are truly great...

[@cemx86]

Back in my university days I took an old TV and hooked it up to my audio stereo equipment so that I could have a fun music display. It didn't really matter if it was triggered correctly. I was just cool to look at!

[@hugotheboss4545]

I didn't understand anything, but I love to watch these anyways! This channel should be bigger, I bet one of my teacher would love to see this.

[@NaoPb]

I've learned some things about CRT's. Thanks! :) .

[@sreeprakashneelakantan5051]

Feeling nostalgic.. glad to see this 👌

[@lucasrocha7826]

I did this to look at distortion signals from my guitar pedals design. It works just fine and its perfect for the job

[@buckithed]

I'm trying to build an R2R DAC to draw vector graphics to the x and y coils on a crt like the size of your but the beam barely moves. Im having trouble understanding the impedance. why does your output have impedance, and what formula do you use to tell what the voltage needs to be? also will an op-amp work for this?

[@roddiw2]

Damn neat handwriting and freehand diagrams!

[@HaLo2FrEeEk]

I had an old Tektronix 2465 oscilliscope that used to belong to my dad. That thing was ancient, didn't have nearly the functions that today's scopes have, weighed a ton, but was approximately 1,074 times cooler than any other scope I've ever seen, just because of how old it was. I ended up giving it back to my dad before I moved.

[@manishnebhani6657]

Can you please provide detailed information on how you stretched the electron beam horizontally? (Your previous video on turning CRT TV into a crude oscilloscope)

[@Emelin-cr8nc]

Thank You,Scott,for Your videos!

[@craftxbox]

"scoot"

[@Emelin-cr8nc]

craftxbox Aha

[@Emelin-cr8nc]

U Liked Your own comment?

[@craftxbox]

i didnt?

[@Emelin-cr8nc]

craftxbox "i" Oh,that grammar...

[@NorbertWeener]

could you make soldering station with display?

[@greatscottlab]

It is on my to do list

[@alexandrulazar6586]

With PID control ok :D

[@NorbertWeener]

But for people, like me, who have ordinary soldering iron... So we can build it ourselves.

[@NorbertWeener]

It's not fun that way to me because I love electronics and want to learn as much as I can

[@jakegarrett8109]

A good soldering iron can make you look like a pro (trust me, I have very little skill). The other big thing is to use Lead-based solder (I know, cancer, instant death, etc... Only do that outside), so its not recommended. The best is obviously the soldering iron. I started with some cheap 30w soldering iron, and it took forever and it looked terrible. Even spending about $5 on a 60w helped, but it does get too hot so you need to unplug it every couple minutes for about 10 seconds. My favorite one is a temperature regulated 200w soldering iron. I can set it to 200c thorough 480c and it auto-regulates itself to that temperature. Plus when you need to solder some big wires, it has plenty of power. Unfortunately it runs off of 220v, so I can't just plug it into a normal socket in the US (actually it had UK 50 Hz plugs on it, but it seems to do just fine at 60 Hz). Its great for tiny precise wires where you don't want to burn a PCB like I used to do all the time, and I mostly got it for soldering solar panels because I kept breaking them with a bulky soldergun and it takes a lot of heat to get wires to stick to them. As far as time saved, that was about 10 hours on just that 1 project, its really easy and fast now. I think i spent $20 on that iron, and it was well worth it.

[@davidbwn]

Done that in my early days in the 1980s. Good for a cheap cro but limited in bandwidth and you do get distortions from the deflection coils. Always best to try this with a B+W TV.

[@neerajantil9890]

great job greatscott

[@rodrigonegrelli]

Congratulations, beautiful work, I'm also building one ... Greetings from Brazil!

[@kohlrabiproductionselektro7077]

Cool, if you want, you can also check out my version on my channel :)

[@PeterRetep-pg5lo]

your TV oscilloscope is the best on the entire internet! Congratulations!!!

[@scottaw1981]

any good ones about doing this with a VGA monitor by just using the pins? I've seen some interesting setups as far as displays, but not much for making oscilloscope with VGA inputs

[@JOELwindows7]

an even technical rather than a simple setup. Cool nice Awesome.

[@manishnebhani6657]

Can you please provide detailed information on how you stretched the electron beam horizontally?

[@Jono6671]

thanks Scotty, some useful info in this vid

[@Taran72]

thank you for talking about this. I was just wondering if the $20 scope was worth it. I guess it is depending for which application. I deal with low frequency circuits up to the kHz range.

[@p1nesap]

Epic project and great diagrams as always. One of the best so far. What is that trailing/transient line at the end of the waveform doing?

[@HariWiguna]

Jeremy, that's pretty slick! I'd be too afraid of the high voltages. Now that you've figure out the voltages, how about using it as an X-Y scope and draw spirograph patterns in sync with music? or a vector graphic video game?

[@essentialtran9825]

Do you have a more complete guide or documentation on this?

[@bernabelopezramon4146]

Do you have a video of how make the tester that you use?

[@manishnebhani6657]

Hey I'm working on the same project can I used a DIY version of class D amplifier for my project?

[@m.emrahozkaya9903]

this was awesome, thanks for sharing.

[@UsePINpadtoCompleteTransaction]

Impressed as always!!

[@turkalpkucur]

From Great Scott, I learnt that, knowing to use osiloscope well , signal generator and ardunio, a person could do anything he - she wants!

[@FadiFadi00]

You are really GREAT man!! .. I've learned a lot from you !! Thank you so much, keep up the great work.... i wish i could support you on Patreon :(

[@liviu201]

How do you always manage to post something every week and be on schedule? You also have a job and you're studying for your master's degree (I think), so you must have a very busy schedule. Anyway, I love your videos :D

[@greatscottlab]

Making video is my job. But doing a masters degree along the way is quite stressful.

[@matthewpipes]

GreatScott! Master degree in what field?

[@ShaunHusain]

Joseph Nicholas he may answer but KZbinrs typically get a dollar or two per thousand views but the CPM value they call it varies a bit I think. So 100k views is something like a hundred or two hundred dollars seems he gets about 200k views on average so about $400 per video/week or $1600 a month, so not a ton but good income for a student part time thing.

[@DoctorBlankenstein]

Love this hack. Still haven't done it. But it's been on my list for years. Gonna do it.

[@asadkhan7441]

Man you awesome!I wait for your videos.

[@joekc1nko644]

so if you used the vertical harosotial coils you could make an xy scope?

[@FLyyyT_]

a little very off topic...I need some help on using my Japanese soldering iron in the US. it's a hakko fx 600 50w soldering pen with temperature adjust dial. it has the 2 prongs only and runs off 100v from Japan. what can I do to safely power it in US? If you're curious, I was in Japan for a while and needed a soldering iron. I thought it was going to be perfectly fine to use it in US at the time. my ideal is to achieve the conversion if necessary while maintaining the portability of the iron.

[@anoopsahal1202]

Superb! I like the melding of analogue to digital devices. Maybe a high voltage warning at some point in the video , I suggest the beginning.

[@FHBStudio]

And here I was hoping you'd be running signals through the coax cable or the V of the AV input. I too have an old CRT but I still use it as a monitor for my collection of old gaming consoles.

[@VedafoneYT]

Good work... Keep going

[@reaper84]

wow, impressive work!

[@bocmanisbertrups9292]

i tried this with my old tv and all i have is a horizontal line. When i increase the frequency the horizontal line starts to move up and down until it makes large line across the screen... is it possible to make the wave look normal if i connect red and blue wire to second channel of my amplifier?

[@kentaylor6120]

Anyone know the best way to make the screen on the TV show a full white image instead of snow so the the scope gives a good sharp line.

[@RobertoRosario]

Love your videos but also your diagram drawing skills! :) Make a video some day about your technical drawing tips.

[@perrykaleb6]

How do we disable to fail safe function on the TV when deflection coils are disconnected it powers off.

[@chhupparustom]

Informative. Would it not be easy to just use the vertical deflectors but rotate the coil yoke 90 degrees to make it appear horizontal?

[@LhDiy]

40 years ago, i did something like it and put the LS output of an audio installation on the coil and turn it 90°. If was nice to look at the music-oscilloscope when listen to Pink Floyd :-)

[@willynebula6193]

Man that was brilliant! as crude as it was very cool

[@kilgarragh]

I like how you needed to use your oscilloscope to make that oscilloscope.

[@SeaCowsBeatLobsters]

You can rotate the deflection coils on the crt if you loosen the clamps

[@dimuthumadusanka6994]

I also tried to convert my CRT to oscilloscope. but it was failed due to not having a saw tooth pulse for deflection coil . can you add Arduino codes and schematic to make the wave.

[@nataliarodriguez3740]

I like to plug a wave into each coil (both vertical and horizontal) and gaze at the lissajous figures

[@user-yw3ry4wd2x]

I HAVE BEEN WAITING FOR THIS!!!!! 😝😝😂😂😂

[@The_comentator]

I don't get it, doesn't the first coil you've disconnected has to be the horizontal one (left/right coil)? Otherwise the line wouldn't bend to the left/right with the external signal. And there would be also no vertical line, because the dot has to move up/down to create it. Or am I wrong?

[@The_comentator]

Oh, get it now, you did not disconnect the measured ones.

[@mariusdenhertog1824]

Hi, do you still have the arduino code for the ramp function? Thanks in advance!

[@adfjasjhf]

oh sweet you have All in One Tester :)

[@kroezing3946]

Is it possible to make a analogue gauge digital? Mick

[@tdata545]

I grew up in the 90s, so DEFINITELY had CRTs, but I just don't remember scanlines on any of the CRTs we owned. Yours seemed to display the similar "honeycomb" pattern my tvs had. Maybe since we bought quality tvs back in the day, they weren't horizontally arranged. I don't know. I just don't remember scanlines growing up. The closest I can think of having it, was the GIANT Mitsubishi we had in the basement, but pretty sure that was a rear projection tv and not CRT. Given its massive size. And the scanlines were induced by the corrugated front plastic.