I have a horrific hangover and watching my beautiful man fiddle with an oscilloscope is oddly soothing

Hi Alec, I'm watching all of your videos in chronological order. They are very cool! The noise you see on the RF signals is due to the ground, but not Earth vs circuit ground, but rather the length of the ground wire of the probe. The only really good way to get a good 'scope image of these signals is to use the "ring" around the tip as your ground. In fact, if you could connect a BNC connector right to the board ground and connect the signal with a short wire, and then plug the probe into it, you could see beautiful high frequency signals. By the way, I designed PWM power amplifiers for years, and if you wanted to do a video on those, I'm willing to help you with advice. I think and thought they were so cool! Great work and I love your sense of humor. Please keep up the good work!

You should've put the top down view fullscreen and the overview as picture-in-picture.

If you ever do this again, do it with a Sony player, (or any other brand) they actually mark the test points to what they are. The eye pattern (almost always marked RF or something like that) looks pretty nice, also your ground lead should have been connected to a ground point in the CD player.

The "uniform" waveforms are probably system clocks also ya might want to find a signal ground...love your vids !

Thank you for this video, I love all your content!

This was actually really cool to watch.

"This is just the 60hrz power wave... for your enjoyment." I actually did enjoy that. Cheers.

No oscilloscope experience - and you still got what you were looking for. w2aew has some good tutorials on the usage of oscilloscopes. From basic to very advanced. And like you - such a pleasant guy to listen to. (Was that too 'greasy')

Even if it might be boring to most people it was real interesting to see for me! I should poke around in a CD player with my Oscilloscope and see what signals I can get on the screen.

An easy suspect for a lot of the noise is how long your ground lead on the probe is. Clip it to an earth point on the PCB your measuring. Amusing to watch video though. :)

I could watch 3 hours of this :) Amazing video! Thank you!

This was ridiculously funny to watch and I dont know why :) I found your channel 3 weeks ago you have some top content. You are very good at hosting keep it up!

They install a mirror on the ceiling, pointing 45° outward, and they point a camera up at 45° upwards or whatever triangulation you need to make it so the camera is farther away from you... That's how you shoot your desk...

The various "constant frequency square waves" you find are clock signals. I bet if you look at the frequencies of some of them, they'd be interesting multiples of 44100.

First! Thanks for this, really love your content and gentle humour :)

It's a good idea to take good resolution pics from different angles of any device your going to muck about with, showing details of wires etc. We've all done it though, drawn which wire goes where on a bit of paper, then lost the bit of paper, easily done. Another way of tracing a circuit is to find datasheet's for the IC's in your device, they often have application notes with circuit's, that manufacturer's use in said device. It helps you make sense of the circuit. good luck, A.

In the apocalypse you will run barter town! You are like a mad max electrical genius. Nice videos

It's so nice to see someone troubleshoot in real time. I know it's not gonna get you'"the most views", and stuff, but some of us really appreciate it. Thank You!

Awesome video. I always thought a cd output would be pure square wave, but this shows that its actually not perfect and makes one appreciate ECC even more

A scope is a nice way to pass a couple of hours :-)

Ah! Brother, this needs to be a sub-series. I love your videos, and I'm a firm believer in the idea that two fives don't make a ten. I'd rather get one ten every two months than six fives every two weeks. Not to say you put out fives, but just saying that more broadly. I want more loosely edited, not-at-all planned videos!

I just realized that we can see your laptop’s screen in the left side of the background. Nice touch !

You remind me of myself when I'm trying to repair a device. The only difference is that you are using an oscilloscope and I'm using a coin to decide if I can touch something or not :-D

that scope has trouble triggering on the down swing so you have to use the invert on the channel selection (should be on the right list if you have the channel selected) then it will trigger fine.

This setup is hilarious. I love it.

It can be difficult to figure out what's going on when it's your first time poking around something like this. Here are a few things to keep in mind: 1. Not all signals can be correctly measured using the regular passive probes your scope comes with. You often hear people talking about differential probes (which are usually more expensive than the scope :P), and they'll suggest using those in several scenarios. The most obvious one is when there is a differential signal. Often also referred to as a balanced line signal. This is where the signal is split into two halves (if one goes up, the other goes down) and sent down an unshielded pair of wires (often twisted, but not always). As long as they're the same length, both wires pick up exactly the same noise in exactly the same direction (called common-mode noise, because it's common to both wires). When you scope one of those lines (and tie the other to gnd through your gnd lead), all you see is a noisy mess. But if you feed that signal into a differential amplifier (i.e. literally every single op-amp chip on the market), a.k.a. a comparator, it will amplify any voltage difference between the two lines and ignore all the bits where the voltage is the same (i.e. the common-mode noise), thus reconstructing a very clean signal. A useful measure of the quality of a reconstructed signal is the amp's common-mode rejection ratio. Anyway, a differential probe has one of these inside it. That's why it's also called an active probe (it actively amplifies the signal). Sometimes it's the only way to measure a signal like this. But you _can_ jury rig a solution to this using a two-channel scope and passive probes. As long as you can find a good common gnd reference, connect ONE ground lead there (all channels are internally grounded together) and one probe to each signal line. Then apply the A-B operation on your scope (this works particularly well on old analogue scopes, it's entirely done in hardware) and voila - you've just built a very crude yet unnecessarily complicated differential amplifier. Where this doesn't help though, is with very weak (high impedance) signals. See, your input channel presents a resistance to ground (and capacitance, if you're coupled in AC mode). Typically that's about a megaohm, which is enough to stop you getting electrocuted if there's line voltage on the other end and you touch it (

I recently watched a seires of quite skilled people fixng an apollo guidance computer. This is a nice relaxing contrast.

i am getting nervous when you lay you arm over the transformer unit.. hope you are well un-grounded.

I love what a scope lets ypu see. Funny enough I last used mine to diagnose a faulty chip on my dishwasher control pannel.

Thanks!

"I hope I don't break anything~"

I grew up with Pioneer CD players so it would be really interesting to see a comparison between Sony and Phillips' laser pickup methods. I've always assumed it uses a Sony mechanism, and yes, I know I could just open one myself, but I think it would be more fun to watch you do it.

Outstanding

3:11 - "Bumm. Er." Lovely :D Can I sample this for my music?

Valid point about getting the waveforms , it was much easier on older players .

More oscilloscope action!

18:10 alec turning into doofenshmirtz for a second when he finds something

were you scratching the tune (like a record) at its end ? :) I found its from Jan Boyle - The Light In The Storm but that one has vocals. Sadly couldn't find the instrumental version.

18:48 Nice background in the shelf :D

Спасибо! Интересно и познавательно.

I don't remember if the 1052 has it but my rigol has a AUTO button so you don't have to mess with the h and v scales. It's almost always spot on. Or it gets you in the ballpark

If you could use a basic walkthrough of how to use a digital or analog oscilloscope, as well as some of the pitfalls, I’d be happy to help you out whether by phone or Skype (or whatever else we may have in common as I’m not on Twitter or Facebook). There are also likely to be countless KZfaq videos on this same subject, though caveat emptor since making a video on a topic and understanding the topic that one is making a video about do not always go hand in hand (besides, even the best and brightest of us can make mistakes now and then). One of these days I’ll finally get my own electronics channel off the ground but health and my duties as president of our local amateur radio club have occupied my time these past few years. 73 de KW4EK

0:05 music? And why did it play backwards after😂😂

You had me at Oscilloscope I used one in height school this is not one of the best videos you have done but thanks

I suggest take a thin coax, put a terminator on the scope side and a SMD resistor divider on the measuring side, and ground it few mm from the measured point and don’t touch it, solder a gold plated 2-pin header into the curcuit and plug the probe into it. These ordinary probes are conceptionally bad for RF signals. No wonder you are seeing noisy signals.

Once I tried to debug a RF interference in a RONJA (search it on Wikipedia) with a digital Tektronix oscilloscope and realized the internal computer in the oscilloscope polluted its own input with more noise than the measured signal. So I had to buy a Russian analog oscilloscope and that was a success. It actually showed what’s on the input and not random garbage from its own CPU.

Probably the player is struggling because he osc probe. Try setting he probe to 10X to unload the circuit more. Not entery sure about this DACS but probably the ouput is not the final signal until it is passed through a filter. Modern one have this filter built in, but the old one probably not. Filter is mant to cut the BW and take all the noise away. Noise is located way above the audio BW. Or you can use the scope filters.

This is like geeky ASMR

0:28 "I have my laptop to look and see what I'm looking at" WHAT??? Something about that phrase... maybe im wrong.

00:13 how d'you spell "watching" again?

Rigol (n) contraction of rigamarole.

Nice video .... are you a science teacher?

Eyyy! Pentaxian!

0:14 Why did the music reverse???

🤣🤣wiggly wiggles

argh its hurt to see you a little blurry while constantly moving, and the tripod which got all the focus stand still :(

Oh my God! lol I don't know for sure, but you may very well have exemplified the only joke I was ever able to tell in the year of physics that I had to take. It was the first lab in which we used an oscilloscope and the teacher was giving her introductory lecture. She said that we all needed to put our electronic devices under the desk because the electromagnetic signatures going to them might interfere with the oscilloscope experiments we were going to do So I sometimes ADHD and autism aren't the best combinations for being the classic good student but I was a nerd as well and so I accidentally blurted out, "What about the electromagnetic energy coming from our hearts!?" Then, I continued, "I'm sorry, students, but you're going to have to do the experiment from under the desk." It was incredibly rude for me to interrupt my teacher and that's what ADHD does sometimes and, when combined with autism, sometimes you just say things.... ....But, my teacher started laughing so hard from my joke and she apologized that she had to take a moment and laugh because it was SO funny. So her and I did some laughing and, despite her being a pretty hard grader, I took her class for two out of the three ones I had to take for my required year of physics. The third class that she taught didn't fit into my schedule. She was a hard grader but she would really help you understand the stuff, which seemed really overwhelming to me at first. would

2:27 Mr. Prepared XD

Wathching. Whoops 😂

who noticed the screen on the wall mirroring his laptop

1:26 NO, You should have attached the ground of the scope to a ground reference and learned how to use a scope first.

Was that "invertedly" smooth jazz?

Awsome

I don’t know for servicing but for factory test, we develop teste machine with needles touching test points on the pcb. The Test Points(TPs) can be any blank pad with exposed copper in random places. goo.gl/images/wMufV2 here’s an example. For servicing, you can make something similar so you take the whole pcb and place the test points where the circuit is fully exposed.

13:21 “Really?” Seriously though, I was half expecting to see sparks coming from the player whenever you touched something. Great video however.

Next time put your big image in a smaller frame and put what you are doing in the big frame!

If you have any power to the school can you give it to me

I intentionally went to the least viewed video.... Would you talk about how dial up internet works?

yo is that Mr Bean?

I hope you're being careful so as to not hit any 115V leads with your hand!

wathching, nice

I love your channel, but no experience with a scope? What is that about!?! Ping me and i'll give you a 10(+) minute crash course.

wathching!

Good video. I have a Rigol and I also do electronics stuff. If you are interested I would be willing to give you my contact info so if you do a video like this again I could give advice over email/SMS.

Song?

Slapping my forehead. Is this the one I should be watching? It takes practice to use a scope. Knowing some basics of impedance would be a good start. Also having a probe that you could clamp on a lead would be helpful. Also prepping by knowing what test points or pins you're gonna be probing. Too many suggestions. Don't be discouraged. With your interest in classic electronics I'd encourage you to get a formal education in electronics technology. I'm pretty sure you have a mind that can handle it.

If you ever get tired of the scope, you can send it to me in Australia, I can't afford one yet so I would love it! :)