Analog oscilloscope repair 4 - Finally working!

Рет қаралды 10,549

4 ай бұрын

The Tesla BM556 analog oscilloscope from 1982 is finally fully working! More high ESR and open circuit electrolytic capacitors, a bad LED and a problematic paper capacitor in an interference suppression filter module.
The 1st episode:
• Analog oscilloscope re...
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Пікірлер: 43

@1pcfred 4 ай бұрын

The cat is the brains of the operation.

@kd5byb 4 ай бұрын

I love his cat. She's awesome.

@1pcfred 4 ай бұрын

@@kd5byb she seems to be on top of everything too.

@Alchemetica 4 ай бұрын

Wow, you are building up an army of test equipment by resurrecting dead or faulty units. The pluses - stopping items going to landfill and gaining equipment at almost no cost. The power of knowledge. 🐱

@KeritechElectronics 4 ай бұрын

Exactly! Any vintage unit saved is vital to preserving history of engineering. Especially if it's actually used rather than just a still exhibit. I don't know how things are like in Czech Republic, but here in Poland we've got e-waste regulations that hamper saving the old tech from scrapping. It's harder to get stuff from universities, schools, institutions or defunct factories than it was 20 years ago. Oversight over e-waste processing facilities is tighter than it used to be, and while it may be good for streamlining the regular e-waste processing, it makes the real vintage tech harder to recover. It's treated as junk rather than increasingly rare treasure, creating scarcity and leading to prices skyrocketing as demand rises, fueled by the growing online collectors community and media. Used electronics marked has turned to crap over time as speculators drove the prices up. As a vintage electronics collector and afficionado who is on a very limited budget, I've got it harder than two decades ago.

@Alexelectricalengineering 4 ай бұрын

Nice one, can't wait for the next oscilloscope (BM556A) video.

@Pulverrostmannen 4 ай бұрын

I am actually working on two broken oscilloscopes myself here, one tube based and one transistor, I Think I am able to fix them too. and your video inspires me to push on

@fersanoderzert1044 4 ай бұрын

thank you for your nice videos. i learned a lot from you. pls be careful. the liquid leaking from the old Tesla filter (and other old paper capacitors) contains Polychlorinated biphenyls (PCBs).

@KeritechElectronics 4 ай бұрын

Hey, that's a cool filter identification device :). Nice restoration job. Other than those sewper dodgyyyyyyyyy capacitors, I love how this scope is built. I had this moment of astonishment when working on our local hackerspace's Unitra Unima OS-352 scope made in the '80s, it was also very clean and neat inside.

@Snowsea-gs4wu 4 ай бұрын

Hi, thanks for the video Diode!

@rhiantaylor3446 4 ай бұрын

You have a very knowledgeable cat !

@jozefnovak7750 4 ай бұрын

Thank you very much!

@sadikalarieski7340 4 ай бұрын

To get his hands on these rare stuff is wild. I used to collect old nokia phone. i mean yeah old things is outdated, but in build quality, they are Superior than nowdays stuff. Way better and easy to fix. Nowdays stuff is like one time use, broken = E-waste.

@d.k.9406 4 ай бұрын

Danke! Thanks! Just repeating previous comments: Nice job. Complex and complicated.. But a part of real world, fixing one problem to find the next or a new failure xd. Love this old machines! Try to fix modern smd million pins soldered ųc... noo wayy.. Extra ThankYou for deep and quality content!

@audioradiostereo8214 4 ай бұрын

Each series has its own characteristic ESR, the higher the ripple current, the lower the ESR. High quality, high price.

@Ale.K7 4 ай бұрын

Great! Looking forward for the other scope!

@johndevires5911 4 ай бұрын

Another "wild" one. Nice.😉👍

@edgeeffect 4 ай бұрын

Oooh... that table printed on your ESR meter is exactly what I've been looking for... :)

@TheBalconyWorkspace 4 ай бұрын

Grandpa ! The channel you subscribed finally updated ！🤣 Nice video as always !

@matyasnyilas 4 ай бұрын

"A massive bucket of salt" I'm dying 😭

@migsvensurfing6310 4 ай бұрын

Nice job.

@beatrute2677 4 ай бұрын

I was wondering when you were going to finish that off. That other scope looks like a beast.

@gianluca458 4 ай бұрын

1:44 WTF capacitor (The Orange close to the tesla IC) LOL

@Solder_it 3 ай бұрын

😂😂😂

@heno_3098 2 ай бұрын

WTF hybrid secret device :)

@andymouse 4 ай бұрын

Nice !.....cheers.

@AnnaVannieuwenhuyse 4 ай бұрын

Believe it or not, but the filter was actually installed the right way around! You're still right to suspect they'd install it any whichever way the wind turned it that day, though. And indeed, since many of these have capacitors on both sides, it matters very little. The capacitors from L/N to PE should be on the "output" side, as that is where the interference can be generated. If the capacitors between L/N and PE were on the input side, interference from the device would have to flow through the inductor which will not behave the same for all frequencies. Having the capacitors between L/N and PE on the output side provides the easiest path to ground for those types of interference. Furthermore, since this is a common mode interference filter (choke), interference on one terminal only (either L or N) wouldn't be treated the same! The filter will arguably behave better or more as expected the way it's fitted with the capacitors between L/N and PE on the output side, as it doesn't impact power factor as much due to not being directly connected to the mains. Net result for the oscilloscope, though, is the same. For the oscilloscope, it doesn't matter.

@TomboRectify 4 ай бұрын

10:04 The filter I salvaged from a plasma TV has those components but also another capacitor on the other side of the coils. I wonder what it's for

@weerobot 4 ай бұрын

Cool...

@tajtrlik1111 4 ай бұрын

Na toto video o dokončení opravy tohto osciloskopu som sa veľmi tešil, vedel som že bude ešte dokončenie opravy časovej základne, takže gratulujem k dokončeniu opravy tohto osciloskopu, teraz ti bude dlho verne slúžiť 😀. Na video (možno videá) o oprave BM566A sa budem samozrejme tiež tešiť.

@5Dale65 4 ай бұрын

At first I thought NN was for Not (k)Nown 😂

@Azaakiel20 4 ай бұрын

So complex!

@DiodeGoneWild 4 ай бұрын

Complex? Wait for the dual time base BM566A :D

@survivalboy9597 4 ай бұрын

Hello Sir ive seen your using the same amp meter from Voltcraft im having. Have you done a teardown of it ? Im asking because mine is broken, it shows an errow and the warranty is gone. So i was hoping you could give me some tips fixing it thx 😉

@brano2yt 4 ай бұрын

Its rebadged ut210e from uni-t, he made teardown 6 years ago.. kzfaq.info/get/bejne/o52Td8KImMm1nHk.htmlsi=sQCans2mDJJMJl4u

@celsoneves2368 4 ай бұрын

Jewel

@kokot_usaty 4 ай бұрын

Ten osciloskop BM566A jsem dostal od kolegy na radioklubu a pořád nemůžu pochytit jak s tím správně zacházet, mohl bys prosím ve videu o něm říct něco málo o tom jak s ním pracovat? Díky.