Old bench power supply restoration (AUL210 from 1983) part 4

Рет қаралды 16,125

Жыл бұрын

Finally fixing this vintage linear bench power supply (AUL210 made by ZPA Košíře závod Děčín in Czechoslovakia in 1983). It has two adjustable 0-36V 0.2-2A outputs with thyristor (SCR) pre-regulation, two 15V 1A outputs and one 5V 2A output. I found and repaired the problem in the faulty 15V section. I also fixed an unexpected bridge rectifier problem in the other 15V section. Some more electrolytic capacitors tested and replaced. Adjusting the feedback PID to prevent unwanted oscillations. A leaking, shorting and exploding paper capacitor in an interference filter. Some oscilloscope measurements in the thyristor controlled rectifier section that pre-regulates the voltage.
The 1st episode:
• Old bench power supply...
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Пікірлер: 96

@electronixTech Жыл бұрын

That diagnosis using the sounds of the transformer buzzing was quite clever.

@PreetPal2107 Жыл бұрын

It's an experience who make technician work better

@BritishEngineer Жыл бұрын

I’d love to know more about the science behind this, more specifically how a normal transformer functioning fine makes a 100hz hum?

@shakeit995 Жыл бұрын

@@BritishEngineer Usually the iron core transformers use laminated sheets to minimise eddy currents, and I think the varying magnetic field vibrates these sheets a little, causing the noise. The sheets are usually welded together at a few points to reduce this as well as making sure the core actually stays together. Remove these welds with an angle grinder, and your transformer will make crazy loud noises

@AmigaWolf Жыл бұрын

I had the same problem with my solder station, it were also the diodes, the FBR 4 diodes. I replaced them all, one was burned, and yeah also strange sounds from the transformer, and i replaced all the caps with much better ones on put 2 fans in the solder station, now everything is working normal again.

@electronixTech Жыл бұрын

@@AmigaWolf Good repair. Glad it's working again.

@iamdarkyoshi Жыл бұрын

Wow, that open pin on the connector would have had me chasing faults elsewhere for a good while... Loved the interference filter at the end, pretty sure interference filters aren't supposed to make bubbles!

@michaelfisher9671 Жыл бұрын

Yeah, I don't think that interference filter is supposed to bubble out boiling liquid Something doesn't look right to me. I think it might be broken.

@johnwelbourn3811 Жыл бұрын

I'm glad we couldn't smell that interference filter roasting. That was a very enjoyable series of videos.

@Conservator. Жыл бұрын

Boiling, not roasting 🤓 (Im just being pedantic, please ignore 😉)

@Mark1024MAK Жыл бұрын

Yeah, the smell is not pleasant!

@user-ui6xt4fd1f 3 ай бұрын

Reminds me about... EVEN MORE SAAAALT!!! 😆

@noneofyerbeeswax8194 3 ай бұрын

@@user-ui6xt4fd1f MOARRR SAAAAAAAAAAAAAAALT!!!!!

@kolinevans9127 Жыл бұрын

That filter was medium rare .. just perfect!

@theoneohmresistor Жыл бұрын

ah i wanted to see the teardown of the sizzling interference filter :( learnt a lot from these series, keep on going!

@robertatpierpontbeach Жыл бұрын

Great testing of the interference filter; mine is always tested in the power supply while it's on. I enjoy your scientific methodologies; please keep the videos coming.

@antibrevity Жыл бұрын

Didn't realize that this was a cooking channel, but I hear bacon.

@florabee9283 Жыл бұрын

The open pin connection in the Darlington was bad enough to make the unit seem haunted, then the interference filter grenade!? Amazing!

@kd5byb 6 ай бұрын

Really enjoyed the cooking of the interference filter!

@essas.coisas Жыл бұрын

LOVED the filter in the very end - and of course super smart to use the vibration of the transformer :)

@bluerilius4362 Жыл бұрын

This channel is by far the most educational electronics channel I've ever seen, it's crazy how much information you know about diagnostics and repair of literally any electronics problems, genuine thanks for making such insightful and useful videos freely available for all of us to learn from :)

@hurryup1115 Жыл бұрын

Wow! The new image quality is outstanding!

@mrfrog8502 Жыл бұрын

This has to be the most overcomplicated linear power supply I've seen. Congratulations fixing it 👏

@xenoxaos1 Жыл бұрын

The thyristor limiting is genius before SMPS.

@RODALCO2007 10 ай бұрын

Great repair and that mains filter oozing out was awesome! Your measurements were spot on. That probably caused the Trag 2 Amp fuse to blow due to excess leakage.

@Conservator. Жыл бұрын

Fantastic old power supply, nicely restored.

@German_byte Жыл бұрын

16:08 such feline wisdom 😅

@kemalkurt5257 Жыл бұрын

Great to hear about regular updates on sunday. Also power supply and your diagnosis about it, is very good. Keep your work up.

@t1d100 Жыл бұрын

Excellent series.

@thisisyourcaptainspeaking2259 Жыл бұрын

I love repairing old stuff too, even though I have no plan for use. Can't resist the challange.

@beatrute2677 10 ай бұрын

Loved this vid series man. Just awesome

@makoveliprod Жыл бұрын

7:20 very old semiconductors often tend to open circuit, also sometimes a short circuit occurs when the first turning on after decades of inactivity, experienced this many times.

@astromancer Жыл бұрын

When you tinker with electronics so much that you develop perfect pitch

@FindLiberty Жыл бұрын

OUTSTANDING

@robertneill3057 Жыл бұрын

There's Schaffer filters available, but they are metal cased and have push on terminals at both ends of the case. There's a 3A one from Rapid Electronics in the UK. Will be subject to the board space dimensions if a replacement is decided upon.

@wolfrobben6914 Жыл бұрын

Great video, thank you! Especially the explanations on the 50/100Hz hum are quite helpful to me.

@DiodeGoneWild Жыл бұрын

Thank you for your support ;)

@teslakovalaborator Жыл бұрын

A tyhle překrásný odrušováky jsou třeba v osciloskopech BM5xx většinou připojený přímo k síti ještě před pojistkou :D Tyhle ohňostroje rovnou z těch přístrojů vyhazuju, možná přicházím o jejich výhody, ale rozhodně lepší než si opakovaně vydýmit místnost příšerným smradem odrušováku. Většina z nich už bývá dost načatá.

@tommozzarella2671 Жыл бұрын

Appreciate everything you do on here especially your easy to understand ways of explaining electronic circuitry! 👍👍 _tom

@diegofernandezsasso1000 Жыл бұрын

Nice video; interesting machine

@amkp40technology Жыл бұрын

20:52 Nice 😀😀😂👏🏼👍🏻👍🏻🔥

@makoveliprod Жыл бұрын

20:51 even more salt

@cadbury204 Жыл бұрын

Thanks

@DiodeGoneWild Жыл бұрын

Thank you ;)

@stevenbliss989 Жыл бұрын

A uni-directional dimmer circuit for PWM pre-regulations - BRILLIANT!!!!!!!!!!! Not so great for interference, which explains the filter that surprised me! :)

@ohmware2020 Жыл бұрын

cookfest is real, 😁 , nice video as always!

@Alexelectricalengineering Жыл бұрын

Awesome 👍👍👍

@Speeder84XL Жыл бұрын

Interesting! And nice surprise the at the end with that interference filter spewing out boiling electrolyte, haha

@DiodeGoneWild Жыл бұрын

It's not an electrolyte. I guess it's some oil or wax. Hopefully not PCB.

@KeritechElectronics Жыл бұрын

Whooooa, that'd be a RUD on that filter. Micely repaired.

@jonlitchfield8888 Жыл бұрын

I like yr content so so so much

@andymouse Жыл бұрын

Nice ! and with a good amount of salt.....cheers.

@Ale.K7 Жыл бұрын

Nice!

@LMB222 Жыл бұрын

I've built my first power supply with those diodes with blue ring… must have been 1983?

@milantrcka121 9 ай бұрын

What an interesting series! Complex laboratory power supply, decent design for the times, nicely built, and totally fixable. Good troubleshooting. Danyk, thanks for the memories of TESLA components. Off hand, are you familiar with early eighties Polish Meratronik V640 electronic multimeter ? Fixing one right now. Eastern European electronics is fun...

@DiodeGoneWild 9 ай бұрын

Thanks :) I don't know V640. From Meratronik, I only have the V541 voltmeter.

@LucasPereiradaSilva Жыл бұрын

Interference filter starts leaking on camera: "Naaaaaiceeee!!!"

@Purple431 Жыл бұрын

Diodes!

@worldcitizenoss Жыл бұрын

Thank for the clear explanations. I wonder where the liquid of the interference filter came from? Accumulated moisture in the interference filter?

@iaaqob8318 Жыл бұрын

Looks like boiling wax from the paper capacitor perhaps. Would be nice to make an autopsy video of it :p

@douro20 Жыл бұрын

The renowned Czech optics maker meOpta was once part of ZPA.

@gordonwelcher9598 Жыл бұрын

I see a lot of wonderful Tesla component in this piece of equipment. Fortunately they are not used very often in North America. However these ones seem to have lasted at least 30 years. I once bought some 60 watt Tesla light bulbs. They lasted about 4 hours.

@DiodeGoneWild Жыл бұрын

Lamps lasting just 4 hours? They should last much longer, unless they are special super hot filament photo lamps. Or they might have some air already leaked in.

@AndyHullMcPenguin Жыл бұрын

That filter reminded me of a sewing machine I looked at around a year ago when visiting my wife's cousin and her husband in Germany. We had the thing in bits and were trying to figure out why it had started to run slow, accompanied by a slight smell of "hotness". While leaning over the opened base of it, the somewhat similar mains filter block decided to let me know what the cause of the issue was by exploding very loudly. It emitted a huge cloud of acrid smoke, while showering me with hot wax and indelible brown goop from the filter capacitor (thus ruining my T shirt). For extra pyrotechnical points, the coil, which was apparently red hot, then burned a small, neat, round hole in the table cloth. For some strange reason, I and my German host found the whole thing hysterically funny, but I'm not sure the ladies where particularly impressed. Maybe ensure you have your eye protection on next time you boil one. Just saying. ;~)

@app0the Жыл бұрын

Similarly one day I bought a studio reel to reel recorder, it was listed as "working", but also weighs over 100 kilos. And before the seller left my house I said I wanna test it. "Luckily" the filter was on the verge in a similar way, so when I plugged it in something inside exploded with a lot of smoke filling the room and the breaker tripped. At that point I didn't yet know what happened but couldn't help asking the seller if they'd rather give me a 50% discount, or carry the 100 kg beast downstairs back to their car, and they gladly accepted the former ;-)

@mohalothman99 Жыл бұрын

happy end of this series with a lot of drama between 😄

@andrezinatech Жыл бұрын

Niiiiiiiiiceee!

@tajtrlik1111 Жыл бұрын

Gratulujem k dokončeniu opravy zdroja, nech ti pekne slúži. Ten konektor v čase 3:30 by sa podľa mňa po odvŕtaní nitov nerozpadol, ja mám takéto konektory nakúpené ako nové, len nie sú pozlátené a sú to jednotlivé kúsky po 12 pinoch (nie takto mechanicky spojených viac 12 pinových sekcií) a držia pekne pokope, používam ich do niektorých bastlov čo vyrábam, hodia sa k tým ostatným retro súčiastkam, ktoré taktiež v svojich prístrojoch používam.

@Pulverrostmannen Жыл бұрын

aaaaaand the magic smoke was released lol

@BobT36 11 ай бұрын

Fucking LOL I was sat expecting that "Niiiiiice".

@luislopez-pf5fi Жыл бұрын

Hola!

@amkp40technology Жыл бұрын

❤️❤️❤️🙏🏻🇮🇳

@ebrahemaswed1744 Жыл бұрын

Creative teacher your metal detector Creative teacher your metal detector diagram 🙏

@shamy6346 Жыл бұрын

We wait impatiently

@shamy6346 Жыл бұрын

مرحبا استاذ كيف يمكن الحصول على مخطط كاشف المعادن بتخطيط اسهل انا مبتدئ ومتابعك تحيه طيبه

@NaoPb Жыл бұрын

To think of what your house must smell like now. Or does it not smell so bad with the liquid escaping?

@DiodeGoneWild Жыл бұрын

The smell disappeared after opening all windows for half an hour ;).

@FJL4215 Жыл бұрын

@@DiodeGoneWild I had one of the RIFA paper caps go off suddenly with a woosh and white cloud of smoke. Even after turning it off within 2 seconds, my room smelled for days :O It was not NIIICE. :(

@sammin5764 Жыл бұрын

🌟🌟🌟🌟🌟

@nikiamz6501 Жыл бұрын

Cooking emi filter

@yaksvk 5 ай бұрын

Can anyone please point me to the explanation what is ring testing and what does the ring testing (red device) with the LED counter do? Google searches seem to point me to something completely different.

@noneofyerbeeswax8194 3 ай бұрын

The “ring” tester measures the Q factor of an LC circuit by counting the number of oscillations (“ringing”) after one initial impulse. The higher the number, the less lossy (i.e. less resistive) it is.

@yaksvk 3 ай бұрын

@@noneofyerbeeswax8194 thanks thats a very elegant and concise explanation! So I suppose you would ring-test a circuit to see if there are unwanted oscillations in this case.

@noneofyerbeeswax8194 3 ай бұрын

@@yaksvk Well, in this case 20:20 you actually WANT a high number (tens) of rings. The ‘5’ here may indicate one of the following: 1) Shorted turns in the inductor (low inductance = low Q) 2) High series resistance (bad contact or really thin wire) 3) Relatively low resistance in parallel with the LC circuit - which is indeed the case here. As we know, a paper capacitor arced over and turned into some sort of carbon resistor with ill-defined parameters. :) The main use of this tester is finding faulty components like these. A good transformer or inductor should ring a lot when triggered by a single pulse, but if there are shorted turns or leakage, the oscillation shuts down quickly. You could use an oscilloscope for the same purpose, but having it all in a small box is more convenient of course.

@yaksvk 3 ай бұрын

@@noneofyerbeeswax8194 this is like a year's worth of school knowledge condensed in that comment! Thanks!

@noneofyerbeeswax8194 3 ай бұрын

@@yaksvk 😊You’re flattering me. If you want to ask some more questions, you’re welcome.

@thisisdvd8094 Жыл бұрын

17:35 windows

@GodLike-pe6kj Жыл бұрын

When a capacitor reads low (using a multimeter) it is probably leaky. The Multimeter reads capacitance through measuring the time constant, which gets longer when the capacitor is leaking, hence the higher capacitance reading. In my personal opinion, if a capacitor measures more than ~10% over its nominal value, its probably bad.

@mrnmrn1 Жыл бұрын

Electrolytic capacitors usually have a tolerance of +/-20%, so 10% high is perfectly fine. Vintage electrolytic capacitors sometimes had weird tolerances, like -10/+80% for big filter caps, so almost double the nominal value is fine in the case of some vintage capacitors. They done this for reservoir caps, for two main reasons: they intentionally made it higher capacitance, so it will have more headroom for aging, and also for ease of manufacturing, they probably aimed for +50% of the nominal value, but whatever came out, was most likely in the -10/+80% tolerance range, so they rejected only the really bad ones, which caused a better yield, less production loss. If excessive leakage current is a concern, it should be measured with a current meter, after the capacitor is precharged to its nominal working voltage.