Old bench power supply restoration (AUL210 from 1983)

Today, let's fix and restore a vintage bench power supply (AUL210 made by ZPA Košíře in Czechoslovakia in 1983). It has two adjustable 0-36V 0.2-2A outputs, two 15V 1A outputs and one 5V 2A output. An adventurous repair journey of a cool old machine :).
The 2nd episode:
• Old bench power supply...
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[@hazim38780]

Don't stop making "bloody long" videos. We all like them. Just keep going .... 🙀

[@SharvilSawargaonkar]

I fell asleep because of that Russian accent

[@mordypostcz]

@@SharvilSawargaonkar Czech accent, wake up Beauty ;)

[@SharvilSawargaonkar]

@@mordypostcz same thing

[@AchhcityNoob]

the editing time be like:💀

[@vaclavtrpisovsky]

23:43 Soldering on top of existing leads during repairs was actually encouraged by Tesla to prevent the thin PCB traces from tearing or detaching from the board.

[@Alchemetica]

Most enjoyable to watch. I love the old through whole component construction devices, reminds me of my teenage years when I was bodging together amplifiers from second hand salvaged components, tag boards and point to point wiring. As solid state devices took over I lost interest in building. Roll on part two.

[@CXensation]

That is actually a very fine power supply design. You have found a gem there ! Though it could use a couple of cans brake cleaner to remove accumulated dust and dirt. Switches should be cleaned with contact cleaner afterwards. Find some red plastic to insert in the lenses instead of painted bulbs - replace bulbs with the ones you have with lower current to avoid plastic lenses burning out. 0.5W 560 Ohm in series to match the 24V/20mA lamps for the 48V supply.

[@teslakovalaborator]

Tyristor v 5V kanálu slouží jako tyristorová ochrana proti přepětí. Tento kanál slouží hlavně pro napájení TTL, a tato ochrana v případě proražení tranzistoru, otevření smyčky vyšlusuje napájení celé sekce. Něco podobného můžou dělat ty velké tyristory na chladičích, s tím že reagují na proražení prvku a nebo překročení proudového omezení. To může být taky důvod, proč ti tam ty 4A pojistky vyšlehly. PS: Ta oprava žárovky, slušná prasárna! Mohl jsi odpájet od té miniaturní ty kontakty a připájet ji do těch starých když už.

[@DiodeGoneWild]

Jj, ten tyristor bez chladiče zkratuje 5V, a ty dva na chladiči jsou tyristorová předregulace pro ty nastavitelný výstupy. Napětí na těch 5000uF kondíkách je nižší, když se nastaví nižší výstupní napětí. Díky tomu regulační tranzistory nemusej vytápět tolik výkonu. Ta malá žárovka je moc krátká. Sice by šlo připájet na starý kontakty jen tu skleněnou část, ale hrozilo by poškození a taky by byla moc hluboko uvnitř. Když někdy seženu tu spránou, můžu tam dát správnou.

[@tiborbogi7457]

Radost vidiet cestinu. Ja som madar zo slovenska ;-)

[@hernancoronel]

Hi Daniel, it would be great if you could do some videos on ring testing capacitors! It seems to be a really interesting way to understand its attributes. Thank you for the video!

[@MassimoTava]

I remember him explaining it on past video, maybe someone knows what one.

[@hazim38780]

I think the name of his video was "DIY inductor/transformer tester" and his following videos whe he is also using capacitor ringing.

[@b-agc6143]

USSR times - everything in the East Europe was Polish, Czechoslovakian or Yugoslavian parts. But over all it was quite nice piece of engineering taking into consideration limited resources and access to "western" technology and parts. Great video!

[@petermikus2363]

Some people had commodore 64s and zx spectrums not a lot but some

[@NaoPb]

Cool power supply. Probably close to 50 years of dust in there. Great to see you repair it and to be able to learn from you.

[@mordypostcz]

I have got the same supply, it works for nearly 50 years. It seems in original state inside. It has some issues, but works. One fine tune wire potentiometer TP680 has gone and some bulbs too. The wide combination of outputs is unique, it is able to load power amps, opamps and logic from the one box. The design is simple as a hammer, even my dog can repair it ;)

[@omniyambot9876]

Power supplies are my favorite. BIG POWER SUPPLIES ARE BETTER. OLD BIG POWER SUPPLIES ARE PORNNN

[@pshq]

You have so many old components, it's amazing 😍

[@lmwlmw4468]

Ahahahah, they don't make them like this anymore, that's for sure...!!! Very nice video...!!!

[@Speeder84XL]

Really nice! I would never have expected that many components for a linear supply (more than many switching ones) and surprising it still worked as well as it did with that many capacitors that was complete trash, haha - but always nice with vintage stuff that works well.

[@ickipoo]

Well, there are at least five largely separate linear supplies in there, and they appear to quite sophisticated, with thyristor pre-regulation and current limits, largely in discrete components (although I thought I saw a metal can op-amp).

[@Speeder84XL]

@@ickipoo That's true. I forgot how many supplies there was - not just the 2 adjustable ones, but even the ones with fixed voltages. All of them seemed to work independently of each other as well - so they all need their own regulation circuit. That makes sense.

[@rfmerrill]

25:07 It's funny to call it "ring testing" because that is a term I've only heard for a way to check grinding wheels for cracks. An intact and safe grinding wheel will ring when suspended and struck, while one which has a crack in it will be dampened and will not ring. Very similar principle!

[@zx8401ztv]

Now that's a beast, it must have been in service a bloody long time. Built for reliability, not for high current. Hmm more pass transistors, bigger transformer and diodes/caps, no naughty thoughts lol.

[@AmatorElektronik]

16:20 polskie żarówki :-)

[@pepin2089]

More videos like this and longer please. Has always, good video.

[@Bata.andrei]

I am a big fan of russian MLT resistors. They are very rugged and quite precise. Those bayonet type lamps are made for telephone excanges. That is why they are 48v. They were used extensively on the operator panels of the telephone exchanges to notify the said operator that there was an incoming call on a certain line.

[@johncoops6897]

The lamps were 24V, and they weren't bayonet cap... so maybe pay better attention? These can be replaced with bulbs from incandescent Christmas Tree lights (Of suitable voltage)

[@lauraiss1027]

@@johncoops6897 Check 18:20

[@Bata.andrei]

@@johncoops6897 if you would pay attention, he was showing a bayonet type bulb, painted red. It clearly states "48v/50ma" on the side of it.

[@johncoops6897]

@@Bata.andrei - Well, I was referring to 16:00 which clearly shows the lamp is marked 24V. So, it seems we are both right! Neither the 24V or the 48V lamp is bayonet, they are "push in"... do you know what a Bayonet lamp base looks like?

[@Bata.andrei]

@@johncoops6897 you might be right. Back when I was an apprentice telecoms tech, I used to work on old crossbar and rotary type telephone systems. That kind of push in bulb, was colloquially know also as a boyonet among other telephone exchange techs. I never thought of it may be called otherwise, but that might be because in my native language it doesn't have another name.

[@MegaSunRise3]

I love the construction and the old components

[@vasekdvor]

Líbí se mi tyhle videa, ale strašně mě irituje, že si to ještě nevyfoukal, Danyku prosím tě vyfoukej to, už z toho mám vyrážku po těle :D :D @DiodeGoneWild

[@niemam5825]

Does your cat says "Where is the schematic diagram?"? ( ͡° ͜ʖ ͡°)

[@DiodeGoneWild]

It's on the internet ;)

[@retireeelectronics2649]

How to judge old electronics, lift it up and if dam heavy there is a excellent transformer in it. Nice video. The different screw lengths can be an old way to see if the equipment was opened. Who remembers which screw went where.

[@atoptip6193]

I am learning from you that a gadget can be fixed without the slightest attempt to clean it first!

[@DumahBrazorf]

Holy cow! this thing is built like it's going to the moon.

[@kalashnikov_47z]

Nicccccce

[@slimeedude]

Nicccccccce

[@kalashnikov_47z]

@@jim9930 This Powersupply is not *dodgyyyyyyy!*

[@artursmihelsons415]

Nice power supply! 👍 Great video, as always!

[@marcin-_]

Covid symbol at 21:37 at left down corner.

[@geoffreykeane4072]

Great video. I love the “Zap” button on the front of the supply. Next time I design something I’m putting one in.

[@MrTurboturbine]

A switched-linear power supply.

[@jirka2283]

I recommend to add antiparallel diode to each output. I accidentally shorted wires while having all outputs connected (I needed over 100 volts). Both KD502 were instantly damaged. Current limiter probably switched output off and it got negative voltage from other sections. In that state was on each adjustable output over 65 V (even on big 50 V capacitors).

[@KeritechElectronics]

Quite a cool power supply - nice for experimenting with solid state amplifiers :) KD503 are legendary, I like them a lot. That's a lot of FULL BRIDGE RECTIFIERS for sure! And an obscene quantity of electrolytics to replace. :)

[@antoniog.g256]

I wanna know, from where you find the components or from where you get them. Like capacitors, transistors....

[@PeterMilanovski]

Testing obviously bad capacitors is totally pointless..... But why is it that I love watching it being done??? I mean, someone could post a 4hr long video titled testing bad capacitors and I'm not doing anything else for the next 4hrs without question! But methods for capacitor testing on this channel are second to none! It's just not taught in school....

[@HIDLad001]

They aren't built like this anymore.

[@michalkana9764]

I love how these old czechoslovakian devices have symetrical component placement and great serviceability. I have osciloscope Tesla bm 464 and i was able to fix it without any tools.

[@cups3]

Very interesting 40 years in the electronic industry EVERYTHING was liner supplies when I started, but don't think I have ever seen one without a voltmeter . I would be nervous of a failure in regulation and at low voltage setting it would actually be putting out full voltage . (Scaredy cat) Thyristor on the fixed "might" be crowbar protection , if voltage goes above fixed , it shorts output and blows the fuse ?

[@DiodeGoneWild]

Yes, the thyristor with no heatsink is to short the 5V output if for any reason (internal failure or external backfeeding) the voltage goes above 6V.

[@d.k.9406]

Thanks for this information.. so he go further and make more and DETAILED explanations in even more bloody long videos

[@pritambissonauth2181]

Who made these TESLA components? Is the company still around?

[@mochamadwaysalqorni]

Great video. Please make more vid like this... I really love this kind of vid and diy project with explanation

[@madnessandescapism]

so, this power supply worked without half the components until you blew the fuses :)

[@Electronichub_05]

I just recently had some of these tesla electrolytic capacitors in a rft eo 213 oscilloscope and they all had cracks as well but surprisingly the ones in my other eo 213 are still fine.

[@matrixmodexp]

Could I donate a super complicated USB power supply?

[@mcflapper7591]

+1 for ringing out the caps! :) Did you already do a video on ringing out parts?

[@meepk633]

Those resistor markings are objectively better than color stripes.

[@daveamerion8177]

There is bloody dust sitting on it! If I were you, I would take a bath first

[@hnasje66]

lot of manual work in there, scarry that the output goes negative if the fuse is blown, can destroy your connected circuit

[@DiodeGoneWild]

Maybe it floats to negative only with a very high impedance at the output. And an antiparalel diode would probably be an easy fix.

[@westelaudio943]

How much corrent can it put out at the negative voltage though. 🤔

[@EJEuth]

Very nice to watch. Do you intend to draw the schematic? It would be great to see at least part of it, how this was done 50+ years ago, using these less usual (for us) parts and features. Thanks for sharing such great videos!

[@rilosvideos877]

Great inspection and analysis! What an effort for just a rather weak DC-powersupply and how many components! I have a Server-PSU capable of 6 kW power with 42V and nearly 150 Amps with very low ripple and half the weight of this one! But a traditional linear PSU is something else than modern switch-mode PSU 🙂

[@tiborbogi7457]

It's a 50 years old PS, build from very limited east block parts. At that time in czechoslovakia all electronics part were shortage and that PS was bloody expensive only for state owned firms. ;-)

[@mohammed_mohammed86]

"nicely dirty" DiodeGoneWild 2023

[@TESLA_KF507]

Tyto elektrolytické kondenzátory většinou bývají dobré, pokud jsou uchovávány v dobrém prostředí (což o těchto neplatí). Špatná bývá jejich starší série se zalisovanou gumou, která má však čepičku u vývodu. Ty vysychají.

[@supersussycat]

amazing, i'm just building linear PSU with 723 and old TESLA power transistors KU60X 👍 , that PSU was probably very good when it was new, i wish there was a schematic tho

[@supersussycat]

haha there is actually, they are using 723 for the fixed voltages and 2x741 for variable and ofc KD501,2, amazing, i love old stuff so much 🥰

[@krz8888888]

Tesla looks like the "Sprague" of the east

[@change_your_oil_regularly4287]

I love this old analog stuff 👍

[@garzhao5924]

Thanks!

[@isimisoko]

U have 'Iskra" capacitors in stack

[@MrPhantomFury]

23:17 Mr Carlson’s Lab has left the chat… 🤣🤣

[@debin83]

Waiting for next 👍🏻

[@hernancoronel]

Thank you for the video Daniel! Keep up the great content!

[@matusekpetr7806]

POOP RESIN :D Jinak mrkni na manuál k TSZ75, ten je dostupnej a i schemata, je to naprosto ten samej zdroj. Já mám doma TSZ, musím říct že to přepínání napětí je pecka, pozdější AUL zdroje s poťákama a ledkovýma měřákama jsou opruz na obsluhu, furt přepínáš měřák na napětí a něčím točíš, tady nacvakáš co potřebuješ a jedeš. 😉 Schema k TSZ jsem už dlouho neviděl, ale pokud se nepletu, ty tyristory jsou crowbar přepěťovky, ne řízený usměrňovač. Usměrnovače máš 3 složený z KY diod na chladiči, pro A,B a 5V zdroj, pro 15V zdroje jsou to ty diody na plošňáku.

[@edgeeffect]

Good that you didn't need to replace those 5000μ electrolytics... a new pair would NOT be cheap.

[@DiodeGoneWild]

I have several 4700uF 63V ones, if needed ;). They're not so expensive, about 2 dollars each.

[@erikziak1249]

17:11 LOL Your humor is genius.

[@ourplesoop]

Love seeing older gear brought back to life!

[@TraceTheFurry]

I really love old czech technology, but its really sad how it ended. For example old Czech Tesla.

[@DiodeGoneWild]

Yes, all replaced by cheap chinese rubbish products in the early 1990s when the the import started.

[@whatevernamegoeshere3644]

26:20 I messed about with capacitance and electrolytes for a while. If something is decomposing to release an acid, like an ester or a large alcohol, it will increase the capacitance as an electrolyte lol. I had a dried up 4700uF cap that was at 1200uF but it did 5600uF when I added 1% sulfuric acid in distilled water. It was garbage naturally because it ate like 5% of the energy lol. The more polar "mass" you add to the dielectric, the higher the capacitance but the trick is it needs to be an insulator. Afaik traditional electrolytes are alcoholic esters of borax which are large, polar molecules but don't conduct.

[@hullinstruments]

"BIG BITCH power supply" That's what I thought you said at the beginning of the video 😁😂

[@Godzilla941]

Got a good chuckle over the dodgy soldering, damaged traces and parts, and F instead of T fuses. I'm working on an old turntable right now that has the exact same things going on inside. (Can't get upset by it. We were all newbies once!)

[@cambridgemart2075]

That remote connector is a very expensive, military qualified, Hypertac connector.

[@EJEuth]

The SCR used as pre regulator is another ‘forgotten’ / exotic feature nowadays - not seen in several linear PS. It would be interesting to see it working (voltage measures at filter capacitor, under 1A load, for instance) to relieve power dissipation in the series-pass transistors, and how much noise it would generate in the outputs.

[@Sigmatechnica]

nice supply. looks of soviet origin, or made with parts of easturn manufacture at least

[@DiodeGoneWild]

It's made in Czechoslovakia, mostly using Czechoslovak components and few soviet.

[@kashifkhan5565]

yes please, Dont stop the video just keep going. Its better to watch one of your video than a 2 hour bloody lond movie. Sound doesn't matter too, as far as we understand we are good. Appreciate the effort.

[@LawpickingLocksmith]

Glad you care about the quality products built right near your home. Btw how is your cat? I think Louis Rossmann would pay you a million dollars for it?

[@TechGorilla1987]

@21:37 - Don't fret, my friend. You did a wonderful job here. I like the jumping content style.

[@cambridgemart2075]

If they are thyristors on the board, they would have to be GTOs (gate turn off thyristors); they are more likely to be transitors in a weird case.

[@d.k.9406]

Danke! Thanks! Want to see the next part :-) And as always Waiting for: More details+information Further analysis Complete(even bodged) repair And of course more bloody long videos Still learning from you

[@DiodeGoneWild]

Thank you ;) The next part is very close!

[@d.k.9406]

After watching again and checking the comments.... The blame came into my mind... I only appreciated your work.. But my Thanks also go to the person who donated this valuable piece of electronic. ❤

[@TechGorilla1987]

@2:07 - It's funny to hear the switch you're operating interfere with the camera sound. Cool.

[@keithking1985]

Class 👍🇮🇪💚🙏🏻

[@E-GaN]

Its kind of amazing how a board like xl4016 can limit the current up to 10 amp is smaller than this..

[@foobarables]

Nice how the power switch label reads ZAP.

[@DiodeGoneWild]

It means ON in Czech ;).

[@frogz]

damn...can you imagine being the guy who had to wire that beast? all of the thread wire wrapping is nuts

[@wraiths_]

Part 2 please...

[@mjouwbuis]

In the square box next to the fuses may be another bunch of paper caps that could go up in smoke.

[@CorvusTech]

at 23:56 the brown 270R resistor on the left seems to be cracked maybe it is damaged as well

[@Pirelli.]

Nice power supply! Great video and get well soon 🥭🍵☺

[@imnotbeluga007]

Bloody hell! That's one big power supply!

[@mspeir]

I'd love to reverse engineer the boards and remake them using modern components. 🤔

[@migsvensurfing6310]

Nice video. Thank you. It was interresting.

[@krz8888888]

Fantastic construction!

[@Broken_Yugo]

Looks heavy duty enough to be worth rebuilding and upgrading.

[@JB-ux5yb]

super video

[@adolfbenit9217]

この源、ポロンガの花は！！！😎👍

[@BritishEngineer]

The construction reminds me of military technology, so high quality and smart looking.

[@cocusar]

awesome video! have cold a fire extinguisher!

[@hichameham4124]

I would enjoy to be my lecturer in university just to listen to your wiiierd acceeennt

[@German_byte]

I like the cat’s perspicacious comment. 😀

[@andrezinatech]

Niiiiiceeee!

[@Ale.K7]

Nice power supply! Looking forward to the next part of the restoration!

[@tangoalpha8381]

🏆🏆🏆🏆🇧🇷🇧🇷🇧🇷🇧🇷

[@nil3010]

Man that is some nice design there Removable module is amazing

[@Lime902]

nice

[@Slawwwik]

Mám jeden, který je funkční jen částečně. Schéma nějaký mám a le čas... ten čas není 😀

[@giorgostexnikos6976]

amazing power supply.