I'm getting REALLY ANNOYED with the misinformation Jens is spreading on Twitter in response to this video. So here's a few points: Jens claims Meanwell's are bad, but original Commodore PSU's are good. What he doesn't mention is that for most of the PSU's Commodore shipped - They are EXACTLY THE SAME TOPOLOGY. The only difference is the Meanwell's use more modern controller IC's, and probably a higher switching frequency. They also implement undervoltage lockout, and overvoltage shutoff - which none of the original C= ones did. He claims that the Meanwell's do not compensate for voltage drop in the cable. That's correct... but NEITHER do the original C= PSU's. If they did, they would have an extra wire on the +5V line for remote sense. One or two of them even have a preset pot inside for adjusting the +5V output - exactly the same as the RT-50B and RT-65B do. Jens's design doesn't have remote sense either. He is "faking it" by measuring the current draw on the 5V line *at the PSU* and then boosting the voltage when more current is drawn. That works fine assuming he has characterised the voltage drop of the cable on the PSU, but here's the thing - the cable drops negligible voltage. Most of the loss is happening in the pins of the PSU connector. The only thing that helps with this, is contact cleaner. He claims that the regulation feedback from the Meanwell's is not accurate because it's not on the +5V line - IT IS on the +5V line. He is thinking of ATX PSU's which quite often only take feedback from the +3.3V and/or +12V rails. The Meanwell's also use the same TL431 voltage reference IC that countless PSU's, including all of the "off line" switchmode supplies that Commodore shipped. He's claimed that Jan's PSU connecting the shield ground to mains ground is incorrect. Guess what - that's exactly what the original Commodore PSU's do as well... want to confirm that ? Get a multimeter in continuity mode, put one probe on the outer shield of the Amiga plug, and another on the Earth pin of the mains plug. It will beep and show practically 0 ohms reading. Finally, he says the ripple and noise of the Meanwell's is not good enough for Amiga use. This is demonstrably untrue... recently "Retro Theory" has done just this on his Twitter account. They meet or exceed the ripple and noise produced by the original Commodore supplies. He claims people who have done this test have only done so off-load - Retro Theory has clearly done it on-load with an Amiga attached, and I have done it by loading the power supply with high wattage resistors. Retro Theory's test is better as it shows the response with a dynamic load. (I say "Commodore" supplies - but Commodore had nothing to do with them, they are all subcontracted. All Commodore specified was required voltages and minimum required currents. How the subcontractors did that was up to them. There were several vendors - off the top of my head: Speedy-Tech, ISMET, DCD, DVE, Phi-Hong. None of the designs were anything special, and a few of them were dreadful!)

Me: "Jan should just use a piece of paper to work out the screw spacing." Jan: "I have this piece of paper I found" Me: "YAY!"

Dude your drilling technique is scary😂

A past sin revisited and rectified. :) That new case does look so much better, and I see no problem with a mostly new unit not masquerading as an original part. If I ever decide to take the plunge and build a PSU, I'm definitely revisiting your videos first. Thank you for sharing your knowledge and experience!

Sitting here at 4am, a stomach bug got me. Sipping a hot chocolate and watching Jan. I feel better now lol Great video Jan!!!

Never apologize for doing the work you love.. great build Jan

very nice build! May I suggest that you check that earth connection actually made it to the metal frames themselves? Unless I'm mistaken you checked continuity to the screws but there is a small chance that the metal (painted) cases are actually not making contact with them. Unlikely but better safe than sorry! :) You'll have to scrape the paint on a hidden corner to check. Thanks again for the nice video!

Excellent job Jan. Looks fantastic and performs as well!

Great video. I've been deep in Commodore power supplies for the past few months so your timing is impeccable! 🤓

This looks great now! I also have a project box, having the same switch and a very similar Meanwell power supply to yours and it's working very well for my own Amiga.

Wow, you've got SO much more patience than I ever had! Interesting, as I might also give it a try next time..

The icomp psu was my only option to run my a1200 ppc with bvision, SubwayUSB ect stable. Original C= psu began to shut off my system, atx psu damaged the Subway Controller, the system refused to start with another meanwell-based psu (but worked with my unexpanded a500) A neverending story. For me the icomp psu solved my problems. For this built: looks very nice👌 Great work!

It looks very nice, very professional. One of your best yet I think. 😊👌

If only those Bahar enclosures were available here in the USA. However, I did make my own Amiga power supply with a plastic enclosure and the same Mean Well RT-65B. I didn't have an original PSU to start with, so I used a square DIN connector that I bought off of Ebay, some vehicle trailer light wiring for the DC side, a normal toggle switch from the local auto parts store, and a power cord from a dead power strip for the AC side. It worked perfectly, thanks to Jan for his videos!

Very neat build. I liked that you made the ground as a continous chain.

The backside of the plastic plates have grid pattern on them, quite useful if you want square holes that aren't at an angle.

Very neat PSU build, you're definitely getting better at these ;)

Great job Jan! You are the "emperor" of power supplies ;-)

You make me nervous dremelling without safety glasses. Part of the fun of your videos. ;)

What a power beauty with a boing on top! Nice job.

very nice work, very nice power supply, and once again a very nice video !

Love your work Jan! ☺

Nice, though I would probably have put some rubber (or plastic) pad/feet between the PSU and the case for vibration dampening and avoiding that "tin" sound if you tap the bottom. Not really important, just a very minor Quality of Life tweak you can do at any time.

Nice looking power supply. Much better than the original one. Well done Jan.

Great project. Huge improvement.👍🏻 Greetings from Hamburg✌🏼

Ooooooooh! Precisely what I want to do as well. Thanks Jan!

Jan,ho sempre detto che sei un genio,sei una persona molto precisa,e l'alimentatore AMIGA ne e' la conferma,il lavoro e' eccellente

well done Jan Beta really great video very entertaining i love watching your channel

Great follow-on to the prior video! I bought an inexpensive manual (not electric) nibbler a while back and haven't used a Dremel since for this kind of work :)

Cool looking PSU. :)

I did the same to my Amiga CD32, i also put a Meanwell PSU in a old Amiga 500 PSU housing, but i bought a Meanwell PT-65D that is one without a metal housing and has heatsinks, that fit's MUCH better in a housing, like a Amiga 500 PSU housing, and is cooler.

Finally this PSU project came out really nice! I also like this case, looks very decent and solid.👌 Maybe I'm going to build a double PSU like this for my Atari 520 STM plus SF 314 Floppy, we'll see. 😉

Your build skills have for sure improved over the years, I'd say your earlier builds look like "Bastelwaren", this one definately has a nice "German" look and looks like it came out of a factory.

I think my A1200 PSU is on its way out, it keeps freezing until it warms up for a few minutes. So, I think I'll be doing this build soon. Not sure to re-use the PSU case or buy/print one. Oh and a couple of step drills are among my favourite tools - I can't believe I didn't get them sooner. Great work Jan.

Amazing job.

Love it!

Good job.

I built a new computer a year ago. I needed a dremel and a drill for it. I bought dual 360mm radiators. The top one didn't fit because the hole was too small. So I dremeled it out. But then the water pump had no place to attach so I drilled into the hard drive cage. It turned out really well. At the same time I drilled into my C64 so I could finally have a proper mount for my VIC-II² switch. Also turned out well. Surprisingly the plastic on my C64 is in amazing condition. It's very soft not brittle. The dremeling of the case though, that took 2 cutting bits. It's a thick steel case. If I needed to do anymore I would have used a 3rd as the 2nd one was pretty dead. lol Also I didn't have a stepper drill bit so I just started small and kept going bigger and bigger until everything fit. lol

I'm using the same PSU for my A1200. I had a longer lead to the Amiga and practically no load on the 12V which floated the 12V too high since I had to adjust 5V a bit higher to compensate for losses so that I still have 5,0 volts on the computer board. Fixed it by jumping the +12V out via a beefy diode to the NC terminal, added a load resistor from NC to COM and took the +12V out from the lowered voltage NC terminal. I expect the 12V goes up more and more as you load the 5V with more amps and the switcher does more work.

And as so often - black just looks good :)

I fitted a similar Meanwell PSU inside my Commodore 1541C drive last year, the linear supply was just insanely heavy and ran hot when idling (mostly trying to get it to work with VICE with a driver that windows refused to install), with the new one, it's light and runs cool, still have the original PSU stashed away though, just in case I ever needed to refit it... :D

Buen trabajo, saludos, Tony

Very nice.

Hey Jan, will you put the old box on ebay and have it signed by you?

Had for a long time a ATX PSU with a nosy fan. But now for 2 years a iComp CA-PSU. Have four of them for my A500 and my three A1200’s. Have to many money in my A500 and A1200’s. Do the safe way and not the dumb way such as my old ATX PSU.

Step drills rock.

Beautiful power supply Jan Beta. I would have gone black m3 nuts and bolts for the earth strap. Just to match the case.

Hi Jan. Great vid. Your 'pokey-bit' is called an Awl (pronounced 'all'). Keep up the retro fun ;-)

How about a little black paint on the silver ground screws? Nice job. You should see how I hacked an ATX power supply into my Amiga 4000, long ago before I knew about the Meanwell.

If it's wrong to love step drills, I don't want to be right.

Hi Jan, thanks for the video, great as usual... I've seen many people fitting those Meanwell power supplies inside the original enclosure instead of trying to fix the original circuit so I have a question for you - is that really so hard to fix the original Amiga Power Supply circuit? I'd love to find a tutorial on how to properly do that and keep the original psu circuit board.

Great video, Jan! I'm thinking of building a universal psu for my retro computer stuff. Basically one psu with all the appropriate voltages and a couple of generic utlets, and then different power cables for the computers. :)

Should use some "star" washers underneath the screws securing the power supply. The washers reduce the screws' loosening from vibration and cut into the paint for an improved connection to the metal.

cracking build...........maybe a video of cleaning that joystick 🤣🤣🤣

I had just watched this video, and later that same day my A1200 power supply (aftermarked) died on me. So good timing! The Bahar case company does not ship to north America. Does anybody know of a good enclosure available?

Again really nice work! But why don't you build one universal power supply having +/-12V, 5V, 9VAC (and maybe 3.3V?) and connectors with all these voltages at the front or back of the housing? Then you just need to build a matching cable for the different systems and the power supply could remail on the shelf in front of you.

22:00 ... but... but... there are some of the connectors you are looking for, in the top left compartment of that box...! or are those the wrong size?

Hmm, thats a strange IEC inlet with fuses in both Line and Neutral. It is generally redundant to fuse the Neutral, the only time you would really require this would be if your 230V supply was actually split phase i.e. both line and "neutral" are 115V 180 degrees out of phase (as it may be in the US for example). This generally doesn't happen in 230V countries, and Neutral is at "ground" potential. Still, it doesnt hurt :)

Looks like no stranded wire for the mains switch? If so that’s definitely no recommendation from me. Unfortunately it’s hard to tell since assembly is always fast forward.

Wow...

7:28 2A would be the max input @100V (Japan) - fusing a 65W supply with 3,15A for 230V (=725VA) seems a little off, although the data sheet mentions an inrush current of 50A at cold start.

Let´s face it: the "shielded" Meanwell Rt 50B/RT 65B is a little too big to fit in an original Amiga Powersupply-case. An RPT 65B is unshielded but quite more compact. This model delivers the same voltages (with a little less amps on both the 5V and 12V lines), but it is still much more you will ever need for your Amiga. The main advantage over the Rt 50B/RT 65B is, that the RPT 65B fits into that kind of case without issues. If you have a 3D-printer, there are even some stl-files for an adapter plate available from thingiverse to fit them easily into an original Amiga powersupply-case...Since I have my "Tannenbaum"-drill I only fit round-shaped switches or plugs into my cases :)

What size enclosure are you using ?

Hey did one too Jan.

One thing I wish the A500 had was an internal PSU like the Atari STf/e and Falcon030 had. But then, with how shady some of Commodore's electronics were, an Internal PSU might have been inviting disaster.

what size enclosure is it?

Shame Bahar dont ship to the uk from the eBay site

You seem to like to use single-pole switches, I have seen you use those in previous builds. Would be best to switch to two-pole ones (4 terminals) that break both wires at the same time, since our wall plugs (we use Schuko plugs in spain) are not polarized so there's no assurance that L and N are actually L and N.

Nice ! Very neat. My version uses a mini-itx power converter in a box and an external generic "laptop style" 12V supply, seems to work very well. I actually have no idea why people persist with the original supplies or pay so much for ready made "new" ones - pretty simple to make as you have showed, all you need is the specific plug for the amiga end and some really low cost parts :)

So the first power supply was still true to the "Jan Beta Was Here" tradition :) I'm sad we don't get more of these anymore :)

I would like you to measure and compare ripple from Meanwell and original Amiga psu. Jeas from Icomp constantly warns about it, and fact is that some ACA accelerators works unstable with Meanwell. It would be nice to know this for a fact finally.

18:13 Help me step drill. I'm stuck!

that sticker reminds me of mad balls

Winner Winner Chicken Dinner

A tip for directly drafting onto the material, put some painters tape down and draw on that. If it's not what you want then just take the tape off and put some fresh tape down. Once you have what you like, you can also use a knife (or your calipers) to cut the tape where the hole goes. When cutting and filing the holes in the material, leave the tape on and use the tape holes to get the cut edges straight. Cheers,

Nice build, but a few notes... At the end of the day if one needs to buy a case in addition to a Mean Well supply, it's probably less expensive and more convenient to buy a completed aftermarket finished supply that uses a similar Mean Well, like the ones from Electroware. If you already have a case at no cost such as re-bricking the A500 PSU case, then the Mean Well RPT-60B has great specs and is much smaller than the RT-65B, intended for putting inside a plastic shell.

He said he was going to edit out all the swear words, so how much longer would the video be with all the swear words left in?

You could build a little cottage industry for yourself with these power supplies Jan! :)

Dood somehow this kind of reminds me of going to the dentist.

So you made it worse by ditching the original case? 😁

Not too old...

oh my god jan..... there is the top left box is full of female spade connectors !!!!!!!!!!

look at the ripple. :(

BETA Industries strikes again 🌝

I wish the cord was black not beige.

First 😂🍻

Looking at you use pens and other Drawing implements triggers me... Please learn how to hold a pen properly. It will save your hands.

WHY have you got BLUE as ground??????? it should be green / yellow.... blue is neutral in the UK.....