Meanwell industrial PSU on my Atari STFM motherboard.

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Part of my STFM motherboard series.
I've previously recapped my Falcon's PSU and installed a custom-designed Exxos PSU in my STE, so, to complete the set of obvious retro machine PSU upgrade options, today I modify a Meanwell industrial PSU for my STFM.
I re-use the bracket from an old PSU, but find it hard to make the Meanwell fit accurately. Power switch and the IEC socket also have to be forgone.
Better than using an unmaintained original? Yes.
Better than a recapped original? No, but safer.
Better than the Exxos supply? Not by any measure, unless you're really pushed for price.
/ thetechnoshed
Meanwell terminal safety cover by zymurgic:
www.thingiverse.com/thing:467...
Video includes tracks "Going Bananas" and "Wakka Wakka" by Brian Teoh,
who I thank very much for releasing his music into the public domain.
PCBWay offer PCB manufacture, CNC machining, sheet metal fabrication, 3D printing and injection moulding: www.pcbway.com
Check out their new price reduction on 4 and 6 layer boards here: www.pcbway.com/blog/News/Big_...
0:00 Introduction
2:52 The Meanwell NED-50A PSU
5:32 Removing the bracket from the old PSU
9:39 Dodgy switch
12:25 Mounting decisions
18:12 Extending the ST's power cable
20:24 PCBWay offer
21:14 Crimping terminals
27:49 The mains connection
35:15 Final assembly
38:40 3D printed terminal cover
40:15 Checking voltages
44:40 Powering up the STFM
45:27 Looking for ripple with the 'scope
49:13 Summing up: the Meanwell NED-50A
References:
DSTB1: • DSTB1: 16MHz/8MB Atari...
PiStormST: • PiStormST: building a ...
Dual TOS switcher for STFM: • STFM Dual TOS: enablin...
Mandatory fix: bus pull-ups: • Atari STFM bus pull-up...
Exxos PSU: • Upgrading my ST with a...
Falcon PSU recap: • Atari Falcon PSU recap...
UK Plugs (Tom Scott): • British Plugs Are Bett...
My STFM playlist: • STFM
Exxos new-built replacement PSU: www.exxosforum.co.uk/atari/st...

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Опубликовано:

22 июл 2024

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Комментарии : 18

@gregcoons7308 Год назад

Nice video! I typically use the RD-35a as it is much more compact as it's easier to fit especially on the original bracket and inside a case. It also matches the output of the original PSU more closely. I have fit an RD-50a as well, just very snug and can't use the RF shielding.

@thetechnoshed Год назад

Yes, that one looks absolutely ideal!

@blackterminal Год назад

Do you need the rf shielding these days?

@njoy_9411 Год назад

Great stuff! I just got a 520 STFM that has the RD-50A installed, and like Greg said "...just very snug and can't use the RF shielding." It came without the shield, but has the standard power switch and IEC jack. BW's Technoshed

@Johnnii360 Год назад

The "swelling" 400V Cap must not be faulty. I also re-capped my 1040STFM PSU and removed the plastic thing after to see that the vent of the Cap is still good and not blown. This plastic cap is just for safety reasons in case the Cap really blow up to prevent more damaging to the rest of the PSU. But in fact the caps are that old it's better to re-cap all to give it a longer lifetime. :)

@exxosuk Год назад

More ST love, great stuff.

@dorinxtg Год назад

Loved the video! Do you plan to make another (small) video about adding a switch to this PSU?

@thetechnoshed Год назад

Many thanks. If I get fed up of pulling it in and out of the wall socket, I may. I’m still also irritated by the fact only one screw goes in. Too many projects, too little time, alas!

@blackterminal Год назад

Do you have a link for 3d printed Atari ST Case?

@thetechnoshed Год назад

No, I don’t believe anyone has published one yet.

@DeadCat-42 Месяц назад

Thanks, I have two 1040stf and a 520 st fm board that was hacked on by me as a teen I ordered one of these power supplies and am attempting to fix the damaged 520 . I'll probably put it in an old PC case and put all my mods on it. Leaving the 1040 s stock and original. Should I recap the motherboard?

@thetechnoshed 14 дней назад

I haven't recapped any of my motherboards yet, although the reset circuit can be a bit flakey after all these years and that big cap is ripe for a servicing. I would probably only concentrate on them unless you see a lot of jailbars or have other interference. The motherboards are quite delicate and I'd say pouring unnecessary heat into them is probably a higher risk than any of the smaller caps are.

@DeadCat-42 14 дней назад

@@thetechnoshed the big cap right after the ps was bad as usual. Some of the ones near the shifter were also slightly bad and got rid of the lines on the monitor when I replaced them . I bought the cap replacement kit from exxos as I was lazy about ordering and so I just replaced the ones I got in the kit.

@brianwild4640 Год назад

Crimp with the part near the handle the lug sticking out goes in the middle to squeeze the middle down

@thetechnoshed Год назад

That’s interesting. I’ll try that next time. So what are the coloured indents at the top for?

@brianwild4640 Год назад

@@thetechnoshed I will have to did my old pair out I was going from memory and my wire strippers have crimpers at the bottom like yours 3 sizes small to large 0.5-1 mm2,1.5-2.5mm2,4-6mm2

@blackterminal Год назад

Why is it safer than original? Should I recap my original if it appears to still be working ok?

@thetechnoshed Год назад

Old PSUs slowly fail losing regulation, increasing ripple or injecting voltage spikes. I don’t want to lose custom chips on my machines through a lack of maintenance. Especially on the Falcon.