Meanwell

General hardware issues and troubleshooting etc

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Danoo
Posts: 249
Joined: Wed Jan 29, 2020 1:25 pm
Location: Queensland, Australia

Re: Meanwell

Post by Danoo »

The RPT-60B (Mouser No. 709-RPT60B) maybe a better option designed for both Medical and Industrial applications so hopefully better adherence to the specifications. I have not tried it, but did see an article a while back that it had been successfully used as an Amiga PSU.
Life is really simple, but we insist on making it complicated - Confucius
go0se
Posts: 399
Joined: Sun Nov 25, 2018 7:55 pm

Re: Meanwell

Post by go0se »

I have a large number of original Amiga PSUs that when used with accelerated Amigas give differing levels of performance and occasionally strange behaviour. I looked into recapping but as some of you know there are several different PSU case shell designs with even more internal PCB layouts so it quickly becomes a chore. Also, by this stage a lot of the PCBs have scorch damage due to failed components and more commonly, broken boards. That tends to be due to weak corners and with the PSU being dropped/kicked about over the years.

I decided to create a base board to mount the RT50B inside the original PSU case. This allows installation without any modification to the original housing (Because hacking up cases to accommodate mods is sacrilege! :lol:) More importantly it carries the supply over to the correct side for the Meanwell, routed on the underside for safety. There are some designs for that already out there but I wasn't happy with them for various reasons.

This design is to fit the shell for the later model 391029 (and others) rather than the DSP-A500 shown in @alenppc original post. The votage output is a nice stable 5V under load.

The RT50-B is also a late revision that according to the data sheet doesn't require any dummy load on the +12 and -12V rails. They could however easily be added if required.

The boards arrived yesterday, so, here are the results. If you don't see any more posts for me then there was a flaw in the design! ;)

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Steve
Posts: 2569
Joined: Fri Sep 15, 2017 11:49 am

Re: Meanwell

Post by Steve »

Damn that *really* is a nice piece of kit! :) Great design!
Karl
Posts: 27
Joined: Fri Nov 12, 2021 5:23 am

Re: Meanwell

Post by Karl »

I use a fake Meanwell NED-50A.
I think it is this one: https://www.makerb2c.com/product/50w-5v ... duct-2017/

I set it to 5.1V. That gives the TF330 close to 5V. I had 4.6V using an ATX PSU with some really bad cables and connectors.

It works great and creates no A/V noise. I had some video noise from the RGB to HDMI converter, but it disappeared when I powered the converter from the NED-50A, instead of using the included power supply.
alenppc
Moderator Team
Moderator Team
Posts: 903
Joined: Thu Nov 08, 2018 12:59 pm

Re: Meanwell

Post by alenppc »

I bought a meanwell RT65B now, and much to my surprise all the issues I had with the RT50b (original post) are gone.

Unlike the 50b, this one produces an incredibly stable output even when powered at 110V, and I even get 4.99V on an ancient A500 motherboard.

I don’t know if there are other issues but for the moment it seems to work fine.
Danoo
Posts: 249
Joined: Wed Jan 29, 2020 1:25 pm
Location: Queensland, Australia

Re: Meanwell

Post by Danoo »

Good to hear you found a solution.
Still using original hardware ATM myself no issues thus far, but I guess the old kit will eventually become wrinkly and I will need to find alternatives.
Life is really simple, but we insist on making it complicated - Confucius
T'PAU
Posts: 20
Joined: Wed May 29, 2019 10:46 pm

Re: Meanwell

Post by T'PAU »

@go0se very nice solution with this bridge/mount PCB! 8-)

A recently got an A1200 unfortunately with a defective PSU.

The first thing I did when putting in a MW RT-50B in the PSU case was, to flip over positions of the cables!
Means, the Amiga connection now is on the side with the switch, the power cable on the other side.
So no crossed cables anymore on the desk, as you normally position the PSU with the switch towards you (at least that's how I do it).

This is how I "fixed" the RT-50B in the case (no drilling, easy to put out). :D

MeanWell-Amiga02.jpg
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Only three wires instead of five (referring to OP) need to be extended.

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The final result. :)

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