Modern Amiga PSUs: deeper than a rabbit hole!

[YouKnowWho]

@atomontage - I'm not sure there is any risk to be worried about. If the only issue with MeanWell is that the 5V drops slightly to adjust to 12V demands, I'm not sure it is such a concern. Please correct me if I'm wrong, because as I have stated before, I'm no expect on matters of power supplies or electronics. I simply know that the spec on the A500 PSU is 5V +/- 5%, which puts us at 4.75V floor on spec, and @droopy measured 4.7V for a blink at worse. I don't think this will cause an issue. Also, I have never experienced a hardware failure because voltage was insufficient. I did toast a floppy drive by plugging the power in the wrong way once, but never because the power was too low. Perhaps the system may hang, but then again I've seen it hang with the original Commodore power supplies too when devices maybe strained the PSU and suspected voltage dropped.

If the risk was voltage spikes, OK, we should all be worried. But voltage drops? No worries! ...outside of the fact that it will happen when you're the furthest you've ever made it in a level. Or when that large 3D render is nearing end.

I've also had my Mom disconnect me on a number of downloads at 80%+ by picking up the phone, but that's another story.

 

[Cloudane]

Hi, I appear to be down said rabbit hole!

It’s an interesting one - I got a SCART splitter (buffered one from JS Technology) so that I can have one picture on CRT TV and one to OSSC for streaming

I noticed that when I use it, there’s a noise/ripple effect that slowly moves up the picture repeatedly from bottom to top - initially I blamed the splitter but it’s only if I use the Meanwell RT50. If I use the A600 PSU, the noise goes away. This is whether I use my A500 or A1200 so I guess it’s not the Amiga’s caps. If I don’t use the splitter it doesn’t happen either. The combination is pushing the whole thing off the edge I guess.

Not sure what conclusion the thread came to - maybe CA-PSU being the way forward?

 

[bdb]

Hi, I appear to be down said rabbit hole!

It’s an interesting one - I got a SCART splitter (buffered one from JS Technology) so that I can have one picture on CRT TV and one to OSSC for streaming

I noticed that when I use it, there’s a noise/ripple effect that slowly moves up the picture repeatedly from bottom to top - initially I blamed the splitter but it’s only if I use the Meanwell RT50. If I use the A600 PSU, the noise goes away. This is whether I use my A500 or A1200 so I guess it’s not the Amiga’s caps. If I don’t use the splitter it doesn’t happen either. The combination is pushing the whole thing off the edge I guess.

Not sure what conclusion the thread came to - maybe CA-PSU being the way forward?

You could ask Jens in his iComp.de Forum, he takes a day or so to respond, but he will.

 

[Aeberbach]

I'm printing a case for RT-65B right now as it happens. Datasheet says:

Looks like the minimum load will be met by the Amiga according to Mean Well's advice on calculating minimum load. I do not believe ripple is a problem at all, I've used these supplies a lot.

 

[fpmpaolo]

I noticed that when I use it, there’s a noise/ripple effect that slowly moves up the picture repeatedly from bottom to top - initially I blamed the splitter but it’s only if I use the Meanwell RT50. If I use the A600 PSU, the noise goes away.

Did you put a DC/DC converter in order to get a stable +12V when you raise the +5V?

What voltages do you have on the FDD connector and on the RT50?

 

[Aeberbach]

My Amiga PSU case is now on Printables, if anyone wants to use a RT-65B.

 

[YouKnowWho]

@Aeberbach - Couldn't you embellish it a bit with an AMIGA or C= or both?

 

[Aeberbach]

I don't love the look of embedded logos or text, especially not in PETG where it can provoke heavy stringing. Less scary when I have a proper workshop with heat gun to clear that up but here I don't... there's lots of room for a sticker though.

 

[arnljot]

I don't love the look of embedded logos or text, especially not in PETG where it can provoke heavy stringing. Less scary when I have a proper workshop with heat gun to clear that up but here I don't... there's lots of room for a sticker though.

The guy on YouTube has made a small hole where a logo printed separately can register and be glued in.

It's just a round hole that the printed logo wil use to register correct symmetric placement