Questions about MeanWell RT65-B

[WhereIsTheParadroid]

left to right

+5V - gnd - gnd - +12V

Very easy.

Can I ask you advice on something? I finally got around to testing the outputs from the MW. When measured at the power supply, The 5v rail is dead on. The +12 rail is +11.07v and the -1 2v rail is -12.02.
I don't want to open the Amiga up again, I've spent a lot of time inside my A600 this year (fixing other issues) so am hesitent to open it up again if it's all good anyway.

 

[fpmpaolo]

Can I ask you advice on something? I finally got around to testing the outputs from the MW. When measured at the power supply, The 5v rail is dead on. The +12 rail is +11.07v and the -1 2v rail is -12.02.
I don't want to open the Amiga up again, I've spent a lot of time inside my A600 this year (fixing other issues) so am hesitent to open it up again if it's all good anyway.

I'm not a pro but...
I think 11.07 is a little voltage for even a plain A600 with KS 2.0 and floppy.
Try to screw the potentiometer on the MW a little bit and raise the 5V.
Which MW do you have?
I know opening and closing the tiny case of the A600 is a pain in the neck but trust me: it's better to give right voltages.
If I remember well, 12V is used for video&audio so it's better to pimp it up a little bit.
Furthermore, the more you expand the Amiga, the more it needs power so...
I became nuts preparing the DC-DC thing but trust me: once you got the job done, you'll forget all the hassle.

Last but not least...read what I like to call the bible of Amiga PSU

FAQ

What voltages should the +5V, +12V, -12V rails be at?
±5% of the nominal line voltage, or in plain English:

+12V

lower limits 11.4V

upper limit 12.6V

I managed to have 5.10 and 12.10 measured on the floppy on my Vampirized A600.
That's to say "in medio stat virtus"! [sorry don't know the english proverb for that!]

 

[WhereIsTheParadroid]

I'm not a pro but...
I think 11.07 is a little voltage for even a plain A600 with KS 2.0 and floppy.
Try to screw the potentiometer on the MW a little bit and raise the 5V.
Which MW do you have?
I know opening and closing the tiny case of the A600 is a pain in the neck but trust me: it's better to give right voltages.
If I remember well, 12V is used for video&audio so it's better to pimp it up a little bit.
Furthermore, the more you expand the Amiga, the more it needs power so...
I became nuts preparing the DC-DC thing but trust me: once you got the job done, you'll forget all the hassle.

Last but not least...read what I like to call the bible of Amiga PSU



I managed to have 5.10 and 12.10 measured on the floppy on my Vampirized A600.
That's to say "in medio stat virtus"! [sorry don't know the english proverb for that!]

This whole time, I thought I had the 52b because I've covered up the stickers but no, it's a 50b. A diferent beast so no wonder I'm getting different values. Also, my A600 has been working A-OK with just a floppy and external go-tek.
I should check the voltage going into Paula (which needs around 12v) .. but it's wotking!

"in medio stat virtus" indeed!!

 

[Timtheloon]

@scrappysphinx came through for me and sent me the Meanwell but its not a RT-65B but a RT-50B I used the Amiga PSU tester and the voltages seem good apart from the -12 seems high

Anyway here are some pics including the voltages

PSU



PSU internal sorry not the best pics




5v rail reading



12V Rail



-12v Rail




Not sure about my new middle Name @scrappysphinx



So am I safe or do I need to do some tweaking

 

[fpmpaolo]

@scrappysphinx came through for me and sent me the Meanwell but its not a RT-65B but a RT-50B I used the Amiga PSU tester and the voltages seem good apart from the -12 seems high

Anyway here are some pics including the voltages

5v rail reading

View attachment 2543959
12V Rail
-12v Rail

So am I safe or do I need to do some tweaking

Those values are read from the connector.
I got them on the floppy inside the MB.

So on the connector you get 5.18V, but in the mainboard you'll get maybe 5.10.
You have plain 12V on the connector: they'll maybe be 11.90V on the floppy pins.

Anyway I think it's a very good setup for a semi-expanded Amiga.

Should you have more doubts, please read this.

 

[darefail]

I approve you middle name
-12v is needed for the serial port and you won't have a problem if it is -13.8v.

 

[Timtheloon]

I believe I have some adjustment here if need but yes good idea to test what I get at the floppy power port

 

[fpmpaolo]

I believe I have some adjustment here if need but yes good idea to test what I get at the floppy power port
View attachment 2543963

You right "mr. Hoarder".
Go test on the FDD and see what you get.
Anyway as told before, it's a good PSU for semi-expanded systems...IMHO

 

[Timtheloon]

I want it for this system but the External CD-ROM does take power from the external floppy drive connector

Timtheloons A600HD PiStorm Build

So I think it will be good