Mean Well RT-50B in Amiga 500 (US) Power supply

[FerociousAmiga]

Hello all,

I found several guides for installing the MW in the A500 OEM power supply but these guides seem to be UK power supply. I did tone out my plug wires and realized the UK model wire colors are assigned to different pins. The US model power supply has 6 wires, two for +5v (brown/yellow). UK power supply has 5 wires to the Amiga.

Q: should I combine the two +5v into one or not use the one of them? The yellow seems to be thinner. (see pics).

Thanks in advance!

http://www.eab.abime.net/showthread....light=meanwell

http://www.retro32.com/amiga-resourc...-rt-50b-rt-65b

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[Jope]

Yellow is probably a sense wire used by the original power supply to adjust +5 / compensate for cable losses.

Combining wont hurt anything, if you don't combine them, only use the brown wire.

[alenppc]

I discovered that the RT-50B performs very poorly when powered at 110V. The voltages are very unstable and often too low to power the Amiga. All of these issues disappear if you power it at 220V however.

The RT-65B on the other hand did not have these problems for me, and unlike the 50B, it produces a nice and steady voltage at 110V.

I bought both units from Mouser.

[amiman99]

I can confirm that I have RT-65B and it works fine on A1200 with Blizzard IV 50MHz with internal CDROM.

[FerociousAmiga]

Thanks for the feedback. I do seem to be getting the correct Voltage (see pics) so I am a bit confused about the "RT-50B performs very poorly when powered at 110V", please explain, not holding constant same voltage? I did replace the OEM power switch (made in England) with a new (made In China), both 250v 6amp specs.

I will be using on the A500 Rev5:
SuperGen SX or DCTV (not at the same time)
Serial to USB mouse adapter
DSS8
A501 memory expansion.
Classic 520 '020

The issue I had was with the Serial to USB mouse adapter randomly working.

[alenppc]

The problem with my RT50B was not on the PSU terminals, the problem was under load. Even with the pot cranked up to the max, you'd only get about 4.6V on the Amiga motherboard with lots of oscillation up and down. This would make the system unstable.


However once I plugged the meanwell into a 220V converter the instability was gone.



That's why I recommended getting the 65B instead which did not suffer from these problems.

[FerociousAmiga]

Thanks alenppc, I ordered the RT-65 instead. Mean while I connected the RT-50B and tripled checked the pins, wires and voltage. Didn't kill my Amiga!

[FerociousAmiga]

Had some issues with my Amazon order and have to reorder the RT-65 (another week waiting ), mean while I've been testing this RT-50B since the weekend and seems to have resolved my issue with the Serial-to-USB mouse adapter randomly powering the USB mouse.

Originally Posted by FerociousAmiga

Thanks alenppc, I ordered the RT-65 instead. Mean while I connected the RT-50B and tripled checked the pins, wires and voltage. Didn't kill my Amiga!