PDA

View Full Version : Difference between PC 5150 and PC AT power supplies?



fjk61011
March 31st, 2017, 06:18 AM
Difference between PC 5150 and PC AT power supplies?

Are they interchangeable except for the cooling slot.

Would a more modern AT power supply work in a 5150?

lutiana
March 31st, 2017, 06:51 AM
IIRC they are shaped differently.

lyonadmiral
March 31st, 2017, 07:09 AM
Different size, different I/O button location. Would be better off putting a PC/XT supply in, unless that is what you originally meant instead of PC/AT.

fjk61011
March 31st, 2017, 07:19 AM
ebay has some PC ones. Only 63 W. I have an St-225 in PC. they are very dear, plus shipping.

Chuck(G)
March 31st, 2017, 07:50 AM
You can purchase modern PSUs and repackage them in the 5150 box if you're handy. A small DC-DC converter can provide the -5V if you need it.

fjk61011
March 31st, 2017, 07:55 AM
You can purchase modern PSUs and repackage them in the 5150 box if you're handy. A small DC-DC converter can provide the -5V if you need it.

Very clever Mr Chuck. I presume I would have to resolder the Power sockets. How would I go about the DC-DC converter?

EDIT: the board is an 64 Mb to 256Mb. Do I not need a minus 12V as well?

lutiana
March 31st, 2017, 08:05 AM
Just grab an ATX to AT conveyor on Ebay - http://www.ebay.com/itm/ATX-20-PIN-to-AT-P8-P9-CONVERTER-WITH-5V-ON-OFF-SWITCH-DUMMY-LOAD-USA-MADE-/251025150787?hash=item3a7243d343:m:mWB2OPbZuFSqkmH j4SuUliA (has the -5V circuit built in).

And yes, you would have to do something with the power sockets (re-solder them) and you may have to come up with a creative way to mount the internals since the mounting holes probably won't line up.

Chuck(G)
March 31st, 2017, 08:10 AM
Very clever Mr Chuck. I presume I would have to resolder the Power sockets. How would I go about the DC-DC converter?

EDIT: the board is an 64 Mb to 256Mb. Do I not need a minus 12V as well?

As far as I know, most modern ATX PSUs still supply -12V. The -5V, if needed, can be derived from the -12 with a simple 79L05 3-terminal voltage regulator. But yes, some soldering is necessary.

New PSUs are not likely to have age-related issues.

fjk61011
March 31st, 2017, 08:31 AM
Pretty cool. $18 postage to Ireland. I'll search for a better offer.

Malc
March 31st, 2017, 09:16 AM
XT 5160 PSU's turn up on ebah UK now and again, But if you are going the transplant route check ' Evercase (http://www.ebay.co.uk/itm/AT-PSU-Power-Supply-Unit-for-old-Type-of-PCs-5volt-P8-P9-connectors-NEW-/191852284907) ' on Ebah.

fjk61011
March 31st, 2017, 10:03 AM
Well that's knackered it. I connected the 130W PSU into a 486sx case. Switched on. There was a POST beep, after a few minutes the fan stopped spinning. Before I could switch off the PSU went puff as did my underpants. Definitely need a new PSU now. Only benefit is that it could have happened when I was not there and caused a fire.

Checking Evercase.

lutiana
March 31st, 2017, 10:12 AM
Yeah, I ran into the same thing with one of my IBMs, just gutted a newer ATX PSU, soldered AT leads on it, grounded the green wire. Then emptied out the XT power supply mounted the "new" psu boards in there, connected up the high voltage in and it worked out perfectly. I was lucky that the ATX PSU I chose actually had the -5V already (ATX 1.0).

fjk61011
March 31st, 2017, 10:32 AM
Reconnected the 486, motherboard not fried. Whoop.

fjk61011
April 1st, 2017, 07:00 AM
What I actually did was connect 220V to the 110V PSU. :rolleyes:

Malc
April 1st, 2017, 09:56 AM
Ouch! They do go pop when you do that :-)

fjk61011
April 1st, 2017, 11:15 AM
Ouch! They do go pop when you do that :-)

That's one way of putting it. Surprised the motherboard still works.