Well, I'm making my A500/Atx Psu, and I've found an Atx one with the perfect measures and specs:
http://www.ebay.es/itm/130559661001?...84.m1439.l2649 , SEASONIC-ATX-PSU-MODEL-SS-250SFD
250 watts; 125mm x63mm (75with fan) x100mm, and
+3.3V@18A,+5V@21A,+12V@16A,-12V@0.8A,+5VSB@2.0A
So I'm going to resume how to mount it in a post
The holes for the Psu's boards are
in the same place, so you don't have to cut anything in the A500 one (
incredible). You'll see that the voltages are written in the board, even the cable for "Ps-on" that
goes to ground for the Psu to run, so really, really easy. You can use this guide too:
http://www.ianstedman.co.uk/Amiga/am...iga_power_lead Basically this image:
And
usually (you have to test this with a multimeter):
Amiga Colour
ATX Colour
Voltage
RED
RED
+5V
BLACK
BLACK
0V/GND
BROWN
YELLOW
+12V
WHITE
BLUE
-12V
You can desolder the cables that you don't need from the board, but you need a powerful solder or desolder for that. I just cut them. Ground and shield go together to ground of the psu.
Before connecting it to the miggy I recommend to use the multimeter and test the voltages with the image above.
Well, finally you'll have to buy a thinner fan, as there's no room for the original. I've just bought this from China
http://www.ebay.es/itm/251062116465?...84.m1439.l2649 , so I'll have to wait a month.
I'll be putting a voltmeter like I did in another (Gibs made it first).
The problem I've found is that my powerful miggy consumes a lot of power, so it wasn't booting shortening the cable even (well, it was booting, but only from the Idefix, not from the Scsi -yep, it has both to boot from-. I've got two more A1200's and they were booting without problems), and I didn't want to cut the cable as short as Amigakit's Psu. So finally I've used an Amiga power connector that I had from time ago (now you can buy it
here) and I've connected it to a cable thicker than the original. It's black, but... it works
. Listen... you don't have to use it if you aren't using as I am a BPPC, BVision, Delfina, DVD, 5 fans, Idefix, Subway..., Clockport expander, Acard and 2 Cf's adapters. The resistance of a given piece of wire depends of three factors: the length of the wire, the cross-sectional area of the wire, and the resistivity of the material composing the wire. The Amiga power connector isn't the best, and a long cable (2 meters the original) draws some power being so thin, so a thicker and shorter one has less resistance.
So this is how it is now (yes, it's so easy as you see here):
I forgot: You have to connect some (3) resistors to the 3.3volts line
for this psu (250watts) to stabilize (thanks rkauer). I bought them here:
http://www.ebay.es/itm/5W-Watt-5-Ohm...item5ae5fe42db 5W Watt 5 Ohm 5% Ceramic Cement Power Resistors
I asume all the responsibility. Ah, no.. lol... use this guide At your own risk
, and careful with caps and old Psu's.