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Amiga computer related discussion => Amiga Hardware Issues and discussion => Topic started by: 8bitbubsy on March 22, 2009, 09:17:10 PM
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So, I just measured my original A600 PSU's voltages...
On +5v I got +5.21v = [color=00ff00]GOOD[/color]
On +12v I got +11.92v = [color=00ff00]GOOD[/color]
On -12v I got -14.78v = [color=ff0000]BAD[/color]
-14.78v ??? Is that acceptable or is it like "ARE YOU MAD"? :cry:
BTW: I thought about using this PSU with an A1200 with 1GB CF and Microbotics M1230XA 030 50MHz 32MB RAM... I will *not* test it with the Amiga before someone says -14.78v is okay... :cry:
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Hmmm... Well, I'm not going to categorically say it's fine, but the -12V isn't critical to the workings of your Amiga - in fact, it'll still work fine with it totally disconnected apart from sound and serial. My guess is that it would be fine - I've measured the -12V on PC power supplies and found a number that are a couple of volts out, yet the machine works fine.
Another issue may be that if the -12V isn't regulated (and I suspect it's not), measuring it while it's not connected to the machine may give an increased voltage (well, potential difference) due to the lack of load.
OTOH, an Amiga motherboard is far more precious than an old PC motherboard, so if you don't feel comfortable trying after what I've said, wait for someone else to come on and say it's ok :-)
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as said, you should put some 'dummy' load like car lamp or resistor and check again,
I don't know how much is Amiga supposed to 'draw' from -12V, maybe the "atx conversion page" has that information.
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I have an old A1200 mobo with destroyed CIA chips, I'll try to load the PSU with that one and measure from inside the Amiga. I'll tell back if it changed.
EDIT:
+5.09v
+11.85v
-12.31v! :-D
Thanks buddies :cry: :-)