17 Feb
2008
17 Feb
'08
2:52 p.m.
Tony Duell wrote:
Nothing specific (my RiscPC information covers the
motehroard and CPU
board only, not the PSU, which I'll bet was not designed by Acorn).
Exactly right - IIRC they were made for Acorn by Astec...
My
_guess_ (and it is a guess) is that the PSU starts by retifying the mains
to give about 350V DC. If you converted that stage to a voltage doubler,
and left everything after it the same, it might well work. Of course you
need to check if there's anything (fan?, but I doubt it, startup
transformer) that runs directly off the AC mains and modify that too.
I'm not sure about the startup circuit, but the fan is a 12V 80mm (might be
60mm, not 100% sure, but my gut feeling is that it's an 80mm) axial blower.
The bearings packed in on my RPC's fan, so I swapped it for a Papst low-noise
thing. Expensive, but far quieter and rated to last longer than most cheap fans...
Only attempt this sort of thing if you have expeirence
in working with
mains voltages, of course.
And if you have someone else around who knows CPR...
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