2 Jul
2008
2 Jul
'08
2:24 p.m.
Tony Duell wrote:
JOOI, what changed between iterations of the A500 PSU? I had one A500 with a
beige PSU that felt like it must have dark matter inside - my other one had a
white/cream PSU which felt more like it was little more than an empty shell...
Were the beige ones non-switchmode designs, with a heavy transformer, caps and
big regulators or something? Or did they just have some serious heatsinks /
screening?
I never did take a look inside, but always meant to...
OK, I stand
corrected. I finally got home tonight, and was smug enough
to go out and pull the units.
First, the lightweight PSU I have with a C128 is not a C128 PSU at all,
but a A500 PSU. I am sure we tested the PSU with a C128 last week (we
were going through the units prior to the C4 CBM EXPO this past
weekend), but I'll have to check. The reason's it is so light is it
only provides DC on the outputs. 5 and +-12. It simply chops mains to
get what it needs, I would guess.
The A500 PSU is, indeed, a conventional switcher.