30 Jun
2008
30 Jun
'08
7:59 p.m.
On Mon, Jun 30, 2008 at 02:24:16AM +0100, Tony Duell wrote:
Just to confirm : There are mains swithces, yes? There is no
mains-frequency trandormer in them, rather the mains is recrtified,
smoothed, and then chopped/
How did they get the 9V AC output, and what freqeuncy is it? If it was at
the typial switching frequency of a small SMPUS, I would think the RFI
(from harmonics) would be horrible. And I wouldn't trust the ridge
recifier in the C64 at that frequency.
But to produce it using, say, a full H-bridge cirucit from a DC supply
seems over-complicated too.
-tony
Making a switching supply to give a 50Hz or 60Hz AC output would be
decidedly non-trivial (and IMHO not senisble here). The obvious way to
And yet I've got a couple of C64 power supplies that are most definitely
switchers. *Someone* did it, but since they're currently 220 miles away
it's a bit hard to read the label.