On 12/4/2010 5:04 AM Mark Zacharias spake thus:

"Wild_Bill" wrote in message
...

Having a DC output from a transformer is obviously more common that
you think.

The old style automotive ignition coil (autotransformer) outputs HV
DC.

That's one example, and it is a transformer although not the kind
used for a game system power source, and the output isn't
rectified.

"David Nebenzahl" wrote in message
.com...

How do you get DC out of a transformer? Must be a really special
one ...

Of course, it's impossible to tell from the O.P. whether the
thing in question is really a transformer (outputs AC) or a power
supply (outputs DC).

To the OP, it would help us to know. What does it say on the wall
wart? Should say something like "10 VAC" or "10 VDC" or some
such.

Lot's of "wall-warts" have a rectifier diode and capacitor in the same
little box. More and more they actually have little switching regulators in
there. Those are more efficient and can supply much more current, but they
usually don't last much more than about 15 months because they use such
crappy little capacitors in them, and they are virtually unserviceable.

Yes, we know that. My point is that a lot of wall warts are just what
the O.P. called them--transformers--and that we really have no idea what
his is, based on what he posted.

More informations, please.


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