1 Mar
2009
1 Mar
'09
9:25 p.m.
"Roy J. Tellason" wrote:
On Sunday 01 March 2009 10:36:33 pm Brent Hilpert wrote:
OK, (you've seen the photos), I thought the ealier poster might be alluding
back to the electroytics discussion, so just threw in the comment.
"Roy J. Tellason" wrote:
That's not necessarily a flaw: 120/240 supplies often do the voltage
selection by switching the circuit between bridge rectifier for 240V and
voltage doubler for 120V. In the bridge config two caps end up in series,
so 250V+250V=500V.
Not if the config is the two caps being across the line, before and after the
typical inductor that's also commonly a part of that filter...
The series connection is usually the two _main_ filter caps, not the line
("mains") filter components. If it was
plugged in but not switched on and something popped, it'll be
the mains filter cap. They *do* fail, and they're easy to replace.
In seeing photos of this in the process of dealing with it offlist, it
looks exactly like that's what it was. When I asked about the markings
on the failed parts I was told that they included "250V", which is way
inadequate for UK mains voltages...