1 Mar
2009
1 Mar
'09
7:36 p.m.
"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.
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...