Powering up a 20-year old MicroVAX II

[Tony Duell]

> 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.

For the mains smoothing capacitors (large electrolytics after the 
rectifier stage), sure. But for the mains filter capacitors 
(non-polarised, connected acrsso the mains or between one side of the 
mains and ground, before the bridge rectifer), I doubt it.

-tony