7 Mar
2005
7 Mar
'05
2:16 p.m.
But you
probably could do fine, I'd guess, by just cutting the mains
ground connection for one or the other supply, as appropriate.
No, don;'t do
that. FOr one thing most PSUs have a mains filter
including 3 delta-connected capacitors. If you take off the ground
wire, the chassis wil try and float at half mains voltage (!). And for
another thing, if you have a component failure, you could end
up with mains on the case or output side, and the fuse won't fail.
Well, it depends on what happens when the other supply sees mains
voltage between its output 12V line and its ground line. But yes, this
may be a concern; you may want to find something like a nice hefty 15V
zener - one that can sink substantial current - and install it on the