6 Mar
2005
6 Mar
'05
2:44 a.m.
der Mouse wrote:
NNNGGHH!!! Danger! Crazy behaviour!
If you're really stuck for a 24V supply, you could try two smallish
deep-cycle batteries, like UPS or motorcycle batteries.
Gordon.
...can't you take two bog-standard peecee power
supplies and connect
ground of one to +12 of the other and get a 24V rail that way? I
*thought* the output side was supposed to be isolated.
Isolated from the power line != isolated from ground I would not be at all suprised to find that the 0V
line on the output
side is in fact connected to mains ground. If that's the case, you
fairly obviously can't link 2 PSUs in series
I just picked up a handy not-currently-in-use PSU and opened it up.
The mains ground is connected to the chassis; the PC board mounting is
via metal standoffs, and they rest on solder pads which are connected
to the output ground wires. So you are correct - at least for that
supply, and I have no reason to think it exceptional.
But you probably could do fine, I'd guess, by just cutting the mains
ground connection for one or the other supply, as appropriate.