31 Jan
2009
31 Jan
'09
8:38 a.m.
On Fri, 30 Jan 2009 Chuck Guzis said:
Read about it:
http://www.smpstech.com/filter00.htm
Interestingly, the real-world example cited is the addition of an
input filter to a PDP 11/40...
The part of this that really amazes me is where it says something like "long
power supply input lines" can also cause problems or oscillation. I suppose
this includes for example all the wiring in my house or at the office, over
which I have no control and very little detailed knowledge. I wonder if the
effective length of the AC input line is all the way back to the transformer
on the pole or wherever? If my guesses are correct then it is sort of scary
to plug in any SMPS anywhere! I would hope that most SMPS these days have
an input circuit that is reasonably immune to most of these problems, but I
certainly don't know that.
BTW, I have been reading the digest form of this group for a couple of years
now but I think this is the first time I have posted a reply of any sort.
If I goofed it up, profuse apologies in advance!
Later,
Charlie C.