>
> I was never very good at phy / electronics / whatever, but I think you'd need
> an LCR circuit ...
Well better lose the R, it will simply weaken the signal or supply even
under normal operating conditions. A capacitor has all the disadvantages
of a shunt regulator, besides if it fails you're still screwed. If a
coil fails, since it is in series with the line, your hardware will be
essentially disconnected and hence safe. But go on ahead, open your
hardware (no pun intended) and solder a capacitor with a C value small
enough to pass your highest operating frequency (few 100 Khz for dial up
telephone) but with a voltage rating of 2 million volts. Do mail and
tell me the cost of such a capacitor if available and the look on the
face of the electrical store sales-person when you ask him for such a
capacitor.....
or you could just tie a few knots in the wire. better still unplug your
hardware (no pun again) during a storm.
>
> What do the knots do, then? As the wire becomes noticeably thicker at the
> knots, it's a kind of primitive fuse, perhaps?
>
A changing current through a wire sets up an electric field that opposes
the current that set it up. The knots and coils simply help to
concentrate the magnetic field to be more efective. A surge is a very
rapidly changing current (almost infinite frequency). Thus the knots
won't affect your normal operation much but will oppose the surge.
:o)
mario
p.s. remove the "l" from solder and re-read the line in which it occurs
in the mail. must be my work pressure getting to me, but i found it
funny.
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