Peter,
I am afraid you are missing my point.
So it seems!
What you can do safely as a
professional engineer is not the same as the average amateur building
at home.
Indeed I was referring to what can be done, IF correctly done. Either by
a professional, or by a COMPETENT homebrewer. It's clear that when
people who don't have a basic understanding of electrical safety build
mains-connected equipment, the risk level is high. No newcomer to
electronics should build an off-line powered kilowatt amplifier as his
first electronic project!!! Instead he should start playing with simple,
safe, battery powered circuits, like 555 led flashers, and work up the
ladder from there.
Many years ago now, there was an article in QST entitled "Just like
the QST article except...": it went into how people made minor
changes to the published design and had problems.
I could see the same article being required again......
Perhaps not. QST has dumbed down a lot lately. Technical articles fill
only a few pages in each issue, and the level of them tends to be very
basic. It's a far cry from the good old times when QST was filled almost
from start to end with construction articles for radio equipment.
While to see one result of an inadvertent earthing
http://www.railwaysarchive.co.uk/documents/MoT_Barnham1962.pdf
A ground fault interrupter would have avoided that derailing. But they
were not around in that time.
Manfred
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Visit my hobby homepage!
http://ludens.cl
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