[Amps] Re Direct rectification of AC mains to derive the amp, VDD, supply

[Manfred Mornhinweg]

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

========================
Visit my hobby homepage!
http://ludens.cl
========================