I rarely contribute to this forum but I love the winding road that comes out
of the various topics discussed.  Although an engineer by schooling I have
not been doing much engineering in my career.  As my skills get rusty it is
fun to read the stuff on this site.  As for the injected DC with a diode on
a light bulb, I just remember reading about it in an electronics magazine
one time.

It is interested to not how many products now days are using the reactance
of a capacitor to drop AC down and then rectify it.  Most motion sensor
lights use this circuit.  In school we were always taught that you always
had to use a transformer for isolation and safety.  I guess with the
pressure on price now this is not always to rule of thumb.  BTW, are there
any ramifications with a diode on the AC mains.  When you look at all the
other sources of dirt on the AC mains, is this really of importance?


An 'off-line' switcher (like in a computer), which is driven directly off
the AC line will still have a higher frequency transformer in it, and will
almost always contain a full wave rectifier on the incoming A/C power. This
removes any DC component from the load the switcher presents to the house
mains.

Bo
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