This very question is the major reason that it is not allowed to be discussed. Too many people (of the experience level that come to a forum like this) will think of such a circuit as safe since it just has a low power DC device and they won't realize the very real potential for getting tangled with the mains AC voltage, which can easily be lethal.Can I ask why this is not allowed to be discussed in the forum? is the use of a uC or low power DC device powered by the mains via an AC/DC converter dangerous?...and thanks for the link.