On 28/09/2020 12:11, Fredxx wrote:

A resistor, diode and zener can get you a low power 5V.

Not low power - you are dropping around 230V through that resistor. Even
at only 5mA that is 1.65W to be dissipated, and that is considerably
more than a standard resistor will handle . Interestingly, Paul's post
notes "There is a large resistor that does the dropping to bring the
240V down to some lower level."

--

Jeff