Hi, everyone,
I have seen several circuits from a book to step down 220V AC to 12V DC using only resistor, capacitors, diodes, and a 12V Zener diode.
220V---Parallel RC---R---Bridge---Zener and smoothing caps---GndLoad is connected to the 12V from the Zener and Gnd is from the bridge negative pin
I am curious about why the portion "Parallel RC---R" can be used.
For RC parallel components, R=750k C=0.1u (400V)
For another resistor, R=22