"Arny Krueger" wrote ...
"Richard Crowley" wrote
"Arny Krueger" wrote ...

You're aware that capacitive voltage dividers have flat
frequency response, right?

Perhaps you are not aware that many inexpensive consumer
mains power supplies use a capacitor rather than a
resistor as the series element of a shunt-regulated power supply.

Right, but that's not a true capacitive voltage divider.

You are correct. I mis-characterized it as a "capacitive divider"
when only the series element was capacitive.

The circuit is essentially a high-pass circuit and very
much has a rising response.

Those half-breed RC voltage dividers do need to be engineered carefully.

Rumor is that the manufacturer re-designed the circuit to
eliminate the problem.