Yep, they're used in lots of cheap power supplies, not just phone chargers. The poor power quality and safety aren't inherent problems of the ringing choke des

Yep, they're used in lots of cheap power supplies, not just phone chargers. The poor power quality and safety aren't inherent problems of the ringing choke design, those are just issues with cheap chargers. They tend to omit the output filtering and do horrible things to creepage and clearance distances.