Recommended
Deadly camping light with 240v USB outlet.
Why people recommend it
Big Clive tears down a camping light whose capacitive dropper can leave its USB port at mains potential; cited as a vivid example of unsafe cheap design.
Watch for: the circuit explanation around 11:20
In their words
In a video with BigClive, he takes apart a camping light and says it's deadly when you have mains plugged in and usb plugged in at the same time.
Johnston on electronics.stackexchange.com, Apr 2019. CC BY-SA.
