Delete comment from: Ken Shirriff's blog

Ken Shirriff said...

Anonymous: you ask why the blue component is a capacitor and not a varistor. It does look a lot like a varistor, and I thought it was one at first. But the X1 Y1 markings are a giveaway that it's a Y capacitor. Also, since it connects the primary and secondary it has to be a capacitor - if it were a varistor it would connect the wall AC directly to the USB ground which would be very dangerous.

Oct 1, 2013, 2:23:27 AM

Posted to Apple iPhone charger teardown: quality in a tiny expensive package