Delete comment from: Ken Shirriff's blog
Hi Ken
Great work!
But my experience of switch-mode wall-warts is that too many of them die, almost invariably because of inadequate ripple-rating of either the mains-side electrolytic capacitor or else the first electrolytic after the secondary-side rectifier. (The equivalent components in the Standby-supply section of a desktop-PC PSU account for nearly all dead ones of those too.)
BTW For live-side measurements I use a Tektronix P5200 HV Differential probe - this has been an expensive but most-useful accessory and is good at rejecting stray-fields around switching supplies!
Jan 20, 2013, 2:57:10 PM
Posted to A dozen USB chargers in the lab: Apple is very good, but not quite the best