Fascinating article, and much like his teardown of a real MacBook charger, filled with interesting information. It also comes with a warning: don't use counterfeit chargers. You may save a few euros, but it could easily cost you much more than that if things go bad.
What's inside a counterfeit Macbook charger? After my Macbook charger teardown, a reader sent me a charger he suspected was counterfeit. From the outside, this charger is almost a perfect match for an Apple charger, but disassembling the charger shows that it is very different on the inside. It has a much simpler design that lacks quality features of the genuine charger, and has major safety defects (Righto.com).