How do they make cellphone adapters, especially "travel adapters", so small?
I once peeked inside an old Nintendo adapter, and it had (among other circuitry) a rather-bulky step-down transformer to bring the voltage down from 220V mains to 12V, and a diode-based rectifier to convert AC to DC. This is my limited knowledge of how power adapters work.
I'm really curious how they manage to fit a transformer inside such the tiny travel adapter - so I tried to google it, and found this disassembly of an Apple adapter. I'm not sure if the thing with the yellow tape around it (towards the end of the vid) was a transformer - is it possible to make transformers so tiny these days?
Or is there some other way to reduce the voltage (apart from using a transformer) that is used in travel adapters?