Introduction
Let's look inside this hockey puck shaped wall adapter. This is an older USB AC wall adapter, not Level VI efficient, and discontinued.
What you need
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This power supply is slim and unusually attractive.
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That white case is 39mm in diameter, and 15mm thick: pretty small for this power level (see heat sinks later).
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The case is glued together, so you're not going to get into this one cleanly. I sawed a slot in the side, and used a screwdriver to crack the glue.
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The wall power pins lead to two spring contacts.
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There's a plastic barrier between the low voltage and high voltage sides (you can't get much better than that!).
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Pretty tight layout.
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Note the heat sink with thermal interface material, and the landing pads for the line voltage springs.
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