Why You Own 40 Unlabeled Power Supplies
A box of forty unlabeled power supplies, exactly one of which fits — and the reason it exists is that an entire industry spent fifty years failing to agree on a tube. This episode digs into coaxial barrel jacks: why the size is written as outer diameter times inner diameter, why nothing on the connector tells you the voltage, and how three competing standards from three industrial powers left us with the drawer of doom. Then it turns to IEC 60320, where a single rule — the inlet sheet is always one higher than the cord sheet — untangles C13 from C14 forever. Plus the one-directional trap that…
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