Quote:
Originally Posted by Clev
Most electronics nowadays use switching power supplies instead of transformers. They're far more efficient, and can handle a wide range of AC (and sometimes DC) voltages.
Combining power supplies makes sense in a single area where multiple devices reside (as in NiHaoMike's example), but higher voltage moves with less loss over the same wires, so it's more lossy to run, say, 12V all over the house than it is to have individual power supplies tapping off 120V or 240V.
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AV recievers are now starting to use SMPS, they are one of the last "holdouts". Furnace transformers are still the old school style, I don't know if they will ever go SMPS.