These transformer power supplies were usually not stabilized (although stabilized ones also existed), and the voltage was selected by switching the pins of the transformer’s secondary winding ...

The PC power supply has been a standard of the junk box for the last couple of decades, and will probably continue to be for the foreseeable future. A product that is often built to a very high sta… ...

The flyback design is a switched-mode power supply (SMPS) that’s been used for 70+ years and still going strong. This supply—also called a power converter—has two distinct operating phases ...

I think that a PS with backup power is a great idea. However, 200W isn't enough for most applications these days. Perhaps some official body will come wup with a new spec for this kind of supply ...

Some power losses that occur in series primary components, such as the bridge rectifier, common-mode choke, and switch, are not directly associated with energy stored in the flyback-transformer core.