This 1.2 to 32 V x 3 A regulator was found in an 80's EDN. The power components must be equipped with good heat sinks.
This configuration that appears several times with variations on this site is from old American...
This configuration (somewhat critical, as the imbalance of characteristics between transformers can cause...
This circuit is from a Popular Electronics of the 90's. Any power MOSFET can be used. The circuit...