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 circuit was obtained in a publication for radio amateurs of the 70s. The PNP output...
This shield circuit was found in an American publication from the 80's. The triac is of low...
I found this circuit in a documentation for radio amateurs from 1975. The FET could be the BF245....