Found in American documentation, this circuit can be used as a shield. The technology is CMOS and the input is BDC. Next to the diagram formulas for calculating the components.
Found on Popular Electronics this circuit has variations found throughout this site and section....
Found in an Electronics Now from the 1980s, this circuit uses some components that are still...
High Current Through Hole Inductors for Vishay's 5A Series IHXL-2000VZ-5A Series Power Supply are...