Found in an Electronic Engineering from the 80's, this circuit makes use of components of the time. The circuit can be implemented with modern equivalent components.
This circuit can be used in the car to convert the 12 V from the battery in 6 or 9 V up to 2 A....
March 2017 - Coilcraft SLR series inductors for currents up to 100 A can be obtained from Mouser...
This sensitive electroscope uses a MOSFET 3N128 and can detect electrostatic charges of objects....