Found in 1965 Delco Radio documentation, this circuit uses transistors from that era. Modern equivalents can be used. The characteristics of the inductor were not given.
We found this circuit in an English publication from 1982. The power MOSFET can be of any type and the...
This circuit is an impedance adapter. The circuit is from a Radio Electronics from April 1966. The...
This circuit was found in a 1997 magazine. It uses a CMOS 4060 circuit powered by 12 V which is...