This circuit is from a 1969 EEE magazine. The transistors are from that time, but the circuit can be implemented with modern equivalents, such as 2N2646 for Q3.
This circuit was found in documentation from the 90's, having an LC compensation network. The...
This circuit was suggested by old French documentation, but it can be used as a shield, in which...
This circuit was found in an old documentation. It converts DC voltages and its maximum current...