This circuit is from an American 1967 documentation and can be implemented with modern equivalent transistors. The circuit serves as a Q multiplier.
This circuit uses a metal enclosed transistor as a temperature sensor. The circuit is from an old...
This circuit was obtained from Dutch documentation from 1964. The components are of the time, but...
Equivalent transistors like the BC548 can be used on this 1969 Mullard circuit. The circuit has two...