This circuit was found in Mullard's transistor application manual from 1960. More modern transistors can be used. The zener diodes used have the indicated voltages.
The configuration shown in the figure uses two NPN transistors activating the load when the input...
This circuit was found in American documentation from the 1980s. Its purpose is to use a 170 MHz...
This circuit protects galvanometers that are excited by low impedance amplifiers. The circuit is...