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 circuit shown in the figure is suggested by Intersil (www.intersil.com) and makes use of the...
This circuit was obtained from American documentation from the 1990s. The transformer can be a car...
National Semiconductor suggests the figure circuit for stabilizing the peak value of an...