This circuit was obtained in a 1980s publication, but it can be easily assembled today, as all components are common. The transformer is 12 + 12 V with at least 1 A and the diodes 1N4002.
Found in an Electronics Now from the 90s, this application uses an integrated circuit from the...
This circuit can be applied to other 3-terminal regulators and equivalent transistors can be used....
This circuit was found in an old Electronic Design used to apply digital signals to an analog...