Below are circuit diagrams of various series and shunt voltage regulators.
Shunt Regulator with One Transistor and One Diode
High Output Shunt Voltage Regulator
Op-Amp Shunt Voltage Regulator
Series Regulator with Transistor and Diode
Series Regulator with Transistor and Diode
Op-Amp Series Voltage Regulator
Series Voltage Regulator with Current Limiting
Series Voltage Regulator with Foldback Current Limiting
