Voltage regulators are commercially available as integrated circuits.
They stabilize voltages and compensate fluctuations...
Thereby voltage regulator can be
distinguished by their field of application...
Fixed Output Voltage Regulators
for different voltages (eg 7805, 7809),
adjustable voltage regulator (eg LM317),
voltage regulators with low power dissipation (eg LM2940),
High power voltage regulators for high currents, etc....
In the experiments, you use the following voltage regulator...