State three components that can be used to make a regulator in power supply?

1. Voltage reference: A stable voltage reference is essential for regulating the output voltage of a power supply. This component ensures that the output voltage remains constant regardless of fluctuations in input voltage or load.

2. Error amplifier: An error amplifier compares the output voltage of the power supply to a reference voltage and generates an error signal that is used to adjust the output voltage. This component is crucial for maintaining the desired output voltage and ensuring stability.

3. Pass element: The pass element, typically a transistor or a MOSFET, is responsible for controlling the flow of current through the power supply and adjusting the output voltage. By varying the resistance of the pass element, the output voltage can be regulated to the desired level.

1. Variable resistor
2. Transistor
3. Zener diode