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Voltage Regulator


A voltage regulator is a voltage stabilizer which is meant to mechanically stabilize a voltage level. A voltage regulator circuit is also used to modify or stabilize the voltage level according to the requirement of the circuit. Thus, a voltage regulator is employed for two purposes:
- To regulate or modify the output voltage of the circuit
- To keep the output voltage constant at the required value inspite if variations in the supply voltage or load current.

Voltage Regulators have a stable voltage reference supply which is provided by the reverse breakdown voltage operational diode known as zener diode. The key purpose f using a voltage regulator is to keep up a constant DC output voltage. A good voltage regulator might also include additional circuits for defence like short circuits, current limiting circuit, thermal concludion, and over voltage protection.

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