A voltage regulator is used to regulate voltage level. When a steady, reliable voltage is needed, then voltage regulator is the preferred device. It generates a fixed output voltage that remains constant for any changes in an input voltage or load conditions. It acts as a buffer for protecting components from damages.
So, what is the use of a voltage regulator?
Voltage regulator, any electrical or electronic device that maintains the voltage of a power source within acceptable limits. The voltage regulator is needed to keep voltages within the prescribed range that can be tolerated by the electrical equipment using that voltage.
Are all voltage regulators the same?
All voltage regulators work about the same. They find a reference voltage between Volts In and Ground and or Volts Out that they use to set the output Voltage. This can make a standard 7805 give any voltage between 5 volts and your supply volts. This shows how much regulators are the same.
How zener diode is used as voltage regulator?
A zener diode is always operated in its reverse biased condition. A voltage regulator circuit can be designed using a zener diode to maintain a constant DC output voltage across the load in spite of variations in the input voltage or changes in the load current.