Voltage Regulator Basic Definition 
A voltage regulator is an electrical regulator designed to automatically maintain a constant voltage level. A voltage regulator may be a simple "feed-forward" design or may include negative feedback control loops. It may use an electro-mechanical mechanism, or electronic components. Depending on the design, it may be used to regulate one or more AC or DC voltages..continue..

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. Such a device is widely used in motor vehicles of all types to match the output voltage of the generator to the electrical load and to the charging requirements of the battery. Voltage regulators also are used in electronic equipment in which excessive variations in voltage would be detrimental...continue..

The automatic voltage regulator or AVR, as the name implies, is a device intended to regulate voltage automatically: that is to take a varying voltage level and turn it into a constant voltage level.
There is tremendous diversity in the size and type of devices that could qualify to be called an automatic voltage regulator. To get a sense of the degree of diversity among AVRs, consider an analogy about the term “spotlight” which can mean pixel-sized all solid state elements found in display devices to truck-mounted, power guzzlers to illuminate the night sky..continue..

The objective of this thesis is to design and develop a digital control system to maintain or control the terminal voltage for the laboratory's three phase synchronous machine..continue..

The 7805 IC or 5V regulator has a maximum current of 1.5A.  By adding transistor and resistor, you can increase its current capacity. The circuit below can deliver a current up to 5A at a regulated 5V supply, with just minimal modification...continue..

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