One end of the clip is connected through the transistor whereas another end is connected through LED Strips. The design of the voltage regulator circuit is a variable resistor, the alligator clip & three LED strips need to connect toward the transistor one by one. So, voltage regulator plays e key role in almost all electronic applications. It works as a buffer to protect the components from damage. So this voltage remains stable for any modifications within input voltage otherwise conditions of load. Once a stable or reliable voltage is necessary then a voltage regulator is used to produce a fixed o/p voltage. A voltage regulator in this circuit is used to change the levels of voltage. This circuit is very simple to build with the necessary components. Generally, a transistor working is that a voltage or current is given to one pair of terminals in the transistor then it controls the flow of current throughout the remaining pair of terminals because the output is higher as compared to input power. Voltage Regulator Circuit with 2N3055 Transistor This circuit can be built with different basic electronic components like 2N3055 transistor, variable resistor-5k, 3 – LED strips which contains 4 LEDs in each strip, and a 12V battery. The simple voltage regulator circuit using a 2N3055 transistor is shown below. How to use 2N3055 Transistor/Circuit Diagram?