5 volts with collector terminal through 220ohm resistor. In this example circuit, we attach a push-button with a base terminal. After that, we will see an example of controlling a dc motor with Arduino Uno. First, we will see an example of a simple LED controlling example with a switch. In this section, we will discuss some examples using this NPN transistor. Current, voltage and power can be easily amplified by using these configuration modes. Similarly in the amplification application, it can be connected in three configurations such as common emitter, common collector and common base. A current limiting resistor is also in the circuit for limiting the base current because it could be damaged the transistor if the source current is greater than 5mA.
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