Also, use a 220Ω resistor between the switch and base terminal.10kΩ resistor will limit the current below the forward current requires to turn on an LED.If you use 10kΩ LED will not glow when you turn on the switch due to low current passing through the LED.By mistake, 10kΩ used as a current limiting resistor with an LED. Connect an LED with an emitter terminal through a 220-ohm resistor.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.
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