If we want to connect a load that requires a higher operating current demand more than 3mA, it will burn microcontroller. But the question that may come to your mind, Why do we need to interface transistor with a microcontroller? Because microcontroller pins can not provide output current more than 3mA and voltage more than 5V. In any application, we need to interface a transistor with a microcontroller. how to use it as a switch in microcontroller projects.
How to use a transistor as a switch in electronics circuits.You can check these practical transistors: 2N2222, MPSA42, 2N3906 Using transistor as a switch
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