27. Transistor Application

Question.5

Karthik is reviewing a circuit where a transistor is placed between a microcontroller output and another IC input.
The load connected after the transistor draws very little current, but the transistor is still present.

What is the main purpose of the transistor in this circuit?

To increase the voltage level of the signal
To isolate and protect the microcontroller pin while driving the next stage
To regulate the supply voltage
To amplify the signal into a high-power output

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