Bipolar Junction Transistors

NPN and PNP Transistors
In this lab, students will be looking at some of the important applications of transistors in the real world, discussing why they are important, why we use them, and what they can do. A transistor, similar to a faucet, can control the flow of electrical current. In section 1 of this lab, students will look at the definition and the importance of a transistor and understand its behavior by simulation using Multisim Live. In section 2, students will learn how bipolar junction transistors are used as a switch. They will use actual breadboarding and circuit-building to confirm the theory and simulation.


This is lab 4 of 14 in the course, Analog Electronics.


After completing this lab, students will be able to:
  1. Discuss the characteristics, operation, and application of a Bipolar Junction Transistor (BJT).
  2. Identify the regions of operation of a BJT.
  3. Manipulate the input to a BJT to operate the BJT as a switch.


  • Basic proficiency using Multisim Live
  • Basic proficiency using ELVIS III Instruments
  • Basic knowledge of breadboarding
  • Basic knowledge of components and their behaviors

Required Software

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Required Hardware

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