Transistors

Transistors are a pivotal component in any modern circuit. They are semiconductors (much like diodes) that can be utilized to create amplification circuits and electronic switches, making them a cornerstone of most electronic devices. One of the most basic types of transistors is the bipolar junction transistor, which has two sub-types: NPN and PNP. Watch the videos below to learn more about them, and how to troubleshoot them when necessary.

Self-Assessment Questions:

Click here to test your understanding on Transistors – Part 1 (how transistors work and types of transistors)

Click here to test your understanding on Transistors – Part 2 (usage and application of transistors).

Discussion Questions:

1. Referring to Sekitani et al. as a starting point, use the internet to find two examples where transistors can be used in a biological setting. Why are transistors needed for these applications?
2. Consider the atomic structure and physical/chemical properties of semiconductors. How do semiconductors enable transistors to achieve the desired functionality (see Crone et al.)?
3. As described in the video, a transistor in the linear region can be used to amplify AC current. Provide two examples of biomedical devices where this ability could be useful.
4. Transistors are often used as switches. What is a biomedical device that needs a switch? Explain how the transistor helps the device achieve its desired function (see Crone et al. for a starting point on how a transistor works).

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About the Creator:

This video was created by a student in the Rice Bioengineering Class of 2021 (used with permission).