Join Barron Stone for an in-depth discussion in this video NPN bipolar junction transistors, part of Electronics Foundations: Semiconductor Devices.
- [Instructor] A bipolar junction transistor…or BJT…consists of three alternating layers…of doped N-Type and P-Type semiconductor material…joined together.…And there are two ways that those three layers of material…can be stacked.…The BJT in the left…is called an NPN Transistor…because it contains a section of P-type material,…sandwiched between two N-Type sections.…And its counterpart on the right…is a PNP Transistor.…Because it has two P-Type sections…with a region of N-Type material in the middle.…
For now,…I'll just focus on how an NPN Transistor works.…From a physical standpoint,…the three alternating layers of material…create two PN junctions.…At first glance,…those back to back PN Junctions…might look somewhat like a pair of diodes.…With their cathodes connected together…pointing away from each other.…This is a common simple vocation…that many people like to use…when explaining BJTs.…But it's important to recognize…that this is a major simplification.…
If you try to understand how a transistor can behave…like two diodes,…
- Semiconductor materials
- Diode applications
- Rectifying a signal
- Detecting the signal peak
- Protecting against large signals, reverse current, and flyback voltage
- Special purpose zener diodes, Schottky diodes, and photodiodes
- NPN and PNP bipolar junction transistors
- Using a BJT as a switch
- Field effect transistors
- Differences between BJTs and MOSFETs
- Operational amplifiers
- Op-amp applications
- Comparing signals
- Buffering signals
- Amplifying signals
- Filtering signals
- Combining signals
Skill Level Intermediate
Learning to use MakerBot 3D Printerswith Kacie Hultgren1h 5m Appropriate for all
2. Diode Applications
3. Special Purpose Diodes
4. Bipolar Junction Transistors
5. Transistor Applications
6. Field Effect Transistors
7. Operational Amplifiers
Feedback circuits6m 30s
8. Op-Amp Applications
Next steps1m 9s
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