Join Barron Stone for an in-depth discussion in this video Use a MOSFET as a switch, part of Electronics Foundations: Semiconductor Devices.
- [Instructor] MOSFETs are popular for building…electronically controlled switches…because of their incredibly high input impedance…at the gate terminal…and their ability to drive…high-power electrical loads.…The device or circuit that's controlling a MOSFET…doesn't need to provide much current…to operate the MOSFET as a switch.…It just needs to be able to raise…or lower the gate voltage enough…to put the transistor into the saturation or cutoff modes.…The circuit to create a low-side switch…with an in-channel enhancement mode MOSFET…has a lot in common with a circuit for a low-side switch…using an NPN bipolar junction transistor.…
The BJT has its emitter terminal tied to ground…and the MOSFET has its source terminal tied to ground.…The two transistors also have their respective…collector, or drain terminals,…connected to the electrical load…the switch is going to be turning on or off,…in this case a motor attached to a 12 volt power supply.…The difference between these two circuits…comes into play when connecting the base and gate terminals.…
- 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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