Join Barron Stone for an in-depth discussion in this video Use a BJT as a switch, part of Electronics Foundations: Semiconductor Devices.
- [Instructor] In electronics projects,…it's common to use a microcontroller board…like an Arduino or a Raspberry Pi…to control other devices, turning them on or off.…But, using an Arduino to control something else,…like an electric motor, is a bit more complicated than…simply connecting it to the Arduino's digital output pins.…For one, the motor probably requires a different voltage…than the Arduino's output.…My little DC motor is designed to operate at six volts,…but my Arduino only outputs a five-volt signal.…
Another problem is that the amount of output current…that an Arduino board can produce…is probably a lot less than I need to power my motor.…What I need here is for the motor to get its power…from a dedicated six-volt power supply,…but I need the Arduino to control when it's on or off.…To do that, I can use the transistor…as an electrically controlled switch.…To interface between the two components…and enable the Arduino to turn the power on or off…to the motor.…
Unlike a mechanical switch, which contains parts that…
- 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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