![2N2222 NPN Transistor as a switch - Arduino example with LED Flash | Electromechanical engineering, Arduino, Transistors 2N2222 NPN Transistor as a switch - Arduino example with LED Flash | Electromechanical engineering, Arduino, Transistors](https://i.pinimg.com/564x/95/f6/c3/95f6c3a48ac71764fdaa9ee16a4ab47b.jpg)
2N2222 NPN Transistor as a switch - Arduino example with LED Flash | Electromechanical engineering, Arduino, Transistors
![Using the linked LED circuit, do transistors (BJT, MOSFET, etc) really amplify currents/voltages, or do they just create a closed circuit which has an external voltage supply? - Quora Using the linked LED circuit, do transistors (BJT, MOSFET, etc) really amplify currents/voltages, or do they just create a closed circuit which has an external voltage supply? - Quora](https://qph.cf2.quoracdn.net/main-qimg-f4767687ffdec88c4a7b045e57889ef7.webp)
Using the linked LED circuit, do transistors (BJT, MOSFET, etc) really amplify currents/voltages, or do they just create a closed circuit which has an external voltage supply? - Quora
![Does this circuit work for using a transistor as a switch for controlling an LED with an external power supply? Thanks. : r/AskElectronics Does this circuit work for using a transistor as a switch for controlling an LED with an external power supply? Thanks. : r/AskElectronics](https://i.redd.it/js9j6v5qqb2b1.jpg)
Does this circuit work for using a transistor as a switch for controlling an LED with an external power supply? Thanks. : r/AskElectronics
![transistors - GPIO failing to drive 2N2222 & LED simultaneously - Electrical Engineering Stack Exchange transistors - GPIO failing to drive 2N2222 & LED simultaneously - Electrical Engineering Stack Exchange](https://i.stack.imgur.com/YK0Gv.png)