When a BJT is being used as a switch to turn on a LED, why does the LED not turn on when the base is short to the ground? - Quora
![LED Driver / circuit search with special specifications - Support - Engineering and Component Solution Forum - TechForum │ Digi-Key LED Driver / circuit search with special specifications - Support - Engineering and Component Solution Forum - TechForum │ Digi-Key](https://aws1.discourse-cdn.com/digikey/original/2X/3/3d5fc1b4fb173b3e460ad5ca7a7f3b00454e7e03.png)
LED Driver / circuit search with special specifications - Support - Engineering and Component Solution Forum - TechForum │ Digi-Key
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
![NPN LED Driver - Why an extra resistor to ground at the Base? | Electronics Forum (Circuits, Projects and Microcontrollers) NPN LED Driver - Why an extra resistor to ground at the Base? | Electronics Forum (Circuits, Projects and Microcontrollers)](https://i.imgur.com/uiVisGR.jpg)
NPN LED Driver - Why an extra resistor to ground at the Base? | Electronics Forum (Circuits, Projects and Microcontrollers)
![What is a purpose of BJT in an LED driver circuit with MOSFET? - Electrical Engineering Stack Exchange What is a purpose of BJT in an LED driver circuit with MOSFET? - Electrical Engineering Stack Exchange](https://i.stack.imgur.com/Rbahr.png)
What is a purpose of BJT in an LED driver circuit with MOSFET? - Electrical Engineering Stack Exchange
![transistors - High side or low side LED driver with NPN BJT? Which is better? - Electrical Engineering Stack Exchange transistors - High side or low side LED driver with NPN BJT? Which is better? - Electrical Engineering Stack Exchange](https://i.stack.imgur.com/tG8nQ.png)