NPN LED Driver - Why an extra resistor to ground at the Base? | Electronics Forum (Circuits, Projects and Microcontrollers)
I have a PNP BJT and an LED driver (current sink, theoretically 20 mA and max 3.3 V). The LED driver is connected through an LED to the base of the BJT.
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![Activity: BJT device as a switch [Analog Devices Wiki]](https://wiki.analog.com/_media/university/courses/eps/eps_bjt-swt-f1.png?w=600&tok=a330f9 "Activity: BJT device as a switch [Analog Devices Wiki]")
Activity: BJT device as a switch [Analog Devices Wiki]
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I have a PNP BJT and an LED driver (current sink, theoretically 20 mA and max 3.3 V). The LED driver is connected through an LED to the base of the BJT.
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SOLVED] - LED Driver by using PNP transistor | Forum for Electronics
![SOLVED] - LED driving with 2 BJT's Current Source Circuit | Forum for Electronics](https://i.imgur.com/4e9sk.jpg "SOLVED] - LED driving with 2 BJT's Current Source Circuit | Forum for Electronics")
SOLVED] - LED driving with 2 BJT's Current Source Circuit | Forum for Electronics
