Guys, hope someone could help me with the math, as I can't figure this out just yet. :blush: I plan on using a BC547B NPN transistor to switch On/Off a Super Bright Red Led. But I need to know the resistor for the LED and the resistor for the Transistor. I plan on using a Shift Register (74HC595) t…

Super Bright Red Led - BC547B Transistor, but which Resistors?

CrossRoads September 5, 2012, 3:03pm 5

Adjust resistor then:
(5V-Vf-Vf-Vce)/current = resistor

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