Tuesday, 14 November 2017

operational amplifier - Driving blue LED with 3.3V using an op-amp


I'm trying to design a circuit that drives six LEDs - two red, two green, and two blue - off a 3.3V GPIO pin. Since the voltage drop on a blue LED is in that range, I'm attempting to step the voltage up with an LM318N and then drop it with a resistor. However, all the red and green ones are working when set up like this, but the blue ones are not.


LM318N LED config


Is this a reasonable setup to accomplish what I'm going for, or is there something wrong with the way I'm approaching this?




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