[sdiy] Using opamps as LED drivers

[Chris McDowell]

Howdy list, 

So, I picked up some bi-color LEDs to play with. To drive them, I put them in the feedback path of a non-inverting op amp configuration, which compensates for the LEDs' forward voltages and works great. LED from output to negative input, 1k resistor from negative input to ground. 

Is there any glaring reason why this method isn’t great for driving single LEDs? I hardly ever see it done. I generally would use a trim pot and npn driver to get accurate led indication, but now I’m feeling silly for doing so :) 

Cheers,
Chris