Put light into an LED get current!?!!?? Turns out, YES, you can do that! This silly little circuit works as a kinda gnarly distortion circuit. I tossed it together on an impulse, and it worked much much better than the one other time I tried it.
If you feel like duplicating my work, be sure to decouple your op amp with a 100uF capacitor, seal the pairs of LEDs in some sort of light-proof substance (heatshrink is amazing for this), and you know what? Probably add a ground-reference resistor from the 2nd op amp + input to ground. Maybe 470K. This circuit had a few volts positive offset, which would make sense since I used a TL074. Or maybe ground the + input and wire the potentiometer as a variable resistor... but make it a 1Megohm potentiometer?
Just an idea or two.
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