Monday 7 August 2017

linear - Light intensity and photodiode current


Recently i am using a LED as a photo detector . Follow by this instruction : http://makezine.com/projects/make-36-boards/how-to-use-leds-to-detect-light/


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An opamp is used to convert the photocurrent from an LED into a proportional voltage (Vo) The author stated that "The Linear Technology LT1006 single-supply op-amp (IC1) provides a voltage output (Vo) that’s almost perfectly linear with respect to the intensity of the incoming light"


So is that true that Vo is linear proportional to light intensity ?




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