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Need MA to voltage help

Discussion in 'Electronic Basics' started by Jim, Oct 5, 2008.

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  1. Jim

    Jim Guest

    I have a sunlight sensor made up of 2 tiny amorphous solar cells in
    parallel, that I would like to use with a 0-5 volt data logger. These cells
    provide the spectral response I want.

    The cells together generate a maximum of 2.25ma of current in full sunlight
    that I need to convert to voltage.

    I have used a OP90 op amp in the past to do the same for other sensors, but
    only for microamp currents. I did the math to find the value of the
    feedback resistor for this, and come up with something like .0022 ohms which
    doesn't seem too workable. Either I am making a mistake in my math or maybe
    it isn't possible to do this conversion using a single op amp.

    Can someone give me an option for making this a>v converter for this 2.25ma

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