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Photocell backwards / reversed

Discussion in 'Electronic Basics' started by Ryan, Aug 9, 2005.

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  1. Ryan

    Ryan Guest

    Is there an off-the-shelf version of a photocell that works in reverse
    compared to the common variety?

    I want something to come on when it is dark, and I don't want to use a
    relay in order to 'reverse' the position of the photocell.

    It would seem that folks only associate photocells as lamp/light
    controlling devices and this is the sole way I have found them to be

    If this item does not exist as stock, how much effort would it be to
    modify an existing model? If I need a few hundred of them, I wonder
    about getting them custom made. I can do circuits a little bit, but it
    requires quite a lot of studying beforehand.

    Thank you.
  2. Impmon

    Impmon Guest

    The closest would be to use light dependent resistor in conjunction
    with a transistor to make a "dark detector". I don't think there is a
    reverse photocell, they make energy from light not from dark.
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