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help with night light circuit.

Discussion in 'Electronic Design' started by Chris, Jul 21, 2003.

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  1. Chris

    Chris Guest

    I'm not actually making a night light but i want to know how it is done.
    I'm talking about the kind of night light that turns on when the photodiode
    senses an absence of light. I was hoping for a simple component that acted
    this way but as far as i know all there is is photo resistors, photo
    transistors, and photo diodes; all of which allow current to flow in the
    presence of light. So now I assume that some sort of logic chip is used. I
    suppose a reed switch could be used but that doesn't like the best choice.

    So. What I would like to know, if my assumptions are correct, is: What are
    these nightlight circuits composed of and what is the best way to design the
    same thing for a 3.3V circuit?
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