Will this photocell from a night light work for my project

Discussion in 'The Projects Forum' started by Isaac22, Jun 27, 2016.

  1. Isaac22

    Thread Starter New Member

    Jun 27, 2016
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    I have this old night light and it has a photo cell in in. I was wonderering will I be able to put 12 volts thru it or not. I have put in some pictures of it below image.jpeg image.jpeg image.jpeg image.jpeg
     
  2. Alec_t

    AAC Fanatic!

    Sep 17, 2013
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    The photocell will be ok on a 12V supply providing you limit the current that flows through it, using a suitable series resistor.
     
  3. Isaac22

    Thread Starter New Member

    Jun 27, 2016
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    But if I limit the amount of volts that go in I won't get 12 volts out right
     
  4. Alec_t

    AAC Fanatic!

    Sep 17, 2013
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    I said limit the current, not the voltage.
    The photocell shown looks like a conventional cadmium sulphide (CdS) light-dependent resistor. Whenever you use a resistor in a circuit, current passing through it will cause a voltage drop across it. That is the whole point of the photocell: the voltage drop is the signal that the light level has changed.
     
  5. Dodgydave

    Distinguished Member

    Jun 22, 2012
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    Have you got a circuit in mind you want to make?
     
  6. AnalogKid

    Distinguished Member

    Aug 1, 2013
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    Your question is missing some details, like what it is you are trying to do. If you want to run the light directly from 12 Vdc rather than plugging it into the wall, that is doable with a lot more information. If you want to remove the photocell and use it in a different circuit, we kinda sorta need to know about the circuit.

    ak
     
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