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DC Product Question.

  1. Jul 24, 2008 #1

    Kurdt

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    Is a product that requires a DC power supply but doesn't have any info on the polarity able to work with both polarities?

    I'd like to find out before I try it, lest I knacker my device.

    Thanks :smile:
     
  2. jcsd
  3. Jul 24, 2008 #2

    berkeman

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    In general yes, it would have a full wave bridge rectifier at the input, to provide "polarity insensitivity".

    What is the device? Can you provide a link to a datasheet or specification?
     
  4. Jul 24, 2008 #3

    Kurdt

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    Hey berkeman. Thanks for the reply. The best I can come up with is the following but its not exactly the same.

    http://catalog.belkin.com/IWCatProductPage.process?Product_Id=252506

    Mine has the same basic product code but looks slightly different. I think its an older model.
     
  5. Jul 24, 2008 #4

    berkeman

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    What does the power input opening look like? Is it a coaxial barrel jack/plug? Those are traditionally positive tip, but not always. There should be some indication of + or - tip, maybe just hard to see if it's molded into the plastic instead of shown on a label. Does the label on the bottom of the product not indicate the polarity of the power input?
     
  6. Jul 24, 2008 #5

    Kurdt

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    Just a power jack like these:

    [​IMG]

    No moulding in the plastic nothing around the power jack except "DC 12V/1.25A", and nothing on the sticker on the bottom. Unfortunately I don't have any of the documents that came with it. I normally keep all of them in a box file and I've been right through and of course the only ones I don't have are for this particular product.
     
  7. Jul 24, 2008 #6

    berkeman

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    Well, there's about a 95% probability that it's positive tip. You could try contacting their customer support folks to double-check. They should have a diode bridge inside (maybe open it up and check?), or at least a blocking diode to prevent knackering.

    Is contacting their support or opening it up an option?
     
  8. Jul 24, 2008 #7

    Kurdt

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    Yes I could contact them. Just thought it would be worth a go asking on here :biggrin:

    Thanks berkeman.
     
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