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What is this on a 12VDC power cord?

Discussion in 'General Electronics Discussion' started by bobc, Jul 31, 2011.

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  1. bobc

    bobc

    4
    0
    Jul 31, 2011
    I am converting a motherboard's power supply to run on a 12VDC battery and am curious about the component on the end of the existing power cord coming from the AC/DC transformer.

    I have attached an image - can you tell me what it is? Capacitor maybe?

    Will a component like this be necessary if I am using a battery, instead of the AC/DC transformer?

    Thanks,

    --Bob
     

    Attached Files:

  2. daddles

    daddles

    443
    3
    Jun 10, 2011
    It's a ferrite choke to help the device meet its RFI specifications.
     
  3. bobc

    bobc

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    0
    Jul 31, 2011
    Thanks!

    From what I've read on a few websites this filters out the RFI caused by AC - so for a battery powered system I don't need one - right?

    --Bob
     
  4. poor mystic

    poor mystic

    1,074
    33
    Apr 8, 2011
    ...right. :)
     
  5. Resqueline

    Resqueline

    2,848
    2
    Jul 31, 2009
    RFI is caused by RF energy (usually an AC component) but AC in this context does not refer to mains AC. RFI can just as well occur in battery powered systems.
    These RFI measures are applied just as much for preventing RF from radiating out into the power supply as to prevent RF from going into the device in question.
    It basically prevents the wire & PSU to work as an antenna. The device itself will no doubt work just as well without the ferrite core in >99.99% of the cases.
     
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