What are these black things that have come loose?

Discussion in 'General Electronics Chat' started by bleeP, Apr 9, 2015.

  1. bleeP

    Thread Starter New Member

    Apr 9, 2015
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    Hi!
    What are these:
    [​IMG]
    that belong here:
    [​IMG]
     
  2. MaxHeadRoom

    Expert

    Jul 18, 2013
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    They are designated L so appears to be inductors, or chokes.
    A single conductor threaded through ferrite beads.
    Max.
     
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  3. bleeP

    Thread Starter New Member

    Apr 9, 2015
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    Thanks for info, now i would like to ask some further advice. Is there any possibility i could join them back where they belong to? If not, i would like to ask for advice on what do i exactly need to buy so i can get identical part.
     
  4. MaxHeadRoom

    Expert

    Jul 18, 2013
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    It looks like all you would need to do is thread a new conductor through the bead and resolder to the board, if my original theory is right.
    Max.
     
  5. cmartinez

    AAC Fanatic!

    Jan 17, 2007
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    You just might.. if you're able to resolder the tips to the board...
    On the other hand, most probably they came loose because vibration fatigued the wires, so I'd suggest you glue them with some polyurethane paste after you make sure that they've been properly re-attached and everything else is fully functional again.
     
  6. MaxHeadRoom

    Expert

    Jul 18, 2013
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    It looks like the single copper core fractured, so if it were me I would rewire it, and as cmartinez said, a dab of silicone rubber etc.
    Max.
     
  7. bleeP

    Thread Starter New Member

    Apr 9, 2015
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    Actually they became loose because the USB port you can see in the picture was pushed back and forced them loose.
    Thanks for all the tips so far, i'm still a bit unsure how to proceed because of my poor experience with electronics, so i need to ask some rather stupid questions.
    Should i get some tin and attempt to solder these back in?
    Sorry MaxHeadRoom but i don't entirely understand what you mean by rewiring (i'm not a native english speaker), can you please describe the process more?
    Also i'm still wondering about what these exactly are, and what do i need to buy if i need to get new parts.
     
  8. MaxHeadRoom

    Expert

    Jul 18, 2013
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    They appear to a single core solid copper conductor with PVC (or) insulation, if so, obtain another piece of roughly the same gauge and thread the the ferrite cores on and re-solder to the board, although it sounds as though you are not familiar with the process?
    You may find that something such as single conductor Telephone cable may be the same gauge copper that you could use.
    Max.
     
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  9. KJ6EAD

    Senior Member

    Apr 30, 2011
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    Last edited: Apr 9, 2015
  10. bleeP

    Thread Starter New Member

    Apr 9, 2015
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    No they don't have any markings. I suppose i need to know more about the component so i could buy new one?
     
  11. MaxHeadRoom

    Expert

    Jul 18, 2013
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    It seems to me all you need is to remove the existing conductor, even if you have to use a small drill or? to do it and replace with a fresh copper conductor.
    Any substitute may be the wrong ferrite material value.
    On the surface it seems like a trivial exercise?
    Max.

     
    Last edited: Apr 10, 2015
  12. ian field

    Distinguished Member

    Oct 27, 2012
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    Those ferrites are most likely lossy enough to glow red in the microwave (and probably crack the rotating dish if you're not careful) it doesn't have to get that hot to destroy the epoxy. OTOH: pre-assembles ferrite beads are so common with all the EMC directives, it shouldn't be all that difficult to find some salvage replacements.
     
  13. paulktreg

    Distinguished Member

    Jun 2, 2008
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    It would be nice to know your location.

    A very similar component is available from CPC here in the UK.
     
  14. bleeP

    Thread Starter New Member

    Apr 9, 2015
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    Thanks for that link, it looks like i can order that component from a local supplier.
     
  15. ian field

    Distinguished Member

    Oct 27, 2012
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    Someone told me CPC was connected with Farnell.

    Farnell has facilities in a lot of countries.
     
  16. paulktreg

    Distinguished Member

    Jun 2, 2008
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    Yes. Farnell own CPC in the UK.

    Available from Newark here.
     
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