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name & function of this component cover? (RF shield?)

Discussion in 'Electronic Basics' started by Adam Funk, Apr 25, 2013.

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  1. Adam Funk

    Adam Funk Guest

  2. Tom Biasi

    Tom Biasi Guest

    Sounds like you know what they are.
     
  3. Adam Funk

    Adam Funk Guest

    Well, it's nice to get it confirmed.
     
  4. Adam Funk

    Adam Funk Guest

    Thanks! What would they be called in a catalogue (for example)?
     
  5. Tom Biasi

    Tom Biasi Guest

    RF shield, but most are made to meet a particular design.
     
  6. "The perforated whatchamacallits".

    It almost sounds like a trick question, that somehow there should be
    something more than "shielding".

    Michael
     
  7. It'a not an off the shelf piece. A design is conjured up, it's layed out,
    and then that defines the size needed, so it's off to the machine shop to
    make the shielding. Obviously it's mass produced in commercial equipment,
    but since it's to fit the circuit, it's made for that circuit.

    If you were doing it at home, you'd get a metal bending break and bend
    some thin brass or whatever thin metal you could get cheap. Tin cans
    would offer up small pieces of metal that would work. Or someone else
    might solder bits of copper circuit board together to make small shielded
    compartments, again especially useful since you can make them to the size
    you need. If you weren't up to that, you'd buy miniboxes (now often too
    big) to build up isolated stages in.

    Or dig through the junk pile until you find something that is the right
    size. Older (and thus larger) IF transformers were once a source, once
    transistors came along. Copper pipe might be used, with end caps. I find
    myself often saving those bits of shielding from commercial equipment
    because they can make neat boxes for this. Anything that offers up a
    small box of about the right size is useful, though less likely to be
    found in today's electronic equipment.

    Michael
     
  8. Phil Allison

    Phil Allison Guest

    "Adam Funk"

    ** RF shielding is certainly the purpose - but the other way around.

    Those ICs inside generate RFI that could upset services like TV or Wi-Fi so
    the shielded box is to keep it in.

    ** The material is typically tin plated steel.

    So tin boxes will do.

    You see the same in most TV sets, VCRs and FM tuners - housing the tuner
    itself.


    .... Phil
     
  9. Adam Funk

    Adam Funk Guest


    Good one! Thanks, everybody.
     
  10. Adam Funk

    Adam Funk Guest


    Interesting, thanks.
     
  11. We get some things like that from leader tech.
    http://www.leadertechinc.com/
    I've just used the 'fencing' without the top... that was enough to
    stop capacitive feedback in a high gain amp.
    It all seems way over priced to me. I seem to recall ~$25 for a 2"x2"
    fencing and top.

    I also buy stuff from these guys,
    http://www.orbel.com/

    A little PCB shield 100 for ~$4 each. It was cheaper to design the
    circuit to fit under the shield than making a custom shield.

    George H.
     
  12. Fred Abse

    Fred Abse Guest

    In the days of the Founding Fathers, American English *was* British
    English. They subsequently diverged.
     
  13. I can't say I've heard that one before, but it works.

    After all, people have called "IF transformers" "IF cans" and obviously
    the "can" is in reference to the shield, not the actual transformer
    inside.

    Michael
     
  14. Fred Abse

    Fred Abse Guest

    Cite references.

    What decided the outcome of WWI was US industrial might, enabling the
    Allies to fight simultaneously on four fronts.

    I cannot understand why some, fortunately few, Brits,instead of expressing
    gratitude, indulge in criticism or derision, at every opportunity.
     
  15. Fred Abse

    Fred Abse Guest

    I'd have said that the British soldier was underpaid. Something to do with
    the class system.
     
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