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Ferrite Pot Core

Discussion in 'Electronic Components' started by [email protected], May 4, 2009.

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  1. Guest

    We're trying to find a replacement ferrite pot core. The core is just
    like the type shown in this picture:
    http://www.electronicsurplus.com/objects/catalog/product/image/img70051.jpg
    It measures .439" in diameter, each half measures .130" tall.
    Also, it is marked 3B7.

    I haven't been able to find any this small.
    We only need small quantity, 1-5.
    Any ideas?

    Thanks,
    Steve
     
  2. Eeyore

    Eeyore Guest

    Well..... 3B7 is a grade of ferrite. You'll want the same or compatible.
    http://www.ferroxcube.com/prod/assets/sfmatgra_frnt.pdf

    You will have to identify the specific pot core from the dimensions. Since it's
    a Ferroxcube ferrite, I suggest you start there. A distributor might be able to
    help too.

    Graham
     
  3. Eeyore

    Eeyore Guest

    And check if it's been 'gapped'. Otherwise you'll have to start from scratch.

    Graham
     
  4. Ross Herbert

    Ross Herbert Guest

    On Mon, 4 May 2009 09:49:51 -0700 (PDT), wrote:

    :We're trying to find a replacement ferrite pot core. The core is just
    :like the type shown in this picture:
    :http://www.electronicsurplus.com/objects/catalog/product/image/img70051.jpg
    :It measures .439" in diameter, each half measures .130" tall.
    :Also, it is marked 3B7.
    :
    :I haven't been able to find any this small.
    :We only need small quantity, 1-5.
    :Any ideas?
    :
    :Thanks,
    :Steve

    Most likely a P11/7 with a zero air gap. If both halves are identical to the one
    on the right then it will be most likely be ungapped. If gapped, one half should
    have a threaded insert to take an adjuster slug.

    The current Ferroxcube data sheet doesn't include 3B7 material since this is
    obsolete. In 2003 they recommended 3H3 as its replacement, but as you will see
    from the data sheet 3H3 is also superseded. You should still be able to get them
    though.

    http://www.ferroxcube.com/prod/assets/p117.pdf
     
  5. Guest

    Thanks for the great replies. Neither side has threads, there was no
    adjuster slug. The dimentions add up, it does indeed look like a
    P11/7-3H3 will work.

    Thanks,
    Steve
     
  6. legg

    legg Guest

    Gapped parts often have labelling that refers to the intended AL value
    of an assembly. If just the material is marked, the part likely has no
    gap.

    RL
     
  7. Ross Herbert

    Ross Herbert Guest

    :On Tue, 5 May 2009 07:02:25 -0700 (PDT), wrote:
    :
    :>> On Mon, 4 May 2009 09:49:51 -0700 (PDT), wrote:
    :>>
    :>> :We're trying to find a replacement ferrite pot core.  The core is just
    :>> :like the type shown in this picture:
    :>> :http://www.electronicsurplus.com/objects/catalog/product/image/img700...
    :>> :It measures .439" in diameter, each half measures .130" tall.
    :>> :Also, it is marked 3B7.
    :>> :
    :>> :I haven't been able to find any this small.
    :>> :We only need small quantity, 1-5.
    :>> :Any ideas?
    :>> :
    :>> :Thanks,
    :>> :Steve
    :>>
    :>> Most likely a P11/7 with a zero air gap. If both halves are identical to the
    one
    :>> on the right then it will be most likely be ungapped. If gapped, one half
    should
    :>> have a threaded insert to take an adjuster slug.
    :>>
    :>> The current Ferroxcube data sheet doesn't include 3B7 material since this is
    :>> obsolete. In 2003 they recommended 3H3 as its replacement, but as you will
    see
    :>> from the data sheet 3H3 is also superseded. You should still be able to get
    them
    :>> though.
    :>>
    :>> http://www.ferroxcube.com/prod/assets/p117.pdf
    :>
    :>Thanks for the great replies. Neither side has threads, there was no
    :>adjuster slug. The dimentions add up, it does indeed look like a
    :>P11/7-3H3 will work.
    :>
    :>Thanks,
    :>Steve
    :
    :Gapped parts often have labelling that refers to the intended AL value
    :eek:f an assembly. If just the material is marked, the part likely has no
    :gap.
    :
    :RL


    It is very easy to determine gapped cores simply by aligning the two halves and
    holding them up to the light so you can see through the side slots. The gap in
    the centre leg of the core is quite noticeable. The P11/7 3B7 cores I have made
    by Philips pre 1990 have a threaded nickel plated insert in one half to allow
    for the adjusting slug to vary the final inductance value. The zero gap variety
    doesn't have the insert.
     
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