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Condenser Mic Question

Discussion in 'Electronic Design' started by Spin, Dec 4, 2007.

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  1. Spin

    Spin Guest

    have a broken Marshall MXL USB mic which isn't worth getting repaired. The
    mic element is 32mm in diameter. Is it feasable to remove the condenser
    element & connect it directly into the mic input of my computer sound card?
  2. Phil Allison

    Phil Allison Guest


    ** Told you before - no.

    A condenser mic capsule is nothing more than a 20 to 100pF capacitor with
    one fixed and one flexible side.

    It needs DC polarising with 30 to 100 volts and a sensitive pre-amp with
    around a 1Gohm input impedance.

    ....... Phil
  3. GregS

    GregS Guest

    And in this case uses a fet near the element to get some juice
    going. I was starting to write capsule, and this certainly isn't a capsule.
    All the stuff should be allready be there minus the USB.

  4. Eeyore

    Eeyore Guest

    The fet has NOTHING to so with 'getting the juice going'. It's simply a very high input impedance
    buffer stage.

    Yes it is. A capsule is the precisely the correct name for it.

    The electret type you may be confusing it with is strictly speaking NOT a capsule becasue it also
    contains some electronics (like the aforementioned fet).

  5. Phil Allison

    Phil Allison Guest

    "Phil Allison"

    ** The FET is no use without the polarising voltage or a DC supply.

    ** The term " capsule" is commonly used for such things.

    Just distinguishes the transducer of a mic from the case / handle, matching
    transformer and/or internal pre-amp circuitry.

    ** Shame how power from the USB is used to operate the mic.

    ........ Phil
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