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Thread: Circuit for a HEIL HC-5 Dynamic mic module

  1. #1

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    Default Circuit for a HEIL HC-5 Dynamic mic module

    Hi,
    I won a HEIL HC-5 dynamic mic in a club raffle. Does anyone have a circuit diagram for it please?
    Cjheers, Camerart.

  2. #2

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    Quote Originally Posted by camerart View Post
    Hi,
    I won a HEIL HC-5 dynamic mic in a club raffle. Does anyone have a circuit diagram for it please?
    Cjheers, Camerart.
    Its just a coil of wire inside with a 2000ohm impedance. Since most radios have microphone input impedances of 600ohm, you will want to find an audio transformer to go between the two. Thats a nice mic!

  3. #3

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    Hi B,
    Simple, I should be able to make that.

    Thanks, C.

  4. #4

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    Quote Originally Posted by camerart View Post
    Hi B,
    Simple, I should be able to make that.

    Thanks, C.
    You should consider the Lundahl LL1571 transformer in the series-series configuration as the turns ratio of 1:1.75 is closest to the ideal turns ratio of 1:1.83 for achieving a 600 to 2kohm match. Lundahl makes excellent audio transformers and, IMO, using anything homemade on that nice of a mic element would be a total waste of that microphone.

    https://www.lundahltransformers.com/microphone/

    https://www.lundahltransformers.com/...heets/1571.pdf

    Good luck!
    73! B

  5. #5

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    Quote Originally Posted by brandon lind View Post
    You should consider the Lundahl LL1571 transformer in the series-series configuration as the turns ratio of 1:1.75 is closest to the ideal turns ratio of 1:1.83 for achieving a 600 to 2kohm match. Lundahl makes excellent audio transformers and, IMO, using anything homemade on that nice of a mic element would be a total waste of that microphone.

    https://www.lundahltransformers.com/microphone/

    https://www.lundahltransformers.com/...heets/1571.pdf

    Good luck!
    73! B
    Hi B,
    I look them up and probably take your advice, thanks.
    C

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