Soft Comm C-20 Plugs

Discussion in 'Microphones, Speakers & Audio Processing' started by WH7WP, Dec 13, 2016.

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  1. WH7WP

    WH7WP Ham Member QRZ Page

    I scored a pair of Soft Comm C-20 stereo aviation headphones barely used for $25
    I would like to be able to plug into a Kenwood TM 231A. I want the hand mic usable
    as well as the mic on the headphones for either/or operation with a foot switch to key for the headphone mic.
    Separate box ?
    Any schematic ideas will be very welcome.
  2. KS2G

    KS2G Premium Subscriber QRZ Page

    I don't have first-hand experience with either the C-20 or the '231A, so a could be wrong.

    But looking at the specs on them I don't think they're easily compatible.

    The '231A needs a 600-ohm dynamic microphone, but the C-20 has an Electret Condenser mic that requires a drive voltage that's not available from the '231A mic connector.

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