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Broken Inductor Issue In Radio Mic

Discussion in 'Troubleshooting and Repair' started by Mark Treleaven, May 24, 2017.

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  1. Mark Treleaven

    Mark Treleaven

    3
    2
    May 24, 2017
    Hi Everyone

    I am new here, I am in the UK but I need a little help

    I am repairing a UHF wireless microphone set by KAM, its a KWM Quartet

    One of the microphones is not powering on at all, I have checked the usual suspects, batteries, battery terminals, on/off switch etc and they are all fine.

    I took the microphone apart and noticed there is a component broken off the board, I know where is goes, and what type of component it is, but I do not know how to get the right value component to replace it.

    I believe it is a 47uH (0.047 mH) inductor (it has 470 stamped on the top) but no other markings
    I do not know the max voltage or amperage for the new component, or even who makes this broken one so I can at least get a like for like replacement.

    The microphones take 2 x AA 1.5V batteries (so 3V) and the UHF transmission freqency is 864.99MHz

    Thanks in advance for any help given

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    [mod edited ... moved out of some one elses thread and tidied up images]
     
    Last edited by a moderator: May 24, 2017
  2. davenn

    davenn Moderator

    13,837
    1,951
    Sep 5, 2009
    yes



    for a small battery powered unit like that, those ratings are irrelevant

    do some searching on Farnell, Element 14, Digi-key, Mouser and similar places
     
    Last edited: May 24, 2017
  3. Mark Treleaven

    Mark Treleaven

    3
    2
    May 24, 2017
    thank you, I have ordered a replacement from Farnell
     
    davenn likes this.
  4. Mark Treleaven

    Mark Treleaven

    3
    2
    May 24, 2017
    Just a quick update
    The replacement inductor arrived today, just soldered it in place, and WooHoo the microphone works again.
    Thanks again for all the help.
     
    davenn likes this.
  5. davenn

    davenn Moderator

    13,837
    1,951
    Sep 5, 2009

    good to hear

    well done :)
     
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