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Thread: Anyone else hear a high pitched whine from their fenix uc35 v2?

  1. #1

    Default Anyone else hear a high pitched whine from their fenix uc35 v2?

    I just picked up a fenix uc35 v2 recently... great, BRIGHT little light. But on any of the medium three dimming levels, it emits a very high pitched whine like the old CRT TVs used to do, around 16KHz. I can hear it across the room, and it's pretty obnoxious. I emailed support and they said it wasn't normal and sent me a replacement, but the replacement does the same thing.

    Seems unlikely that I'd get two bad units in a row, so I just wanted to see if anyone else owned one and if it makes the same noise?



  2. #2
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    nbp's Avatar
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    Default Re: Anyone else hear a high pitched whine from their fenix uc35 v2?

    I think itís called inductor whine. Itís one of the components on the circuit board if I remember correctly. Itís not uncommon in a variety of lights.

  3. #3
    Flashaholic*
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    Default Re: Anyone else hear a high pitched whine from their fenix uc35 v2?

    I've only heard it from one of my lights: a 4sevens Quark. It's annoying, but I don't think it causes any problems. My hearing isn't that great, though, so perhaps it's more common than I think (just higher in frequency).

  4. #4
    Flashaholic* martinaee's Avatar
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    Default Re: Anyone else hear a high pitched whine from their fenix uc35 v2?

    I feel like I've had that before on lights, but so infrequently that I can't remember which one. And not loud like you are talking about. I think I thought I heard something once holding one up to my ear. But I definitely have experienced this with other electronics. I remember this with old CRT TVs. When I was younger I thought I had a superpower because I could hear that and my Dad couldn't haha.

    On your UC35 V2 does this only happen on a certain mode? I have to say the new Fenix lights with brass buttons look so nice. Stinks to hear if inductor whine is a thing on certain lights. We'll have to see.

  5. #5

    Default Re: Anyone else hear a high pitched whine from their fenix uc35 v2?

    Quote Originally Posted by martinaee View Post
    On your UC35 V2 does this only happen on a certain mode?
    Yeah it's most noticeable in the middle 3 modes (out of 5). I wouldn't mind it so much if it was only when I hold it to my ear, but it's actually pretty loud.

    I guess it's good to know my hearing is still good...

  6. #6
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    archimedes's Avatar
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    Default Re: Anyone else hear a high pitched whine from their fenix uc35 v2?

    Quote Originally Posted by nbp View Post
    I think itís called inductor whine....
    Yep, or "coil noise" or "coil whine" or electromagnetically excited acoustic noise and vibration
    ... is the archimedes peak

  7. #7

    Default Re: Anyone else hear a high pitched whine from their fenix uc35 v2?

    Interesting, thanks. I'm vaguely familiar with the concept in other electronic devices but I own a bunch of Fenix lights and have had the issue before...


    I wish it didn't bother me so much. I love the light otherwise. Does anyone have any recommendations for similar lights from other brands that don't whine? Specifically something usb rechargeable and 1000+ lumen.

  8. #8
    Flashaholic* martinaee's Avatar
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    Default Re: Anyone else hear a high pitched whine from their fenix uc35 v2?

    Does that light by chance use PWM on any modes? I wonder if that's at all related to the whine at all if so?

  9. #9
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    Default Re: Anyone else hear a high pitched whine from their fenix uc35 v2?

    Potted electronics are less likely to "whine" and, yes, PWM can drive whine.
    ... is the archimedes peak

  10. #10

    Default Re: Anyone else hear a high pitched whine from their fenix uc35 v2?

    I have that exact light, but I haven't heard that from mine.

  11. #11
    Unenlightened
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    Default Re: Anyone else hear a high pitched whine from their fenix uc35 v2?

    just ordered one i will let you know

  12. #12
    Flashaholic* thermal guy's Avatar
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    Default Re: Anyone else hear a high pitched whine from their fenix uc35 v2?

    My old Fenix TK 20 wines is so loud I can use it as a locator beacon. Some of my old HDS do this as well
    If i had one day left to live i would want to be at my workplace.Because every day is like a frickin eternity.

  13. #13
    Flashaholic Frijid's Avatar
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    Default Re: Anyone else hear a high pitched whine from their fenix uc35 v2?

    I had a black and decker 4aa spotlight I bought at Wal-Mart years ago that whined like that. I did it in one mode but not the other, I can't remember if it was the high or low. Did it for the 5 or so years I had it with eneloops and I used it often until I gave it away.
    ~Pray for the best, but prepare for the worst~

  14. #14

    Default Re: Anyone else hear a high pitched whine from their fenix uc35 v2?

    So 'potted' electronics are less likely to -whine- huh, ok I'll bite-there wouldn't be a maker of led flashlights that pots their electronics would there?

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