Advertisement
If you have a new account but are having problems posting or verifying your account, please email us on hello@boards.ie for help. Thanks :)
Hello all! Please ensure that you are posting a new thread or question in the appropriate forum. The Feedback forum is overwhelmed with questions that are having to be moved elsewhere. If you need help to verify your account contact hello@boards.ie

LED making a high-pitched ringing noise

Options
  • 25-08-2017 10:19pm
    #1
    Victor
    Registered Users Posts: 78,442 ✭✭✭✭


    I bought an LED bulb for a table lamp and I am getting a high-pitched ringing noise when it is on.

    I know florescents and some CFLs make noise, but is this usual?


Comments

  • Options
    #2
    Steve
    Moderators, Category Moderators, Entertainment Moderators, Sports Moderators Posts: 22,584 CMod ✭✭✭✭Steve


    No, not usual but not unexpected.

    All LED's ultimately operate on approx 0.7V DC, the method of dropping mains 240V AC to that varies greatly. The fact you can hear a noise would suggest a capacitor / resistor network is being used.

    Can you post a link to the model / part#?


  • Options
    #3
    Victor
    Registered Users Posts: 78,442 ✭✭✭✭Victor


    Osram

    LED Star
    Classic A60
    E27

    8W = 806 lm


  • Options
    #4
    [Deleted User]
    Posts: 5,238 ✭✭✭ [Deleted User]


    PWM carrier frequency possibly too.
    Lazy engineering using audible wavelengths.


Advertisement