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Buzzing sound from switching PSU's?

Discussion in 'Electronic Repair' started by Chaos Master, Aug 7, 2004.

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  1. Chaos Master

    Chaos Master Guest

    Hi. Sorry for the crosspostings

    I've recently noticed a noise coming from one of those small fluorescent (sp?)
    lamps, that sounds like a high-frequency (~1KHz) buzzing. As I understand,
    fluorescent lights use SMPS (switching) power supplies.

    This buzzing sometimes also happens in my PC PSU (I've discarded fan noise) and
    in the monitor (from the Flyback, it seems).

    The buzzing is barely noticeable but gets noticeable when monitor + lamp + CPU
    is on :/

    Q: Is a little buzzing sound coming from SMPS, means any problem? The
    lamp/monitor/CPU work normally, so the SMPS is not problem.

    I've readed that it's from either the SMPS controller (???) or the magnetics.

  2. Hi!
    Generally speaking, no. It usually indicates a supply that may be a little
    cheap or undersized to the load its carrying. For older supplies it might
    indicate a minor problem getting ready to occur, but generally you don't
    have to worry about it.

  3. Chaos Master

    Chaos Master Guest

    William R. Walsh, William R. Walsh, William R. Walsh.... did you really write
    So good. It's because my PC PSU is old (AT PSU for a 200MHz Pentium), and the
    fluorescent lamp is of an 'unknown' brand (the lamp was very cheap).

  4. Dunny Rummy

    Dunny Rummy Guest

    Get a Antec 550 true power PSU and never worry again

  5. Triffid

    Triffid Guest

    O K ;-)
  6. Chaos Master

    Chaos Master Guest

    Dunny Rummy, Dunny Rummy, Dunny Rummy.... did you really write this article
    1. AT PSU
    2. I don't need 550W as I am not into CPU overclocking nor do I need a 'high
    power' video card. 350W or so is enough for me

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