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AT&T DSL modem, get rid of high pitch noise?

Discussion in 'Electronic Design' started by John Doe, Oct 11, 2011.

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  1. John Doe

    John Doe Guest

    I have an AT&T DSL modem that they sent to me. SPEEDSTREAM 5100
    ethernet ADSL modem.

    It emits a high pitch squealing noise. It's barely audible, but
    it's unpleasant. Can anybody guess what that sound might be and
    tell me if there is something that can be done to stop it.

    I seriously don't want to use it, so I do not at all mind risking
    its destruction. Soldering is no problem here. Or maybe somebody
    knows of an effective physical shielding from the noise.

    I can ask AT&T, but... Nowadays, can you just go to the store and
    pick up a new similar modem to use with AT&T DSL Internet service?

  2. Sjouke Burry

    Sjouke Burry Guest

    A piece of switching power supply working at an audible
    Get a piece of tubing to act as a stethoscope, and move
    that around the components, to find out what produces the sound.
    Probably one of the coils involved.
    Then try to decrease the sound(glue or wax covering it?).
  3. Tim

    Tim Guest

    Yes definitely the SMPS. It will run that way for years. The sudden
    appearance of that noise, though, can indicate pending failure, as
    something may have gone out of tolerance. The sealing method mentioned
    earlier may solve the issue if it is a mechanical ringing of the coil.

    I haved a network hub that suddenly started singing years ago after a
    long power disruption, and that unit still running with no problems.

    Not everyone can hear that high a pitch sometimes, and I can identify
    with the OP hearing the squeal. I often hear CRT horizontal squeal and
    it can be very irritating indeed. Of course no one else in the room can
    hear it. The extended hearing range is an asset when I am diagnosing PSU
    in the PCs I service. I can hear the PSU loading down or oscillating
    prior to failure.

    - Tim -
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