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    Coil whine issues

    Scheduled Pinned Locked Moved Hardware
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    • H
      H-Man
      last edited by

      Any suggestions on how to reduce coil whine? Glues and epoxy suggestions are welcome, but I want to try to reduce it on the software side too so that I can make the hardware solutions even more effective.
      My pfsense system is a socket 754 laptop with a Turion ML-40 (k8 at 2.2 ghz,) an ati RS480M chipset, a socket 939 CPU heatspreader attached to the CPU with thermal paste on the CPU and super glue at the edges once it settled, a scythe ninja fanless CPU heatsink held on with zip ties, 512 mb ddr, a 4gb usb flash drive, an atheros mini pci wireless interface as OPT1 (labeled ath0) interface bridged to LAN, a relteak onboard interface as WAN interface (labeled rl0,) a USB NIC as LAN interface (labeled ue0,) and no fans connected.
      I am having coil whine issues. The issue wasn't present in ubuntu x86.
      I have had the same coil whine on pfsense 2.0.1 and 2.1 (i386 nanobsd_vga)
      I'm not sure if it is just normal coil whine, or something else.

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      • T
        Tikimotel
        last edited by

        Can't you hide it in the attic? (or reduce the no. of USB devices attached)

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        • H
          H-Man
          last edited by

          Wouldn't be a very good idea. In the summertime the attic gets past 60 C and the router runs by my estimate 20C above ambient at idle. Removing the laptop battery resolved the issue.

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          • GruensFroeschliG
            GruensFroeschli
            last edited by

            It might help to enable/disable powerd.

            We do what we must, because we can.

            Asking questions the smart way: http://www.catb.org/esr/faqs/smart-questions.html

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            • stephenw10S
              stephenw10 Netgate Administrator
              last edited by

              Having a built in UPS is half the advantage of using an old laptop. Seems a shame to have removed it. Was the battery dead? Drawing more current than it should perhaps.
              I used to work for a company that made transformers and coils of various types. Occasionally noise was an issue and the solution was almost always to use a polyurethane potting compound. That stuff does not conduct audio frequency vibrations, like almost completely. However it also doesn't conduct heat, like almost completely!  ::) You had to take this into account at the design stage, just potting an existing inductor could easily lead to overheating and insulation failure.

              Steve

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              • H
                H-Man
                last edited by

                The battery is by my guess at least 7 years old. I tested the battery and it was dead, so I pulled it.
                I have a large UPS under my desk, so it isn't much of an issue.

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