I own a 5-port 3Com OfficeConnect Gigabit Switch 5 (3C1670500A), which made the annoying high-pitched sound as described in posting about other type of 3com switches here. Altough it's not very loud, it is well hearable at about 1 m distance. At least loud enough to drive me nuts. I contacted the 3com product service, but I guess they did not (want to?) understand what the problem was.
I searched the internet and I found this forum, where I saw I was not the only one with such a problem.
In order to make the switch completely silent, I changed two things:
1. Put the coil which is part of the dc-dc converter into a (violin) resin bath
2. Replaced a Michicon 6.3v, 1000uF capacitor, which was placed next to the coil, with an ELNA 6.3v, 1000uF.
I have to say, I am not really sure whether it was necessary to put the coil in a resin bath. Perhaps the only noise making part was the capacitor. The reason for this is that just out of curiosity I tried to put the Michicon capacitor back some days later, but the sound problem reverted as well with that. So one might give it a try to first only replace the capacitor, instead of coil as well as capacitor.
Please see the picture below for details:
I hope this will help. Good luck.
w_m0zart
I searched the internet and I found this forum, where I saw I was not the only one with such a problem.
In order to make the switch completely silent, I changed two things:
1. Put the coil which is part of the dc-dc converter into a (violin) resin bath
2. Replaced a Michicon 6.3v, 1000uF capacitor, which was placed next to the coil, with an ELNA 6.3v, 1000uF.
I have to say, I am not really sure whether it was necessary to put the coil in a resin bath. Perhaps the only noise making part was the capacitor. The reason for this is that just out of curiosity I tried to put the Michicon capacitor back some days later, but the sound problem reverted as well with that. So one might give it a try to first only replace the capacitor, instead of coil as well as capacitor.
Please see the picture below for details:
I hope this will help. Good luck.
w_m0zart
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