hissing from a hub

From: Dwight K. Elvey <dwight.elvey_at_amd.com>
Date: Mon Nov 24 11:08:08 2003

Hi
 Pairs of switching power supplies often interreact to
make a sound like hissing. There may not be anything
wrong with it. Still the electrolytic leaking might
be a problem.
Dwight

>From: "Curt Vendel" <curt_at_atarimuseum.com>
>
>No fans.... Hmmmm, see its a design flaw ;-)
>
>
>Curt
>
>----- Original Message -----
>From: "Fred N. van Kempen" <waltje_at_pdp11.nl>

>> On Sun, 23 Nov 2003, Curt Vendel wrote:
>>
>> > Might be a fan has cracked a bearing, you should try using a wooden
>pencil
>> > or other non-conduct stick-like object and stop each of the fans and
>see if
>> > the noise stops, then you'll find the culprit.
>> OfficeConnect 8's dont have fans. They're little white boxes
>> with an external DC power supply (which, at least for the 240VAC
>> European version, sucks.) I assume it fried one or more of your
>> caps, probably the ones that try to flatten the voltage's curve :)
>>
>> "3Com - Just Say No!"
>>
>> --f
>>
>
>
Received on Mon Nov 24 2003 - 11:08:08 GMT