Identify the component(s) that are noisy. these will generally be
Once you have found them, encase them in hot melt glue or a rubber
mastic compound. This will greatly reduce noise levels
On Sun, 2012-06-10 at 14:34 +0200, Stanislav Meduna wrote:
> On 10.06.2012 11:05, Jan Ceuleers wrote:
> > The hissing is louder if the network traffic involves the wireless card
> > than if it doesn't (Atheros AR922X), but there is also hissing for
> > purely wired network traffic.
> 99% of the time the hissing comes from some inductance in a power supply
> circuit, changing sound as the power needs (both absolute and structure)
> change. Depending on mechanical tolerances the same part can be louder
> or quiter.
> There is not much one can do about it. If the surface of the winding
> is accessible one can try to tighten a sewing thread around it. There
> are also impregnating solutions, but I doubt they can be reasonably
> used on parts already soldered in the board.