Sound card in the expansion slot
But what do you do if an internal sound card is also plagued by noise? I wasn’t the only one with this problem and a forum entry about such a phenomenon put me on the right track. It didn’t help: I moved the SoundblasterX AE-5 Plus to another slot, added additional shielding to the top… There was simply nothing to be wanted, it zipped. Until I came up with the idea of unscrewing the slot cover as a test and plugging the card in like this. And you know what? The noise was suddenly gone! The same on my acrylic benchtable: no more noise.
The reason is quite simple, because there are extreme ground loops in the housing, as I was able to prove to you yesterday on the isolated benchtable. If you now add the housing as an additional ground conductor, then good night! Let’s first measure between the graphics card bracket and the ground field around the CPU, which can be easily solved using the small metal backplate under the socket:
If I can measure a voltage difference of around 5 mV between the slot bracket of the graphics card and the slot bracket of the SoundblasterX, then this should definitely be a wake-up call. These are already huge potential differences if you bear in mind the magnitude of the currents measured in yesterday’s article.
Of course, such a free installation is not particularly stable or recommendable. What you can do, however, is simply unscrew the slot cover and coat it with a suitable transparent varnish to create electrical insulation at all contact points. Then you can reassemble everything and that’s it with the noise. Alternatively, you can also try using transparent adhesive tape. However, the use of a nylon screw or cable tie to secure the housing is absolutely essential.
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