Originally Posted by coolplazma
HiFiFun, you snuck the above comment in among many others in the same post. What are you basing your statement on?
This thread is so funny as certain few try to dominate it completely.
You were told I was ignorant then same replied to your question clearly directed to me. Has anybody seen the learning robot on the island in The Incredibles?
There are many aspects answers your question. Its actually an entire engineering field where electrical products are tested for Electro Magnetic Interference and Radio Frequency Interference susceptibility.
In fact the FCC requires projects to be EMI/RFI tested and certified.
Here are some design tips:
0) Simplify and reduce component count
1) Every cable is an antenna, so for home theater and networks always hard wire if possible. For a new house pay the bucks to wire every room with CAT 5E or 6
2) Buy a home far away from the large transmission tower farms. Don't live in RF saturated high-density housing.
3) The laminate foil in roofing material also acts as a nice RF shield.
4) Isolate the components from each other, both electrically and physically.
5) reduce component count to simplify system grounding. Wall warts are generally bad. Satellite and cable receivers are among the worst with lots of emissions.
6) I use htpc's supplemented with wirelesses notebooks and tablets. My "smart" electric meter now generates RF too! Note: stay away Google!
7) Individual components power conditioning needs to be tailored, especially the display. I like to isolate the displays with the Furman Power Factor Pro on its on leg from the wall socket.
8) Audio can really suffer as the RF (internal and external) easily interferes with analog semiconductors. As a result, my receiver has no digital to analog converter, as the HDMI PCM signal is converted to digital PWM. This drives the 120watt Class D power amplifier stages.
Of course there is a lot more but I want to wait a few days and see this in reprint first.