Between the audio-amplifier outputs and the output jack, you may find a small EMC (electromagnetic-compatibility) filter, consisting of an inexpensive ferrite bead and a low-value ceramic capacitor ...
Devices that plug into an AC mains outlet need protection from EMI. A Pi filter, as shown in Figure 1, is often used for this application. Safety standards exist to protect people and equipment should ...
Listen to the pop, sizzle, and hum. Look at the bars and wavy lines. These and other characteristics of electromagnetic interference (EMI) are very familiar. RF energy is radiated from a culprit ...
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