● The drum inductor is like a "Drum" in appearance, generally it's a kind of plug-in component. Wind a coil on the drum-shaped ferrite core as per practical demand, reserve two pins and cover the body with heat-shrinkable tube, then a drum inductor is finished. Different producers usually have different winding methods, due to the possibility of bigger volume and the various choices of ferrite core material, the rated current and inductance can be increased to the value needed. Thus, drum inductor has features of high power, high saturation, low impedance, high Q value, automatic plug-in installation, etc.

● Drum inductor's common problem of abnormal sound and noise is related to not only magnetic parts but also technique like winding condition and tightness. And what causes the abnormal sound of inductor may also have something to do with circuit design or strategy, and sometimes the mismatching of frequency.