At low frequencies ferrite beads act as inductors, which oppose changes in current. One major problem to look out for when using a ferrite bead like this is LC resonance.įirst things first, if you’re using a ferrite bead in the power supply line of your circuit you need a bypass capacitor. Then you get what is essentially an LC (inductor and capacitor) filter. While a bead by itself can’t make a low pass filter, when combined with a bypass capacitor it can. Above that band their inherent capacitance frequency takes over. They do block high frequencies, but only in a specific band. Designers are often tempted to think of ferrite beads as low pass filters.
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