Looking at a particular ferrite beads datasheet (broken link removed), I see that. If I wanted to replicate the same circuitry as a Ferrite Bead (inductor with a resistor in series), how would I go about calculating the inductance. The calculators below can be used to determine the proper parameters for either a circular or square cross section Toroid inductor. Credit for the initial Javascript code used in the calculator is given to Ray Allen who has a number of similar useful calculators on his website, Pulsed Power Portal. From my understanding of Ferrite Beads, it is typically specified by an impedance value 100 MHz. Where N is the number of turns, h is the height of the winding (in cm), r 1 is the inner radius (in cm), and r 2 is the outer radius (in cm). However, the ferrite- and powdered-iron slug-tuned core coils are adjustable. The air-core coils are not adjustable unless either an expensive roller-contact mechanism or clumsy taps on the winding of the coil are provided. Alternate Equation for a Square Cross Section Toroid Inductor Tuning inductors can be either air-, ferrite-, or powdered-iron-core coils.
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