The Slot7 from Coilcraft are Tunable Inductors with inductance values from 100 nH to 250 µH. They operate over a wide range of frequencies and are tuned by slotted ferrite tuning cores for easy, positive adjustment. These inductors are available in 7 mm packages with precision-molded slotted bobbins to ensure tight tolerances and high stability and include a metal can that provides electrostatic shielding. The ferrite sleeve on these inductors provides higher inductances and additional magnetic shielding.
