Abstract: A tunable differential disc capacitor having a pair of outer dielectric discs and an electrically conductive rotor element, plural paired electrically conductive portions disposed on the respective dielectric discs and spring clamp means electrically and mechanically connected to respective pairs of the conductive portions. A preferred embodiment has three such pairs of conductive portions and a corresponding number of spring clamp means, so that the rotor element can be moved to various positions with respect to the conductive portions, varying the capacitance values. Electrical connection can be made to a spring clamp connected to the rotor element and to either or both of the other spring clamps, thereby obtaining one or two trimmable differential capacitors. The device can be used with the capacitors connected in series or in parallel. A sealed housing is also provided.

Abstract: A tunable, extended range, multilayered ceramic chip capacitor for incorporation into a plurality of substrate designs of micro-miniature circuitry and hybrid integrated circuits, comprising a multilayered ceramic chip capacitor; said chip having an electrode pattern as both upper and lower electrode layers embedded within the dielectric, forming a homogeneous chip capacitor structure. The capacitance range of the said chip capacitor is extended by the addition of a rotor plate positioned over a portion of said electrode pattern by a rotor contact spring which also provides a rotor contact terminal, such that said rotor plate may be rotated over the stator portion of said electrode pattern to provide a precisely tunable extended range of capacitance, a stator terminal spring to provide means to grip said extended range chip capacitor and means for circuit connection.