Trimmable coil assembly and method.

摘要

A microcoil (10) having a winding (16) on a composite core made up of a portion (11) of substantially magnetic material and a portion (12) of substantially non-magentic material. The winding is split so that a part (17) of the magnetic material core portion is exposed, and a laser is preferably used to remove material from the exposed part of the magnetic core portion preferably forming a groove (21). The inductance of the coil is measured during the removal of the magnetic material, and the inductance of the coil is trimmed to a desired value through the removal of an appropriate amount of magnetic material. The non-magnetic core portion serves as a support structure for the portions of the winding on the core even if a substantial portion of the magnetic material is removed.