The new core configuration called the C-I Core ( Patent pending ) combines the advantage of low cost laminations requiring expensive tooling and those of cut cores which are more expensive to manufacture but requires only simple low cost tooling.

The C-I core configuration is made of one cut core ( rectangular, toroidal or any other shape) and one laminated "I" bar as shown in Figures 3a & 3b.

The core in its final assembly has the same shape as an EL, EI, or F stamped lamination and is similar to the configuration of a double C-core.

The C-I core can be made of .001" thick material or greater (up to .014"), using Grain Oriented Silicon iron, Nickel iron or other Crystalline steels. It offers the designer of transformers and inductors flexible dimensions, high frequency range up to 20KHz, and low cost tooling.