A circuit with a magnetically variable transformer having primary and secondary windings wound on a magnetic core wherein the transformer core with associated windings is placed in close proximity to an independently wound control coil. The novel process omits preliminary process step for preparing fine particle size of micronized amoxicillin trihydrate used subsequently in the granulation process known in the art, for example grinding or micronizing of said antibiotic. A plurality of annular features may be formed over the material, with the annular features crossing the lines.