A transformer has a toroidal core with an opening therein and a plurality of wires to define a central winding section, a plurality of outer twisted wire sections and a plurality of wire proximity sections positioned between each outer twisted wire section and the central winding section. The central winding section includes a plurality of wires wrapped around the toroidal core and coupling a conductor of a primary side of a transformer and a conductor of a secondary side of a transformer. Each outer twisted wire section includes at least a pair of wires twisted together in a predetermined twisted pattern that are electrically connected to but spaced from the central winding section. The wire proximity section is configured to maintain physical proximity between the conductor of the primary side of the transformer and the conductor of the secondary side of the transformer.