Abstract: A transformer winding having a very large number of turns of wire is divided into a plurality of connected portions each wound on a separate flanged bobbin with the start end and the finish end of each winding portion secured to radial tabs on the bobbin flanges. The wound bobbins are mounted end to end on an iron core and the winding portions thereon are connected in series. Alternate methods of connecting the winding portions in series are also disclosed.

Abstract: A bobbin wound electrical coil assembly wherein external leads connected to the coil ends are secured in the flanges of the bobbin. Connector terminals connecting external lead ends and coil ends are fixed in sockets formed in one bobbin flange to preclude pulling stress on the coil end connections, and slots in the periphery of the other bobbin flange receive portions of the external leads spaced from their connected ends. A snap-on insulating cover having tabs which engage holes in the flanges of the bobbin extends between the bobbin flanges and over the external leads to cover the connections and to retain the external lead portions in the slots in the bobbin flange.