herein but should not be construed to be limited to these disclosed embodiments as other will be apparent to those skilled in the art split bobbin transformer designs are commonly configured with a core geometry that isolates the primary and secondary windings onto adjacent bobbins surrounding the same core segment in conventionally designed split bobbins with this configuration the core center leg segment which extends through both bobbins has a given cross section dimension diameter or width in an embodiment of the invention split bobbin transformers with both bobbins surrounding the same core segment the core is configured with multiple such widths which effectively increases the primary winding minimum axial distance from the core center as compared to the secondary winding minimum winding axial distance fig3 shows a cross section view of a split bobbin configuration consistent with this embodiment shown in fig3 are the primary high voltage bobbin 301 and secondary low voltage bobbin 302 which are shown with the respective primary windings 303 and secondary windings 304 in place also shown in fig3 is an exemplary configuration of the winding core 307 which positions the split bobbins 301 and 302 with the chosen differential minimum axial winding distance 305 and 306 for the primary and secondary windings from the core center axis 308 also in accordance with this embodiment configuration the split bobbin window widths 309 and 310 may be adjusted to compensate for the change in window height such.