Abstract: An inductive component, such as a transformer, is made by applying conductive tracks onto a thin, foldable substrate (10) and then Z-folding the substrate so that the conductive tracks from a coil. A ferrite core is then placed through the coil. In order to maximise the current capacity of the transformer, there are electrical connections between leaves not only around each fold line (14) where the track traverses the fold line, but also between specially prepared areas X-X of the tracks which end up facing each other from adjacent folds once the substrate has been folded.