toroidal transformer voltage transformer 3 phase transformer TOROIDAL TRANSFORMER Dyco Electronics is a manufacturer of the toroidal transformer, reactor, inductor, MPP, ferrite, tape wound, iron powder, common mone, bank wound, pulse transformer, hand wound, hook wound. Design svc A toroidal transformer is known to be one the highest performing transformer. A toroidal transformer has the smallest size (by volume and weight), inferior leakage inductance, and an electromagnetic interference (EMI) that is much lower. The use of a toroidal transformer is good for any transformer application that can accommodate its shape. Although usable, a toroidal transformer are not always practical for some applications.