step down transformer magnetics isolation transformers STEP DOWN TRANSFORMER Dyco Electronics is a manufacturer of horizontal and vertical mount, step up and step down transformer. Dyco designs prototype transformers for commercial & military applications, aircraft communications, and medical & ind. J-STD-001 certified soldering instructor are available on-site. A transformer is a device used in an electrical circuit that changes a voltage on the primary winding to another voltage level on the secondary winding(s). This transformation is accomplished via a mutual coupling effect between the primary winding and secondary winding(s), with the magnitude of change determined by the turns ratio between the windings. If the primary winding contains more turns than the secondary winding, then the voltage induced in that secondary winding will be decreased by an amount equal to the turns ratio between the primary & secondary winding, a transformer that does this is referred to as a step down Transformer. Whereas in a transformer that has a primary winding with less turns than the secondary, then the voltage induced in the secondary winding is increased by an equal amount to the turns ratio, this device is called a Step Up Transformer.