Abstract: A pulse step modulator is provided that includes a plurality of series connected unit step modules, each including a DC voltage source and an associated actuatable switching means for, when actuated, turning ON the associated module to provide a unit step voltage. An output circuit is connected to the series connected modules for providing an output voltage to a load wherein the magnitude of the output voltage is equal to the sum of all of the voltage sources of the modules that are turned ON. A plurality of turn ON signals are provided with each serving to actuate one of the switches in one of the modules. A transformer is provided having an elongated core which has an axis of symmetry. A primary winding is coaxially wound about the core for a substantial portion of the axial length of the core. A plurality of secondary windings are coaxially wound about the core. Each unit step module includes one of the secondary windings.