SWITCHING TRANSFORMERS- A line of custom and semi-custom switching transformers from Sanken Electric Co. Ltd., Japan, is now offered through their wholly-owned subsidiary Allegro MicroSystems Inc., Durham, NC. The transformers' high-performance ferrite cores and superior winding technology are said to result in a reliable product that's suitable for a wide variety of applications. Units are designed for applications in computers, color monitors, television sets, electronic ballasts, VCRs and more. They offer high flux density, high permeability, low power losses and reduced heat generation. All are built for ease of installation on pc boards.