A frame relay protection method generates an OAM frame to other nodes upon detecting a defect on a SONET ring. The method includes introducing at least one molding material into a mold, wherein the mold has a cavity defined by internal walls, wherein the internal walls conform to external walls of the laryngeal mask, and wherein the mold has a core within its cavity that is adapted to form the hollow portions of the laryngeal airway. The energy stored in the leakage inductor of the transformer in a flyback converter or a forward converter is returned to the input capacitor through the energy recovery path.