That night, Elara didn't go home. She opened Proteus 8 Professional and stared at the empty schematic pane. She had two choices: model the circuit using discrete ideal transformers (which ignored the ZMPT’s non-linearity and phase shift) or build the library herself.
"No," Elara smiled, rubbing her eyes. "We saved three more blown op-amps."
She saved the library file, wrote a quick .IDX index file, and placed it in the LIBRARY folder of Proteus.