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Proof of Concept - A breadboard was constructed, of readily available parts, according to the TinyCad schematic:
Construction - The two transformers are wound on toroidal cores. A photograph:
Function Test - Power was passed, between the ports, in both directions, while monitoring waveforms on an oscilloscope. Everything worked as intended.
Conclusions - The concept is valid. Construction of more refined models, and efficiency measurements on them, is warranted.