Isolation transformers are designed with consideration to capacitive coupling between The 2 windings. The capacitance among Main and secondary windings would also few AC present from the primary into the secondary. A grounded Faraday shield involving the principal as well as the secondary enormously decreases the coupling of popular-method sounds. https://manuelvrlfb.blogdanica.com/28597856/not-known-factual-statements-about-vibration-isolator