Inspire have redesigned the classic demonstration apparatus to address the safety issues in the conventional apparatus. The conventional design always had the chance to generate lethal voltage if a wrong primary -secondary combination of coils were used. Using the purpose-designed power supply, no voltage greater than 25V ac can be experienced in whatever cobination of primary – secondary coils the user selects. Also, the wings of the specially designed coils prevent any wrong combination to generate high secondary voltage. The 25 V ac output terminal of the power supply cannot be connected across the ordinary coils to make step-up or step-down trnasformer and hence safe. Only specially designed coils with special connectors joins to the 25V ac terminal.