This is an induction demonstrator I made using a wireless power supply module purchased inexpensively from Aliexpess. The demonstrator is made to hook up to a DC power supply.

https://www.aliexpress.us/item/2255801038897414.html?spm=a2g0o.order_list.order_list_main.29.21ef1802xxAP5S&gatewayAdapt=glo2usa