AliExpressのトロイダルフェライトコアの商品動画が全然関係なくて笑う

1PCS OD 31-102mm ID 19-65mm H 13-20mm Mn-Zn Ferrite Ring Core High-frequency Large Transformer EMI Filter Ferrite Ring Isolator
https://www.aliexpress.com/item/1842630243.html
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