https://blog.gongquiz.com/2021/11/24/pcb%ec%83%81%ec%9d%98-%eb%8f%84%ea%b8%88%ec%9c%bc%eb%a1%9c-%eb%8b%a4%ec%b8%b5%ea%b8%b0%ed%8c%90-%ec%8a%a4%eb%a3%a8%ed%99%80through-hole%ea%b5%ac%eb%a6%ac-%eb%8f%84%ea%b8%88%ec%9d%98-%ea%b2%b0/