自制可调变压器

将电阻焊道三极管上

三极管旁焊接红线

在可调电阻上焊接黑线

红线连可调电容

连接

详情请看这个视频

购买网址三极管lm317:https://item.jd.com/29799762724.html 散热片https://item.jd.com/30013060963.html 12V直流电池https://item.jd.com/30455271932.html?jd_pop=ba96677a-1f46-45a8-a2d7-120558af63a0&abt=0 电池扣https://item.jd.com/16573918195.html 电压表https://item.jd.com/29606241470.html 电阻（褐色红色褐色银色）https://item.jd.com/25183438118.html 可调电阻https://item.jd.com/1751258822.html