自己买元件太不划算了,还是买套件划算。<br /><br />原理图: <br /> 相关链接:<a href='http://bbs.21ic.com/club/bbs/list.asp?boardid=67&page=1&t=3270004&tp=%5B%u65B0%5D%5B%u6CE8%u610F%5D%u968F%u4E66%u5149%u76D8PCB%u5BF9%u5E94%u7684%u539F%u7406%u56FE'>http://bbs.21ic.com/club/bbs/list.asp?boardid=67&page=1&t=3270004&tp=%5B%u65B0%5D%5B%u6CE8%u610F%5D%u968F%u4E66%u5149%u76D8PCB%u5BF9%u5E94%u7684%u539F%u7406%u56FE</a>
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