[問題] 聲控開關問題
最近要做專題，上網找到這個電路圖是別人以前實作過的
http://i.imgur.com/rNha9Rg.jpg
左下是使用二級放大和２個NE555跟4017
比較不懂的地方是左上的電路功用是什麼？看他們接出來的麵包板上好像也接到這塊
謝謝大家。
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