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1、裝配(pei)說明
2、電路原理圖
3、元件清單
4、常(chang)見問題(ti)
電(dian)(dian)(dian)路(lu)由放大(da)(da)電(dian)(dian)(dian)路(lu)和選頻網(wang)絡組成(cheng)(cheng)(cheng)。放大(da)(da)電(dian)(dian)(dian)路(lu)是由集成(cheng)(cheng)(cheng)運放所組成(cheng)(cheng)(cheng)的電(dian)(dian)(dian)壓串(chuan)聯負反饋放大(da)(da)電(dian)(dian)(dian)路(lu),取其輸(shu)入阻抗(kang)高(gao)和輸(shu)出阻抗(kang)低的特點。選頻網(wang)絡由電(dian)(dian)(dian)阻電(dian)(dian)(dian)容串(chuan)并聯組成(cheng)(cheng)(cheng),同(tong)時兼作正反饋網(wang)絡。
正弦(xian)波(bo)振蕩器(qi)的起振條(tiao)件是AF>1,從幅頻特性(xing)曲線(xian)可(ke)得,當f=f0時(shi),F=1/3,所以當A>3時(shi),即RC串并聯選頻網絡(luo)匹配一個電(dian)壓放大倍數略大于3的正反(fan)饋放大器(qi)時(shi),就(jiu)可(ke)構(gou)成正弦(xian)波(bo)振蕩器(qi)。