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交流放大電路的主要目的是對交流訊號進行放大,而加在基集的直流電源會對其產生影響.因而,你會發現在交流放大電路中比一般(直流放大電路)電路多了兩個電容 而電容的基本特點就是通直流阻交流,這樣交流輸入端的電容則保證了交流輸出.輸出端的直流訊號被阻斷,輸出的電壓就只有交流訊號了 此外,對於電流而言,值為零就相當於開路,對於電壓而言,值為零就相當於短路. 因而,由於電容的作用使交流放大電路中的直流電源相當於短路
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