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國創(chuàng)詳解固定衰減器的選擇

  固定衰減器是一種提供衰減的電子元器件,廣泛地應(yīng)用于電子設(shè)備中。其原理是指定的頻率范圍內(nèi),一種用以引入一預(yù)定衰減的電路。一般以所引入衰減的分貝數(shù)及其特性阻抗的歐姆數(shù)來標(biāo)明。使用固定衰減器如何選擇呢?看國創(chuàng)小編總結(jié)!

  固定衰減器的選擇主要決定于:衰減器的輸入阻抗和衰減率。

  衰減器的輸入阻抗,它決定于功放和喇叭的輸出輸入阻抗,和功放,喇叭的品牌沒有關(guān)系。一般喇叭的輸入阻抗都會是4歐姆8歐姆16歐姆其中的一種,而功放都會提供上述一個或幾個阻抗的輸出。相應(yīng)的衰減器阻抗也分為:4歐姆,8歐姆,16歐姆。衰減器輸入阻抗最好和功放輸出阻抗匹配,喇叭的輸入阻抗一定要和衰減器的阻抗一致,也就是說:4歐的功放輸出,配4歐的衰減器,再接4歐的喇叭。如果你想接其它阻抗功放,一定要保證衰減器的阻抗大于或等于功放輸出阻抗,比如,4歐的功放可以接到8歐的衰減器上。但反過來,就不允許。

  衰減器的衰減率,問題就較復(fù)雜一些,功放的電功率直接決定其聲功率,但兩者又不是一一對應(yīng)關(guān)系,人耳在不同音量時對聲音的敏感度不同。太高,太低,敏感度都會下降。這就決定了不同功率范圍的功放,衰減率應(yīng)該不同,50瓦以下的功放,衰減-12db,就能使大部分音量處于最敏感區(qū)域。再進(jìn)一步衰減,成本高,聲音衰減過大,人耳不敏感,又要增加補(bǔ)償。

  所以,選擇衰減器的衰減率,就要根據(jù)你的功放功率范圍,最好選功率接近,不要用大功率衰減器配小功率功放,不劃算。同樣小功率衰減器配大功放,衰減程度就會不夠。

  上述就是國創(chuàng)講解的自己的固定衰減器的選擇,希望看完能夠?qū)δ兴鶐椭?,如果您想要了解更多關(guān)于固定衰減器的相關(guān)信息的話,歡迎在線咨詢我們國創(chuàng)客服或是撥打服務(wù)熱線029-85251919進(jìn)行咨詢,我們將竭誠為您提供優(yōu)質(zhì)的服務(wù)!
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