大家對于電(dian)源適配器并不陌生，但是要(yao)(yao)說真正了解(jie)電源適配器的恐怕是少數，想(xiang)要(yao)(yao)了解(jie)電源適配器，首先要(yao)(yao)從看懂參數開始。

　舉例：電(dian)(dian)(dian)源適(shi)配器(qi)的參數12V1.25A——表示(shi)電(dian)(dian)(dian)壓輸出(chu)12V，最大(da)(da)輸出(chu)電(dian)(dian)(dian)流(liu)1.25A(并不是指(zhi)實際使用(yong)電(dian)(dian)(dian)流(liu))，功率等(deng)于電(dian)(dian)(dian)壓乘電(dian)(dian)(dian)流(liu)，最大(da)(da)功率是15W。實際使用(yong)中電(dian)(dian)(dian)源的輸出(chu)電(dian)(dian)(dian)流(liu)是根據用(yong)電(dian)(dian)(dian)設備而(er)不同。電(dian)(dian)(dian)源是否合適(shi)用(yong)，首要看電(dian)(dian)(dian)源電(dian)(dian)(dian)壓，其次(ci)最大(da)(da)電(dian)(dian)(dian)流(liu)要足夠大(da)(da)。

　比如我們常用的BBS無線(xian)麥克風電(dian)(dian)源是(shi)(shi)12V1.25A，一般(ban)來講，電(dian)(dian)壓(ya)可(ke)以有(you)少(shao)許誤差，10V到(dao)15V都可(ke)以使用——電(dian)(dian)路(lu)主(zhu)板上都會(hui)有(you)穩壓(ya)電(dian)(dian)路(lu)，而這個(ge)穩壓(ya)電(dian)(dian)路(lu)是(shi)(shi)允許在一定的電(dian)(dian)壓(ya)范圍工作(zuo)。但是(shi)(shi)電(dian)(dian)源的最(zui)大輸(shu)出(chu)電(dian)(dian)流最(zui)好達(da)到(dao)我們設備的額定耗電(dian)(dian)電(dian)(dian)流的三倍以上。

　電(dian)(dian)(dian)源(yuan)(yuan)的好壞對于音頻信(xin)號放大輸(shu)出有(you)很大影(ying)響。在(zai)滿足電(dian)(dian)(dian)壓輸(shu)出大小的情況下(xia)，如果電(dian)(dian)(dian)流過小，在(zai)進行大動態信(xin)號的放大時(shi)，可能會(hui)(hui)導(dao)致電(dian)(dian)(dian)源(yuan)(yuan)電(dian)(dian)(dian)壓被拉低(甚至(zhi)會(hui)(hui)導(dao)致電(dian)(dian)(dian)源(yuan)(yuan)變壓器斷(duan)電(dian)(dian)(dian)保護)，然(ran)后聲(sheng)音信(xin)號輸(shu)出失真破(po)音(尤其是高音)，嚴重的會(hui)(hui)導(dao)致后級設備燒毀。

另外電(dian)(dian)源(yuan)(yuan)(yuan)對(dui)音色(se)也會(hui)有影響，比如使用(yong)(yong)線性電(dian)(dian)源(yuan)(yuan)(yuan)(變壓器(qi)(qi)直接將220V變到低壓)和使用(yong)(yong)開關電(dian)(dian)源(yuan)(yuan)(yuan)呈現(xian)出(chu)來的(de)聲(sheng)音在(zai)力度和聲(sheng)音細膩度上會(hui)有差(cha)異。所以一旦原(yuan)(yuan)裝的(de)電(dian)(dian)源(yuan)(yuan)(yuan)變壓器(qi)(qi)損壞(huai)，臨時可以用(yong)(yong)其他同規格變壓器(qi)(qi)頂上，但是如果(guo)要(yao)還原(yuan)(yuan)設備原(yuan)(yuan)來的(de)聲(sheng)音特性，還是要(yao)換回原(yuan)(yuan)裝的(de)電(dian)(dian)源(yuan)(yuan)(yuan)適配(pei)器(qi)(qi)。