對于smt貼片加工元(yuan)(yuan)(yuan)件(jian)引腳(jiao)較多的元(yuan)(yuan)(yuan)件(jian)，間(jian)距較寬的貼片元(yuan)(yuan)(yuan)件(jian)，也是(shi)采用(yong)(yong)類似(si)的方法(fa)，先在一個焊(han)(han)盤上鍍錫(xi)，然后左手用(yong)(yong)鑷子(zi)夾持元(yuan)(yuan)(yuan)件(jian)將一只腳(jiao)焊(han)(han)好，再用(yong)(yong)錫(xi)絲(si)焊(han)(han)其(qi)余(yu)的腳(jiao)。這類元(yuan)(yuan)(yuan)件(jian)的拆卸一般用(yong)(yong)熱(re)風(feng)較好，一手持熱(re)風(feng)將焊(han)(han)錫(xi)吹熔，另一手用(yong)(yong)鑷子(zi)等夾具趁焊(han)(han)錫(xi)熔化之際將元(yuan)(yuan)(yuan)件(jian)取下

對(dui)于(yu)引腳(jiao)密度比較高的(de)元件(jian)，在焊(han)接步驟上是(shi)類似(si)的(de)，即先焊(han)一只腳(jiao)，然后(hou)用錫絲焊(han)其余的(de)腳(jiao)。腳(jiao)的(de)數目(mu)比較多(duo)且密，引腳(jiao)與(yu)焊(han)盤(pan)的(de)對(dui)齊(qi)是(shi)關(guan)鍵。通常選在角上的(de)焊(han)盤(pan)，只鍍很少(shao)的(de)錫，用鑷子或手將元件(jian)與(yu)焊(han)盤(pan)對(dui)齊(qi)，有引腳(jiao)的(de)邊都對(dui)齊(qi)，smt電路板加工廠，稍用力將元件(jian)按在PCB板上，用烙鐵將錫焊(han)盤(pan)對(dui)應的(de)引腳(jiao)焊(han)好(hao)。

阻(zu)(zu)抗(kang)，相信大(da)多數人對阻(zu)(zu)抗(kang)知識都是(shi)略懂的(de)，smt電(dian)(dian)(dian)路板加工(gong)(gong)廠家，今天將(jiang)重點(dian)(dian)的(de)說(shuo)(shuo)明阻(zu)(zu)抗(kang)的(de)單(dan)位(wei)(wei)跟(gen)與阻(zu)(zu)抗(kang)單(dan)位(wei)(wei)相關的(de)其他符(fu)號。耳機(ji)(ji)的(de)阻(zu)(zu)抗(kang)是(shi)交流阻(zu)(zu)抗(kang)的(de)簡稱，阻(zu)(zu)抗(kang)越(yue)(yue)小，耳機(ji)(ji)越(yue)(yue)容易出(chu)(chu)(chu)聲(sheng)、越(yue)(yue)容易驅動。在臺式機(ji)(ji)或功(gong)放(fang)、VCD、DVD電(dian)(dian)(dian)視(shi)等(deng)有耳機(ji)(ji)插孔(kong)輸(shu)出(chu)(chu)(chu)的(de)機(ji)(ji)器(qi)上(shang)，一般使用中高阻(zu)(zu)抗(kang)的(de) 耳機(ji)(ji)比較適宜(yi)。如果使用低(di)阻(zu)(zu)耳機(ji)(ji)，一定先要(yao)(yao)把音(yin)量(liang)調低(di)再(zai)插上(shang)耳機(ji)(ji)，再(zai)一點(dian)(dian)點(dian)(dian)把音(yin)量(liang)調上(shang)去，防止(zhi)耳機(ji)(ji)過載將(jiang)耳機(ji)(ji)燒(shao)壞或是(shi)音(yin)圈(quan)變形錯位(wei)(wei)造(zao)成(cheng)破音(yin)。低(di)阻(zu)(zu)抗(kang)的(de)耳機(ji)(ji) 一般比較容易推(tui)動，因此隨(sui)身(shen)聽、MP3等(deng)便攜、省電(dian)(dian)(dian)的(de)機(ji)(ji)器(qi)應選擇低(di)阻(zu)(zu)抗(kang)耳機(ji)(ji)。同時還要(yao)(yao)注意靈敏(min)度要(yao)(yao)高，對隨(sui)身(shen)聽、MP3來說(shuo)(shuo)靈敏(min)度指標更加重要(yao)(yao)。當然(ran)，SMT電(dian)(dian)(dian)路板加工(gong)(gong)組裝(zhuang)，阻(zu)(zu) 抗(kang)越(yue)(yue)高的(de)耳機(ji)(ji)搭配輸(shu)出(chu)(chu)(chu)功(gong)率大(da)的(de)音(yin)源時聲(sheng)音(yin)效果更好(hao)。

SMT貼(tie)片(pian)(pian)(pian)(pian)元器(qi)件(jian)(jian)(jian)體(ti)積特別小(xiao)，重(zhong)(zhong)量(liang)輕，沈陽(yang)電(dian)(dian)路板加工，貼(tie)片(pian)(pian)(pian)(pian)元件(jian)(jian)(jian)比引線(xian)元件(jian)(jian)(jian)容(rong)易(yi)焊(han)(han)接。貼(tie)片(pian)(pian)(pian)(pian)元件(jian)(jian)(jian)還有(you)一個(ge)很重(zhong)(zhong)要(yao)的(de)(de)(de)好處，那(nei)就(jiu)是提高(gao)了電(dian)(dian)路的(de)(de)(de)穩定性(xing)和可(ke)(ke)靠性(xing)，對于制作來說就(jiu)是提高(gao)了制作的(de)(de)(de)成功率(lv)。這(zhe)是因為貼(tie)片(pian)(pian)(pian)(pian)元件(jian)(jian)(jian)沒有(you)引線(xian)，從(cong)而減少了雜散電(dian)(dian)場(chang)和雜散磁場(chang)，這(zhe)在(zai)(zai)高(gao)頻模擬電(dian)(dian)路和高(gao)速數字(zi)電(dian)(dian)路中非常明(ming)顯(xian)。SMT貼(tie)片(pian)(pian)(pian)(pian)元器(qi)件(jian)(jian)(jian)焊(han)(han)接的(de)(de)(de)方(fang)法：把元器(qi)件(jian)(jian)(jian)放在(zai)(zai)焊(han)(han)盤(pan)(pan)上，然(ran)后在(zai)(zai)元件(jian)(jian)(jian)引腳(jiao)和焊(han)(han)盤(pan)(pan)接觸處涂抹(mo)(mo)上調好的(de)(de)(de)貼(tie)片(pian)(pian)(pian)(pian)焊(han)(han)錫(xi)(xi)膏(注意涂抹(mo)(mo)的(de)(de)(de)不要(yao)太多以防短(duan)路)，然(ran)后用20W內(nei)熱式電(dian)(dian)烙(luo)鐵(tie)給焊(han)(han)盤(pan)(pan)和SMT貼(tie)片(pian)(pian)(pian)(pian)元件(jian)(jian)(jian)連接處加熱(溫度應(ying)在(zai)(zai)220~230℃)，看到(dao)焊(han)(han)錫(xi)(xi)熔化后即可(ke)(ke)拿開電(dian)(dian)烙(luo)鐵(tie)，待焊(han)(han)錫(xi)(xi)凝固后焊(han)(han)接就(jiu)完成。焊(han)(han)接完后可(ke)(ke)用鑷(nie)子夾一夾被(bei)焊(han)(han)貼(tie)片(pian)(pian)(pian)(pian)元件(jian)(jian)(jian)看有(you)無松動，無松動(應(ying)該是很結實的(de)(de)(de))即表示(shi)焊(han)(han)接良好，如有(you)松動應(ying)重(zhong)(zhong)新抹(mo)(mo)點貼(tie)片(pian)(pian)(pian)(pian)焊(han)(han)錫(xi)(xi)膏重(zhong)(zhong)新按(an)上述方(fang)法焊(han)(han)接。