自制電蚊拍電路圖詳解

電蚊拍自制電路圖主要由高頻振蕩電路、三倍壓整流電路和高壓電擊網三部分組成。當按下電源開關SB時，由三極管VT和變壓器T構成的高頻振蕩器通電工作，把3V直流電變成18kHz左右的高頻交流電，經T升壓到約500V（L3兩端實測），再經二極管VD2～VD4、電容器C1～C3三倍壓整流升高到1500V左右，加到蚊拍的金屬網DW上。當蚊蠅觸及金屬網絲時，蟲體造成電網短路，即會被電流、電弧殺灼或擊暈、擊斃。電路中，發光二極管VD1和限流電阻器R1構成指示燈電路，用來指示電路通斷狀態及顯示電池電能的耗損情況。

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電蚊拍電路工作原理

電(dian)(dian)(dian)(dian)蚊(wen)拍(pai)手柄上有一個功能(neng)開關(guan)(guan)SW，SW開關(guan)(guan)共有三檔，向上推是(shi)(shi)第一檔。這(zhe)(zhe)時(shi)開關(guan)(guan)接通電(dian)(dian)(dian)(dian)池(chi)BT正極，電(dian)(dian)(dian)(dian)流通過開關(guan)(guan)經LED3、電(dian)(dian)(dian)(dian)阻R5構成(cheng)(cheng)(cheng)回(hui)路，使(shi)照明燈LED3點亮(liang)，也可在此(ci)狀態下(xia)打(da)蚊(wen)子（耗電(dian)(dian)(dian)(dian)高）；中間檔是(shi)(shi)第二檔。當(dang)將SW開關(guan)(guan)放置在中間部位時(shi)，是(shi)(shi)為了給電(dian)(dian)(dian)(dian)池(chi)BT充(chong)電(dian)(dian)(dian)(dian)。當(dang)電(dian)(dian)(dian)(dian)蚊(wen)拍(pai)電(dian)(dian)(dian)(dian)池(chi)沒電(dian)(dian)(dian)(dian)時(shi)，要將手柄下(xia)端的(de)(de)單相插頭釋放出來(lai)，插到～220V插座上，D1～D4組(zu)成(cheng)(cheng)(cheng)的(de)(de)硅整流橋給電(dian)(dian)(dian)(dian)池(chi)BT充(chong)電(dian)(dian)(dian)(dian)，LED1被點亮(liang)（充(chong)電(dian)(dian)(dian)(dian)指示）；將SW開關(guan)(guan)向下(xia)拉(la)是(shi)(shi)第三檔。這(zhe)(zhe)是(shi)(shi)準備(bei)進(jin)行滅蚊(wen)工作。當(dang)按下(xia)S1微(wei)動開關(guan)(guan)時(shi)LED2被點亮(liang)（滅蚊(wen)電(dian)(dian)(dian)(dian)路工作指示），Q1、R6、C2、R4和變壓器(qi)B的(de)(de)初級線(xian)圈組(zu)成(cheng)(cheng)(cheng)的(de)(de)振蕩電(dian)(dian)(dian)(dian)路開始工作，并在變壓器(qi)的(de)(de)次級線(xian)圈感應出電(dian)(dian)(dian)(dian)壓，經D5～D8和C3～C6組(zu)成(cheng)(cheng)(cheng)的(de)(de)倍(bei)壓整流電(dian)(dian)(dian)(dian)路，將輸(shu)出電(dian)(dian)(dian)(dian)壓迅速提升(sheng)至(zhi)1600V左右以(yi)滅殺蚊(wen)蠅(ying)（新(xin)拍(pai)應達到1800V以(yi)上）。