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)(dian)蚊(wen)(wen)(wen)拍手(shou)柄(bing)上(shang)有一個功能開(kai)關SW，SW開(kai)關共有三檔(dang)(dang)，向上(shang)推是(shi)(shi)第一檔(dang)(dang)。這時(shi)開(kai)關接通電(dian)(dian)(dian)(dian)(dian)池BT正極，電(dian)(dian)(dian)(dian)(dian)流通過開(kai)關經(jing)LED3、電(dian)(dian)(dian)(dian)(dian)阻R5構成(cheng)回路，使(shi)照明燈LED3點(dian)亮，也可在此狀態下(xia)打蚊(wen)(wen)(wen)子（耗電(dian)(dian)(dian)(dian)(dian)高）；中(zhong)間檔(dang)(dang)是(shi)(shi)第二檔(dang)(dang)。當將(jiang)SW開(kai)關放(fang)置(zhi)在中(zhong)間部(bu)位時(shi)，是(shi)(shi)為了給電(dian)(dian)(dian)(dian)(dian)池BT充(chong)電(dian)(dian)(dian)(dian)(dian)。當電(dian)(dian)(dian)(dian)(dian)蚊(wen)(wen)(wen)拍電(dian)(dian)(dian)(dian)(dian)池沒電(dian)(dian)(dian)(dian)(dian)時(shi)，要將(jiang)手(shou)柄(bing)下(xia)端的(de)(de)單相插(cha)頭釋放(fang)出(chu)來，插(cha)到～220V插(cha)座(zuo)上(shang)，D1～D4組成(cheng)的(de)(de)硅整(zheng)流橋給電(dian)(dian)(dian)(dian)(dian)池BT充(chong)電(dian)(dian)(dian)(dian)(dian)，LED1被(bei)(bei)點(dian)亮（充(chong)電(dian)(dian)(dian)(dian)(dian)指示）；將(jiang)SW開(kai)關向下(xia)拉是(shi)(shi)第三檔(dang)(dang)。這是(shi)(shi)準(zhun)備進行滅蚊(wen)(wen)(wen)工作(zuo)。當按下(xia)S1微動開(kai)關時(shi)LED2被(bei)(bei)點(dian)亮（滅蚊(wen)(wen)(wen)電(dian)(dian)(dian)(dian)(dian)路工作(zuo)指示），Q1、R6、C2、R4和(he)變壓(ya)器B的(de)(de)初級線圈(quan)組成(cheng)的(de)(de)振蕩電(dian)(dian)(dian)(dian)(dian)路開(kai)始工作(zuo)，并在變壓(ya)器的(de)(de)次級線圈(quan)感應(ying)出(chu)電(dian)(dian)(dian)(dian)(dian)壓(ya)，經(jing)D5～D8和(he)C3～C6組成(cheng)的(de)(de)倍壓(ya)整(zheng)流電(dian)(dian)(dian)(dian)(dian)路，將(jiang)輸出(chu)電(dian)(dian)(dian)(dian)(dian)壓(ya)迅(xun)速提升至(zhi)1600V左右以(yi)滅殺(sha)蚊(wen)(wen)(wen)蠅（新拍應(ying)達到1800V以(yi)上(shang)）。