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   裝配說明：

   集成電路U1是一片555定時電路，在這里接成單穩態電路。平時由于觸摸片P端無感應電壓，電容C1通過555第7腳放電完畢，第3腳輸出為低電平，繼電器KS釋放，電燈不亮。

當需要(yao)開燈(deng)(deng)時，用手觸碰一下金屬片P，人體感應的(de)雜波信號(hao)電(dian)(dian)壓(ya)由C2加至555的(de)觸發端，使(shi)555的(de)輸出由低(di)變(bian)成高電(dian)(dian)平(ping)，繼電(dian)(dian)器KM吸合，電(dian)(dian)燈(deng)(deng)點亮。同時，555第(di)(di)7腳內部截止，電(dian)(dian)源(yuan)便通(tong)過R1給C1充電(dian)(dian)，這就是定時的(de)開始。當電(dian)(dian)容C1上電(dian)(dian)壓(ya)上升至電(dian)(dian)源(yuan)電(dian)(dian)壓(ya)的(de)2/3時，555第(di)(di)7腳道通(tong)使(shi)C1放電(dian)(dian)，使(shi)第(di)(di)3腳輸出由高電(dian)(dian)平(ping)變(bian)回到(dao)低(di)電(dian)(dian)平(ping)，繼電(dian)(dian)器釋放，電(dian)(dian)燈(deng)(deng)熄滅，定時結束。

定(ding)(ding)時長短由RP1、R2、C1決定(ding)(ding)：T1=1.1(Rp1+R2)*C1。D1可選(xuan)用1N4148或(huo)1N4001。

   拿到套件(jian)以后(hou)，請對(dui)照(zhao)元(yuan)(yuan)(yuan)(yuan)器(qi)件(jian)清單仔細核對(dui)，并用(yong)(yong)萬用(yong)(yong)表粗略測量(liang)各元(yuan)(yuan)(yuan)(yuan)器(qi)件(jian)的(de)參數，檢(jian)查(cha)元(yuan)(yuan)(yuan)(yuan)器(qi)件(jian)是否有誤。然(ran)后(hou)對(dui)照(zhao)裝(zhuang)配(pei)圖焊(han)接元(yuan)(yuan)(yuan)(yuan)器(qi)件(jian)，檢(jian)查(cha)有無虛焊(han)、

錯焊、漏焊，檢查無誤后(hou)上電調試