該遙控開關(guān)的特點(diǎn)是不需專用遙控手機(jī),可用家中現(xiàn)成的彩電遙控器進(jìn)行遙控操作,能非常方便地對(duì)家用電器實(shí)行開、關(guān)控制,遙控距離可達(dá)六、七米。電路原理如圖所示。
????圖中IC1為彩電遙控接收頭,①腳為地,②腳為+5V電源端,③腳為信號(hào)輸出端,未接收到信號(hào)時(shí)為+3.6V左右,接收到信號(hào)時(shí)為0V左右,IC2為CD4017十進(jìn)制計(jì)數(shù)/譯碼集成電路。
????交流220V電源經(jīng)降壓、整流和濾波后得到的直流12V電壓作為繼電器的工作電壓,+12V再經(jīng)R2限流,VD穩(wěn)壓后得+5V為電路其他部分供電。靜態(tài)時(shí),T1導(dǎo)通,IC2的狀態(tài)為Q0=1,并保持不變,指示燈LED點(diǎn)亮。當(dāng)按一下遙控器上的任一鍵時(shí),IC1的③腳輸出一串低電平脈沖,經(jīng)C4平滑后,T1由導(dǎo)通變?yōu)榻刂?,IC2的{14}腳輸入一正脈沖,Q0=0,Q1=1,T2導(dǎo)通,J吸合,被控制的家用電器得電工作。再按一次遙控器時(shí),Q1=0、Q2=1,由于Q2端接IC2{15}腳,使IC2復(fù)位,Q0=1,因此J失電,被控制的電器斷電。
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