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【正文】 外線自動(dòng)洗手器主要由LM56NE55780紅外線發(fā)射管與接收電路、固態(tài)繼電器以及電磁閥組成，其控制電路[1]如下：圖1 紅外線自動(dòng)洗手器控制電路fig1 the control circuit of infrared automatic washing device本電路利用220V市電供電，市電經(jīng)變壓器T作用之后轉(zhuǎn)換為9V交流電壓，再通過(guò)整流橋的作用轉(zhuǎn)變?yōu)樯孕∮?V的直流電壓，經(jīng)R1限流之后驅(qū)動(dòng)D1發(fā)紅光，作為電源指示燈。關(guān)鍵詞：紅外線自動(dòng)洗手器；整流穩(wěn)壓電路；控制電路；延時(shí)電路The principle of infrared automaticwashing device Abstract: Infrared automatic washing device controls the running of faucet valve by responding to infrared radiation, when somebody’s hand approaching, the infrared signal which is emitted by infrared radiation emitting diode will be reflected by hand and then infrared receiver circuit will receive it, response will be produced by the control circuit which is consisted of LM567 and NE555, which can make the faucet valve open auto
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