A06B-0332-B575#7075

當(dāng)環(huán)境溫度上升達到設(shè)定值時，比較器翻轉(zhuǎn)輸出低電平，三極管Q1截止，繼電器釋放，J1-1斷開，停止加熱。同時指示燈D4被點亮。

整個電路的電源取自市電220V交流電，經(jīng)電容C1降壓后，再經(jīng)二極管整流，電容C3濾波，78L05穩(wěn)壓輸出5V，給LM358和溫度傳感器供電。

電阻R1在電路斷電后，給電容C1提供泄放回路。二極管D2是在市電負半周時，給電容C1提供放電回路，放電回路是C1——電源——二極管D2——電容C1。

A06B-0332-B575#7075 

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