我是新手,請各位大俠指點(diǎn)下:
需要一個(gè)充電指示電路,當(dāng)鋰電池電壓達(dá)到4.2V,指示燈就滅掉.如何設(shè)計(jì)啊
充電指示電路
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計(jì)算431上分壓電阻 實(shí)際測試通過 
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@fhawy
計(jì)算431上分壓電阻實(shí)際測試通過[圖片]500){this.resized=true;this.width=500;this.alt='這是一張縮略圖，點(diǎn)擊可放大。\n按住CTRL，滾動(dòng)鼠標(biāo)滾輪可自由縮放';this.style.cursor='hand'}"onclick="if(!this.resized){returntrue;}else{window.open('http://u.dianyuan.com/bbs/u/78/1974501246128857.gif');}"onmousewheel="returnimgzoom(this);">
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