一個(gè)有趣的問(wèn)題
一根線控制2個(gè)燈,線接地A燈亮,線接12V B燈亮,線懸空則全不亮,請(qǐng)問(wèn)用什么電路實(shí)現(xiàn)?
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用兩個(gè)運(yùn)放作成電壓比較器.
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@xsfrzeg
用兩個(gè)運(yùn)放作成電壓比較器.[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/51/1174649823.jpg');}"onmousewheel="returnimgzoom(this);">
這位兄弟是個(gè)高手,請(qǐng)問(wèn)比較器能驅(qū)動(dòng)燈亮嗎?
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