求簡(jiǎn)單的PWM調(diào)光電路.非常感謝!
5V輸入的PWM調(diào)光電路,要求不高,頻率1K以上都可以,實(shí)現(xiàn)用電位器調(diào)節(jié)占空比.非常感謝!!
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R2用來(lái)調(diào)整duty,如果R5用1k可以在2%到98%調(diào)整,但最好按圖中的值來(lái)獲得最好的亮度.Q1與Q2組合成達(dá)林頓管,用以減少對(duì)U1的電流獲取與提高放倍數(shù),并U1最好用CMOS型的,這樣電壓低到2V時(shí)還能工作.L1與D1升壓后給LED供電,C2決定頻率,改變R2不會(huì)改變頻率.
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R2用來(lái)調(diào)整duty,如果R5用1k可以在2%到98%調(diào)整,但最好按圖中的值來(lái)獲得最好的亮度.Q1與Q2組合成達(dá)林頓管,用以減少對(duì)U1的電流獲取與提高放倍數(shù),并U1最好用CMOS型的,這樣電壓低到2V時(shí)還能工作.L1與D1升壓后給LED供電,C2決定頻率,改變R2不會(huì)改變頻率.[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/71/321341226379728.gif');}"onmousewheel="returnimgzoom(this);">[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/71/321341226379734.gif');}"onmousewheel="returnimgzoom(this);">[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/71/321341226379742.gif');}"onmousewheel="returnimgzoom(this);">
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