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500) {this.resized=true; this.width=500; this.alt='这是一张缩略图，点击可放大。\n按住CTRL，滚动鼠标滚轮可自由缩放';this.style.cursor='hand'}" onclick="if(!this.resized) {return true;} else {window.open('http://u.dianyuan.com/bbs/u/61/2345111200991381.gif');}" onmousewheel="return imgzoom(this);">
2.
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3.
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第一種電路 缺點就是ripple比較大
優點就是每個電容耐壓可以比較小
第二種電路 缺點就是每個電容耐壓都必須越來越大
優點就是ripple比較小
第三種電路 缺點就是元件較多複雜
優點就是電容耐壓小 ripple小
