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/72/1384071229506386.gif');}" onmousewheel="return imgzoom(this);">怪怪的问题,二极管发热,大家发表一下意见!
就这个反馈电路,空载的时候SR260发热,一会就烧了,接上一串8个1W的LED,只有小小温度,想来想去都不明白为什么?高手请解说一下!IC是用tny268,电解是50V220UF500) {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/72/1384071229506386.gif');}" onmousewheel="return imgzoom(this);">
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