减少也好,调哪些元件?
12V有也几个mV的150Hz的纹波
12V接稳压二极管串连电阻和光耦反馈稳压;210V不稳压.
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/73/373551233397490.gif');}" onmousewheel="return imgzoom(this);">