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/41/1148272352.gif');}" onmousewheel="return imgzoom(this);">
3637的Pin9和Pin11欲输入反相的两正弦波,加反相器是否能实现单极性SPWM双倍频控制,谢谢!
