求教lm358构成的滞回比较器??
lm358构成滞回比较器!我想问一下,回差电压是不是跟R1和R3都有关系,还是只与R3有关,或者与三个电阻都有关?其二,为什么V-和V+的压差为1V就翻转,不是过零翻转吗?附图如下: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/20/1092075796.jpg?x-oss-process=image/watermark,g_center,image_YXJ0aWNsZS9wdWJsaWMvd2F0ZXJtYXJrLnBuZz94LW9zcy1wcm9jZXNzPWltYWdlL3Jlc2l6ZSxQXzQwCg,t_20');}" onmousewheel="return imgzoom(this);">