回复LST的问题！
<img src="attachments/dvbbs/2005-10/200510111275072608.jpg" border="0" onload="if(this.width>screen.width*0.7) {this.resized=true; this.width=screen.width*0.7; this.alt=\'Click here to open new window\nCTRL+Mouse wheel to zoom in/out\';}" onmouseover="if(this.width>screen.width*0.7) {this.resized=true; this.width=screen.width*0.7; this.style.cursor=\'hand\'; this.alt=\'Click here to open new window\nCTRL+Mouse wheel to zoom in/out\';}" onclick="if(!this.resized) {return true;} else {window.open(\'attachments/dvbbs/2005-10/200510111275072608.jpg\');}" onmousewheel="return imgzoom(this);" alt="" /><BR>NE555延迟保护电路！ <P>刚看了一下，270欧姆电阻应该是270K欧姆！电路你能做多小就做多小！微型继电器不好找！你也可以使用单向可控硅代替，mn21工作电流5A,最好多个并联！这电路很简单，对于mn21这样娇气的灯泡还是很有实用价值的！</P>
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