<p><font face="Verdana">过零触发
电路</font><br/></p>
<p><img style="WIDTH: 527px; HEIGHT: 365px" height="350" alt="" src="https://www.elecfans.com/ar
ticle/UploadPic/2006-4/2006415232410691.gif" <p/><br/><font face="Verdana">过零脉冲电路有用到TLP621
芯片。</font></p>
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