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<div class="quote"><b>以下是引用<i>铁头烧友</i>在2007-3-22 15:45:00的发言:</b><br/><p align="center"><img src="attachments/dvbbs/2007-3/200732215403747681.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/2007-3/200732215403747681.jpg\');}" onmousewheel="return imgzoom(this);" alt="" /></p><p align="center"><font size="3"> MC的FB1原设计的喇叭组合为VIFA M17WG-09-08+D25AG-05-06,分频数据为括号内的;</font></p><p align="center"><font size="3">后人觉得D25AG-05-06喇叭单元不理想,改用D25AG-35-06,数据做了调整,为括号外的。<br/></font></p></div><p>
一直想找回10年前的感觉
</p><p>铁头烧友,我认为杂志上登的分频器图有问题。 </p><p>我在网上找到一个实际的FB1分频器,它的高频滤波电容却是3.0uF。请看附图。</p><p>现在我们知道分频点频率为3000Hz,高频滤波电感为0.9mH,来反推一下高频滤波电容的值到底是多少:</p><p>根据2阶高通分频器的计算公式:C=1/(2*<font face="宋体">√2*<span lang="EN-US" style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-bidi-font-size: 12.0pt; mso-font-kerning: 1.0pt; mso-bidi-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA;">∏*f*R) ,L=(<font face="宋体">√2*R)/(2*<span lang="EN-US" style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-bidi-font-size: 12.0pt; mso-font-kerning: 1.0pt; mso-bidi-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA;">∏*f</span>),</font></span></font></p><p><font face="宋体"><span lang="EN-US" style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-bidi-font-size: 12.0pt; mso-font-kerning: 1.0pt; mso-bidi-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA;">可以得到C=1/(2*L*2*<span lang="EN-US" style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-bidi-font-size: 12.0pt; mso-font-kerning: 1.0pt; mso-bidi-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA;">∏*f*<span lang="EN-US" style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-bidi-font-size: 12.0pt; mso-font-kerning: 1.0pt; mso-bidi-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA;">∏*f)=1/(2*0.0009*2*3.14*3000*3.14*3000)=3.13e-6F,即约3uF。</span></span></span></font></p><p></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt;"><span lang="EN-US" style="FONT-FAMILY: 宋体;"></span></p>因此可以判断,杂志上肯定搞反了,或许是笔者不小心,也或者是其故意为之。所以说杂志有时也害人,根据上面去做,反而是做错了。<p></p>
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