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[求助]
以下是引用charlle在2005-11-8 10:46:00的发言:
并联+桥接的电路真的好难做好,小弟我这半年没有少在这方面花功夫,做好了的确在扩展功率,控制力等方面都很出色,但要做好真的好难好难,特别是各个通道的动态整合,在不同输出电压摆幅下,各IC的输出相差好大,通道间还有相差,在外部元件0.1%筛选的情况下,小弟的试验中,输出摆幅为+-10V时,通道间压差最大达到800mV,相差达1uS(10Khz),以小弟个人的试验来看,BPa要想获得好声,通道间的动态压差最低要求应在1%以内,相差应在100ns以内才行,否则高音一定发暗发毛。因而IC的挑选和外部元件的精调要求都很高,加上并联以后容易自激等问题。个人感觉,并联不难,并出好声难!下面的图是小弟试验的一部分,有自做的板,也有购来的套件,还有用来配套的ic。坛子里的套件也用过十几套,就不上图了。个人愚见,供各位想搞BPa的同好参考。
<img src="attachments/dvbbs/2005-11/200511810532537.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/2005-11/200511810532537.jpg\');}" onmousewheel="return imgzoom(this);" alt="" />
<img src="attachments/dvbbs/2005-11/200511810557626.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/2005-11/200511810557626.jpg\');}" onmousewheel="return imgzoom(this);" alt="" />
<img src="attachments/dvbbs/2005-11/200511810627856.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/2005-11/200511810627856.jpg\');}" onmousewheel="return imgzoom(this);" alt="" />
剩下的一些DD(1876、3886)
<img src="attachments/dvbbs/2005-11/200511810657641.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/2005-11/200511810657641.jpg\');}" onmousewheel="return imgzoom(this);" alt="" />
大哥能买几块你这种封装的LM3886给我吗!?[em09] |
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