哈哈，钳版，我的1541也到了

文招

我是直接焊TDA1541A的6和25脚的，已经断开电感电容了[em11][em11][em11]
<img src="attachments/dvbbs/2004-12/200412620257174.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/2004-12/200412620257174.jpg\');}" onmousewheel="return imgzoom(this);" alt="" />
好像这个LPF的转换频率是48KHZ。我想说明的是，这个TDA1541DAC的噪声就是模拟输出级引起的[em11][em11][em11]

文招

以下是引用yekut在2004-12-6 16:02:00的发言：
看我用什么毒你<I></I> ！！！！
<img src="attachments/dvbbs/2004-12/200412616151427.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/2004-12/200412616151427.jpg\');}" onmousewheel="return imgzoom(this);" alt="" />

我不喜欢。俾套HIFI颂高兴啦[em11][em11][em11]

小鬼头

以下是引用文招在2004-12-6 14:54:00的发言：
用最简的单运放组成的LPF取代，噪声全无

想知道，你还使用DAC板上那些电感电容（即仍接DAC板上的LPF）吗？只是撤掉电子管部分，换用运放作“放大”？

以下是引用文招在2004-12-6 14:54:00的发言：
看来想追求电子管的音色，有得搞了[em10][em10][em10]

你用的这块运放板，估计大多是配合超取样方式使用的，换言之，这个LPF的转换频率相当高（应该有50KHZ以上，具体忘了[em10]），而这里的DAC是NOS（非超取样方式），这样一来，频谱上平移到44。1KHZ的的量化噪声基本没衰减。。。。。也就是说，基本上，在解决噪声之余。。。。等于用运放（的声音）取代电子管（的声音）！[em07]。。。。死未？呵呵[em11][em11]

我曾与AEON版主做试验，这个NOS TDA1541 DAC连滤波器（LPF）也不用，声音已不错，但与使用LC做成的LPF作比较，显得高频有毛躁感（用耳机听特别明显，音箱就没有那么明显，哈[em02]），用一个小电容并联I/V电阻到地（实际上是一阶的简单LPF），能减小一些毛躁感。。。呵呵。[em05]

yekut

看我用什么毒你 ！！！！
<img src="attachments/dvbbs/2004-12/200412616151427.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/2004-12/200412616151427.jpg\');}" onmousewheel="return imgzoom(this);" alt="" />

小钳子

文招

[em11][em11][em11]<img src="attachments/dvbbs/2004-12/200412615536115.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/2004-12/200412615536115.jpg\');}" onmousewheel="return imgzoom(this);" alt="" />

文招

建议用最简的，刚刚试了一会声音，颇平衡的。当然没有老大所谓的质感了[em11][em11][em11]

文招

<img src="attachments/dvbbs/2004-12/2004126145549495.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/2004-12/2004126145549495.jpg\');}" onmousewheel="return imgzoom(this);" alt="" />
其中仅用了运放部分

小钳子

到时候我们也搞个扩充的运放PCB


扁,你Y地光丢炸弹不出结果!

文招

用最简的单运放组成的LPF取代，噪声全无，看来想追求电子管的音色，有得搞了[em10][em10][em10]

文招

<img src="attachments/dvbbs/2004-12/20041261449482.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/2004-12/20041261449482.jpg\');}" onmousewheel="return imgzoom(this);" alt="" />[em05]

文招

[em11]

小钳子

文招

[em10][em10][em10]

文招

[em10][em10][em10]

小钳子

文招

[em11][em11][em11]

文招

[em11][em11][em11]

小钳子

现在明了吧

[em11][em11]

文招

我不明[em11][em11][em11]