我呆故我DIY之TDA1541胆DAC

Saxophone

套件买来已经很长时间了，但一是苦于只有零星的时间；二是LPF一直没有一个比较好的解决方案，所以就一直没有动手装，以致在某帖子上给HQ兄戏笑。[em02]
前两个星期在一次偶然机会淘得两片天龙的CD拆机板，在HQ兄的帮助下拆出了个二中周LPF，于是用了近一周的零星时间把这份DAC完成了。现在把PP贴出来，再加以小许说明，希望对其它的兄弟有所帮助。[em11]
如果各位版主感得还行就把这东东扔到参赛区吧，让我也有机会骗骗东西。
[em09][em08][em11]

AKMY5

其实主板电容有很多是很不错的！6。3V或10V的耐压也足够了！

B

Saxophone

<img src="attachments/dvbbs/2005-8/200585161640671.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/2005-8/200585161640671.jpg\');}" onmousewheel="return imgzoom(this);" alt="" />

Saxophone

感觉空了很多。。。[em12]
<img src="attachments/dvbbs/2005-8/200585161529317.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/2005-8/200585161529317.jpg\');}" onmousewheel="return imgzoom(this);" alt="" />

Saxophone

把两只大的思碧和三只小的换了，大油筒换成你你吃康的铝皮。这东东在很BT的升技猪板上经常见到。[em11][em09]
<img src="attachments/dvbbs/2005-8/200585161443424.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/2005-8/200585161443424.jpg\');}" onmousewheel="return imgzoom(this);" alt="" />

Saxophone

在鬼版老大的指点下把铜皮重新贴了一下，也取了较短的路径回地。[em02]

<img src="attachments/dvbbs/2005-8/20058516120873.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/2005-8/20058516120873.jpg\');}" onmousewheel="return imgzoom(this);" alt="" />

赤兔

[em11]

小鬼头

目前国内论坛所贴的业余DIY的DAC布线，从照片看，大部分都。。。。。

AAAA

是为了补救线路板布线欠妥的权宜之计.此举实属无奈.[em11]

lijunwen

我以前做胆耳放时就对比过6X4与6Z4的区别，发觉6Z4比6X4厚声多了，6X4只是清晰一点但牺牲了人声的韵味！你可对比听听！

小鬼头

以下是引用Saxophone在2005-8-4 18:25:00的发言：
我就是没有看出有什么不同才问的嘛。[em00]

是不是我的铜皮就近接了地，你的没有接？？[em11]
还是你的铜皮只接数字地，不接模拟地。我的就只接了模拟地？[em12]

看那个帖子。。。。有说明的。你的铜皮提供不了高速信号所需的返回电流路径，这样仅仅只起到屏蔽作用。。。。[em02]

小鬼头

这方面的布线。重点优化信号和电源的走线布局，让电流流向更合理。尽力让环路面积最小，天线效应减低[em06][em02]

吻子

[em12]

都是BTD


















[em09]

AKMY5

鬼版，这个既然是多层板的设计，为什么不在PCB布线的时候就体现这一思路呢？双面PCB就很容易实现TDA1541的后面整片铜皮屏蔽，要是四层的PCB就更简单了！

也不用Saxophone兄和广大DIY友这么搭违章建筑啊！呵呵！

不过，对于我而言，就算用上了背面有PCB铜皮屏蔽的这样的板子，最后完工后的IC我还是要整个包铜皮的！已经尝到甜头了！带来的好处真是太多了！。。


看我包的！（图里的是一片陶瓷的54LS04）
<img src="attachments/dvbbs/2005-8/20058418547325.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/2005-8/20058418547325.jpg\');}" onmousewheel="return imgzoom(this);" alt="" />

再看背面，整个包住
<img src="attachments/dvbbs/2005-8/200584185445608.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/2005-8/200584185445608.jpg\');}" onmousewheel="return imgzoom(this);" alt="" />


接地！[em11]
分系统接，各接各的地，效果更好！不要各系统交岔就好！
<img src="attachments/dvbbs/2005-8/200584185519450.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/2005-8/200584185519450.jpg\');}" onmousewheel="return imgzoom(this);" alt="" />

Saxophone

我就是没有看出有什么不同才问的嘛。[em00]

是不是我的铜皮就近接了地，你的没有接？？[em11]
还是你的铜皮只接数字地，不接模拟地。我的就只接了模拟地？[em12]

小鬼头

以下是引用Saxophone在2005-8-4 15:59:00的发言：

你是如何贴的，愿闻其详。[em09]

http://www.hifidiy.net/dispbbs.asp?BoardID=2&id=4499&replyID=4499&star=7&skin=0

tanggt

感觉像到了化工厂，呵呵

我可搞不到这些猛料[em09]

Saxophone

以下是引用小鬼头在2005-8-4 15:38:00的发言：
估计不能收到我上次所弄铜皮的效果。。。。。。[em06]。。因为高速数字信号的回流路径没有缩短，环路面积仍比较大，天线效应仍比较强

你是如何贴的，愿闻其详。[em09]

小鬼头

以下是引用Saxophone在2005-8-4 12:28:00的发言：
<img src="attachments/dvbbs/2005-8/20058412287540.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/2005-8/20058412287540.jpg\');}" onmousewheel="return imgzoom(this);" alt="" />

估计不能收到我上次所弄铜皮的效果。。。。。。[em06]。。因为高速数字信号的回流路径没有缩短，环路面积仍比较大，天线效应仍比较强