数字输出板装机说明.
数字输出板装机报告论坛本次的数字输出板是以“W****”的数字输出部分作为参考的。
由于种种原因没有能够提供线路图,请大家谅解。幸好原理比较简单,可以做大致的分析说明:此板的信号输入接口为右下角标有“D GND”“D IN”的部分,用以接收从CD/LD/DVD等信号源的DSP芯片的数字输出脚(DO)输出的数字信号,经过型号为DS26LS31CN的IC的整形放大,再分配到光纤输出(OPTICALOUT),同轴输出(COAXIALOUT)和数字平衡输出(AES/EBUOUT)。由于大部分的中低价解码器不具备数字平衡输入以及接插件的原因,本板发送的套件不包含数字平衡输出部分的元器件,有条件的朋友可以自己增加数字平衡输出。电源部分比较简单:AC9V电源经过整流滤波后用7805三端稳压IC获得5V的直流电压。
元器件的安装:按照一般经验,先焊接电阻电容和整流稳压部分和接插件,最后拔下电烙铁的电源,用余热来焊接DS26LS31CN这个IC。焊接完毕后建议再检查一遍焊接面,刮去多余的松香和焊锡,防止短路和虚焊等情况出现。有条件的用酒精洗去松香的话,线路板会更美观。
检查无误以后就可以接入次级为AC9V的变压器,通电测量7805的3脚的电压为5V。下一步就可以从CD机的DSP芯片的DO脚和地线上引出数字信号至数字板的输入,然后连接解码器和功放音箱试音了。
下图是我安装的板子,部分元器件与套件的有所不同:滤波电容用了2200UF/16V的,同轴输出部分采用了BNC头。
最后附一个部分常用DSP芯片的DO脚的表格,希望对大家有用。
SONY CXD1125 27
SONY CXD1135 27
SONY CXD1167Q/QZ 27
SONY CXD2500Q/AQ/BQ 60
SONY CXD2507AQ 39
SONY CXD2508AR 59
SONY CXD2508AQ 61
SONY CXD2515Q 71
SONY CXD2518Q 61
SANYO LC7861 43
SANYO LC7861NE/7861K 43
SANYO LC7867 43
SANYO LC7868 43
SANYO LC78681 43
SAMSUNG KS5990/5991 27
SAMSUNG KS9210/9211B 27
YAMAHA YM7121B 23
PANASONIC MN6626 23
PHILIPS SAA7345 2
SAA7341 32
SAA7220 14
TOSHIBA TC9236AF 75
MITSUBISHIM50423FP 4
<img src="attachments/dvbbs/2005-2/2005214141027886.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/2005-2/2005214141027886.jpg\');}" onmousewheel="return imgzoom(this);" alt="" />
好贴!
好贴!收藏!论坛的数字板和下面图的线路哪个好啊?
真搞不清啊
用在平衡输出倒是不错
CS8412内部有一个RS422 RECEIVER, 用DS26LS31CN做平衡输出, 和CS8412配合,应该效果不错. 单是用DS26LS31CN做RCA输出, 我感觉相对74HC04没有优势.奇怪
如果DS26LS31CN就做RCA数码输出用, 还不如用74HC04的2个GATE呢, 看了一下DATASHEET, 74HC04好像速度比DS26LS31CN快.....谁给讲讲?
淘王,那怀念23是你的吧
这个输出还不算尽人意。…………
<img src="attachments/dvbbs/2005-2/2005216112453614.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/2005-2/2005216112453614.jpg\');}" onmousewheel="return imgzoom(this);" alt="" />..
<img src="attachments/dvbbs/2005-2/2005216115331.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/2005-2/2005216115331.jpg\');}" onmousewheel="return imgzoom(this);" alt="" /><img src="attachments/dvbbs/2005-2/200521611559817.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/2005-2/200521611559817.jpg\');}" onmousewheel="return imgzoom(this);" alt="" /><img src="attachments/dvbbs/2005-2/200521611616397.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/2005-2/200521611616397.jpg\');}" onmousewheel="return imgzoom(this);" alt="" />Wadia 23
<img src="attachments/dvbbs/2005-2/200521611417292.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/2005-2/200521611417292.jpg\');}" onmousewheel="return imgzoom(this);" alt="" />怀念的也爽啊,至少不是仿国货
怀念有台CD拿先鋒的S901改下数码输出就卖几倍的价,说明它的数字板还不錯的是仿WADIA输出板不是KRELL
好东西
"从CD/LD/DVD等信号源的DSP芯片的数字输出脚(DO)输出的数字信号"是并联吧? 挑开了废掉原机的武功可以么?
用12V AC 更好
晕。数字板的电流并不大。
没有什么热度的12.7V并不会烧毁7805的,最多会较热
??
AC9V整流后得12.7V直流,加到7805上,压降太大,可能烧毁啊加精!
wzy728版主,数字输出板电路图已有。
http://www.hifidiy.net/UploadFile/2005-1/2005123121833989.gif
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