回鬼版
我是直接焊TDA1541A的6和25脚的,已经断开电感电容了<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
呵呵
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
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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
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),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)!。。。。死未?呵呵
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),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。
哈哈!!!!
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="" />
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用S1毒我?也回敬几个重磅炸弹
<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="" />搞运放LPF的话
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。
<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
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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!http://www.hifidiy.net/face/face130.gif
我把电子管拨下后
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,有得搞了加新的LPF后噪声全无
<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="" />即将有新结果
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来日我也印七八个皇冠上去气威下
来日我印七八个皇冠上去威下
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http://www.hifidiy.net/face/face25.gifhttp://www.hifidiy.net/face/face25.gif我有TDA1541A已经很满足了
流唧吧
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http://www.hifidiy.net/UploadFace/1527_200412112364272088.gif
现在明了吧