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发表于 2004-12-14 22:51
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今天晚上回来开始搞散热器和机箱
今天傍晚在散热板转了32个4.2MM的孔,铜板上转了32个4.8的孔,还有几个2.2MM的孔,准备用丝攻攻孔,用3MM的螺丝固定MOS管,结果我的转头和两个3MM丝攻全报销了,孔还没转完,我崩溃了[em00][em00][em00],实在是太累了,DIY 真是一项系统工程啊,还得学金工!
散热器没搞定MOS管不敢接,手又痒了,于是又开始摆弄起来了。把推动级的两个发射极电阻的连接处之间与输出端用导线连起来,通电看看波形也好啊。
通电测输出端的电位有300MV左右,这种电流模电路结构的输出电位偏差是比其他的差分电流大的,所以都要用DC SERVO 来摆平直流电位,但是电路的性能还是不错的。于是接上了DC SERVO 板子,呵呵,就是下面那几幅
<img src="attachments/dvbbs/2004-12/20041214224437126.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/2004-12/20041214224437126.jpg\');}" onmousewheel="return imgzoom(this);" alt="" />
<img src="attachments/dvbbs/2004-12/20041214224524163.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/2004-12/20041214224524163.jpg\');}" onmousewheel="return imgzoom(this);" alt="" />
<img src="attachments/dvbbs/2004-12/20041214224620495.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/2004-12/20041214224620495.jpg\');}" onmousewheel="return imgzoom(this);" alt="" />
酷吧,用5个铜螺柱锁再大板上,立体双层结构,哈哈,爽呆了!
接上DC SERVO后再测输出电位只有0.5MV了,我用的是TL071做炮灰的,DZ用的是OPA134PA,看DZ上的一篇文章说是测试了用不同的运放放在DC SERVO 上,功放的味道会跟着这个运放改变,它试了几种运放,OPA134的话整个功放就是OPA134的味道,换成OPA627的话,就是OPA627的味道,真是奇怪了,等做完以后一定要试试! |
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