我的LM4780也来了

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我的L4780也来了

我的L4780也来了

文招

以下是引用HQ在2005-2-8 15:17:00的发言：


[em09][em11]

近年的确很忙，那只是忙里偷闲焊出来的，你看那板上的元件还未焊完[em11][em11]

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以下是引用fu-80在2005-2-8 14:29:00的发言：
万一短路````嘿嘿````

要是真有万一的话，那LM4780的管脚更可怕[em06][em06][em06]

HQ

[em09][em11]

fu-80

土八路

[em05][em05][em05]

fu-80

万一短路````嘿嘿````

qpzmg

[em11]我觉得那IC应该设计得出来一点，好安装散热器，要不像现在的PCB焊了IC之后要加上一块铜板或铝板在后面，才能连到大散热器上，这样一来对引热不好，而且还得另外找一块铝板，二来嘛，嘿嘿……就是安装起来有点麻烦，我个人是这样认为，不知道其他的朋友们对此有什么看法。

<img src="attachments/dvbbs/2005-2/200528142756922.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/2005-2/200528142756922.jpg\');}" onmousewheel="return imgzoom(this);" alt="" />

雨衣妹妹

摸起来暖暖的才好呢。对了开声了吗？

土八路

冇的办法！[em02][em02][em02]

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以下是引用土八路在2005-2-8 13:10:00的发言：
[em11][em11]

[em05][em05][em05]

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<img src="attachments/dvbbs/2005-2/20052813955166.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/2005-2/20052813955166.jpg\');}" onmousewheel="return imgzoom(this);" alt="" /><img src="attachments/dvbbs/2005-2/200528131025199.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/2005-2/200528131025199.jpg\');}" onmousewheel="return imgzoom(this);" alt="" />
散热器尺寸14cm宽,7cm高,齿长3.5cm,共18条齿，基板8mm,我估重量约1.5斤。
每块散热装一片LM4780,不知可否够大.但等米用不如找米用。不够的话再换吧[em11][em11][em11]

seabreeze

[em10][em11]

土八路

[em11][em11]

文招

[em05][em05][em05]

seabreeze

里面不是电阻丝无感绕制的吗?[em11]

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<img src="attachments/dvbbs/2005-2/20052812159518.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/2005-2/20052812159518.jpg\');}" onmousewheel="return imgzoom(this);" alt="" />
0R47的电阻我用二个0R22的串联代替[em11][em11][em11]
我认为金属膜的比那些水泥仔好用[em06]

土八路

[em00][em00][em00][em00][em02]

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<img src="attachments/dvbbs/2005-2/20052811444492.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/2005-2/20052811444492.jpg\');}" onmousewheel="return imgzoom(this);" alt="" />

文招

刚才试了保护电路，一切正常，但坛上的保护自锁方式不合我意。因为有时中点不稳易跳开（以前装分立常有，但LM4780应没有）[em11][em11]按我的习惯，还是改为自恢复方式。这时就应将板上的223电容拆下（不拆也行），直接短接它即可[em06]这样保护电路跳开后，只要工作又正常了就又有声音啦[em11][em11]
我还在板上加了一个发光管作工作指示用，很简单，用一个发光管串一个5K1的电阻并在继电器线圈上[em08][em08][em08]