32 LED手电改造

qdbirds

<P><img src="attachments/dvbbs/2005-9/20059292104033982.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/2005-9/20059292104033982.jpg\');}" onmousewheel="return imgzoom(this);" alt="" /></P>
<P>花了70+15元</P>
<P><img src="attachments/dvbbs/2005-9/20059292051374165.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/2005-9/20059292051374165.jpg\');}" onmousewheel="return imgzoom(this);" alt="" /><br><br>虽有“反光碗”，实际却没多大作用。LED品质不太好，用透镜看投影有五六颗颜色发黄<br><br><img src="attachments/dvbbs/2005-9/20059292072773122.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/2005-9/20059292072773122.jpg\');}" onmousewheel="return imgzoom(this);" alt="" /></P>
<P>本来是两种点亮方式，内14或全32亮，已改成全亮全灭。为了加散热片，把焊点搓平<br>点亮几分钟后很热，估计有近50度（忘记实测）</P>
<P><img src="attachments/dvbbs/2005-9/200592920105756849.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/2005-9/200592920105756849.jpg\');}" onmousewheel="return imgzoom(this);" alt="" /><br><br>花20元找人加工的散热片（7两铜棒28元），用导热硅胶灌封<br><br></P>
<P><img src="attachments/dvbbs/2005-9/200592920261948406.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/2005-9/200592920261948406.jpg\');}" onmousewheel="return imgzoom(this);" alt="" /><br><br>两段切换开关，左边串1欧姆，右边串0.39欧姆<br>这个开关可以自己该成4段切换（甚至8段），不过在这个手电上2段足够。市面上有类似的2段开关，比这个厚3MM，如果开关内部是旋转式的也可以改<br><br>上面是昨天拍的，散热片已粘好，电筒已经装配完毕。凡有利于散热的地方都涂了导热硅脂，开5分钟后灯杯发热明显，8分钟后桶身发热明显，室温23度，灯杯33度。散热片外径有些小，与筒身接触面小，影响了散热效果</P>
<P>下面是测试数据</P>
<P>5:37  0.63A<br>6:13  0.60A<br>8:20  0.39A  0.66A(0.39欧，这会切换过来电流有点大)<br>8:37  0.37A  0.63A（正式切换到0.39欧姆档）<br>………………</P>
<P>………………</P>

[此贴子已经被作者于2005-9-29 21:02:06编辑过]

sjb3658

<P>改风冷。。。</P>

冰冻小章鱼

光斑图？哈

junfeixu

<P>接触到会短路，不接触如何散热？？？</P>[em06][em06][em06]

qdbirds

<P> <img src="attachments/dvbbs/2005-9/200593023232749113.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/2005-9/200593023232749113.jpg\');}" onmousewheel="return imgzoom(this);" alt="" /><BR></P>
<P>这是卖家拍的，左边是新三娃。不过这是在32led没串电阻的情况下拍的，4.2v时大约930ma，在这个状态下灯头是不会长久的…………<BR><BR>散热片与led正负极虽不接触（间隔2mm），但导热硅胶可以导热。本来想换好一点儿的led，将全部的负极焊到散热片上，这样散热效果会更好，可惜因急用来不及折腾</P>

qdbirds

昨天从8:37切换到0.63A，持续不到15分钟就明显变暗，虽然这节电池有些老化，不过即使是好电池在这个时候切换也有些迟了。把0.39欧姆换成0.72欧姆，在使用2小时后切换比较合适（约0.64A），后2小时与前2小时的亮度曲线比较接近。

sjb3658

<P>很好。</P>

junfeixu

原来那个空隙靠硅胶！！！

qdbirds

<DIV class=quote><B>以下是引用<I>junfeixu</I>在2005-10-2 22:00:18的发言：</B><BR>原来那个空隙靠硅胶！！！</DIV>
<P>
<P>是<FONT color=#ff0000>导热</FONT>硅胶，CPU用的[em06]</P>