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单片机项目总结(一)-- 稳定性

慎用焊锡膏

galeki posted @ 2009年10月17日 02:00 in 单片机 , 15663 阅读

焊东西都要加点助焊剂,一直以来用松香,便宜又好用,但是焊多脚的 SMD 贴片很不方便,后来换成日本产的一款焊油,相当好用。

但是这个日本焊油太贵了,而且含铅,前两天正好买元件,就顺便买了个国产的焊锡膏,两块钱一大桶,心想可用 n 年了。

结果,就被这桶焊锡膏搞了,晚上焊了几块板子,焊的时候感觉不错,甚至比那款日本的焊油感觉都好用,不过焊完了问题就来了。

先是工作电流应该只有几 uA 的电路,一上电就有三四 mA 的电流,而且还在不断变化,但是电路板上却找不到短路的地方,似乎一切正常。

于是开始一个一个拆元件,排除错误,哪里连焊了?芯片烧了?电容穿了?过孔连了?……

都不是。

最后我就震惊了,因为把所有的原件都拆除,就剩一张空板子,上电还有 1mA 左右的电流……

然后才怀疑到这个新焊锡膏上,测试了一下,果然如此。

拿了张新板子,板子上有一个 QFP 封装的 100pin 芯片,虽然引脚很密,但两个引脚肯定是绝缘的。

但是粘点焊锡膏,然后再拿烙铁烫烫刷刷,再测,竟然两个相邻的引脚有 50K 电阻!引脚相邻越远,电阻也就越大,不过即便很远的两个引脚,也有 2M 左右的电阻。

这下总算知道了为什么测不出短路,但是还有这么大的电流,因为这个焊锡膏,不是完全绝缘的!

可上焊锡膏的壳子上却印着”绝缘性良好“,网上查了一下,也确实有人提到焊锡膏腐蚀性很大,不适合电子焊接。

我也不知道是真不适合,还是国产货的质量太差,还是使用方法不对,也许是焊锡膏把板子腐蚀坏了吧。总之现在还是老老实实用回那个日本焊油和松香了了,虽然贵但是放心啊。

为了贪便宜耗费了一个晚上……

图为罪魁祸首。

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K*K 说:
2009年10月17日 18:25

我也买了这个焊锡膏 -_-#

不过焊的都是电灯泡啊之类的线,所以没碰到你那么麻烦的问题,简单线路还是可以顶一下的。

Druggo 说:
2009年10月17日 19:53

OMG!这玩意就不是给微电子用的,这锡膏的样子几十年了都没变啊!我小时候家里有,不过书上都介绍不能用,还是松香吧。

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galeki 说:
2009年10月17日 23:08

@K*K:
@Druggo:
T_T 入行时间太短,没经验,以为焊锡膏就是粘状的松香之类,都可以通用。这个焊锡膏还是在电子元件店买的,谁想到……

Avatar_small
yuan 说:
2009年12月02日 00:33

我倒……我拿出我的焊锡膏一看,和图上的一模一样……
另外,想请教一下,这些东东入门有什么教材可以看?我羡慕那些DIY音响设备的人,也想学学。

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galeki 说:
2009年12月02日 02:49

@yuan: 音箱设备估计都是模拟电路吧,目前是模拟电路盲,也想入个门,搞些晶体管之类的书看看,应该不错~

goofyswitch 说:
2010年5月02日 06:30

是听过这东西很害人! 我都不用助焊剂了,原因是国外很环保根本买不到松香,高级货又贵的根本想都别想!我焊0.2mm的smd都是先在要焊的地方附近用烙铁烫一下焊锡,这样会释放出一层松香雾,雾凝固在要焊的物体表面就会起到很好的助焊作用!

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galeki 说:
2010年5月02日 14:42

@goofyswitch: 松香不环保吗?我用焊锡膏是因为方便,而且可以顺便用焊锡膏的粘力固定一下 IC~

大刘 说:
2010年6月06日 05:38

模拟电路不是太好的话,也能进入数字电路的门吗?我上学的时候数模电路都没学好,现在觉得后悔。我感觉模拟电路的基本知识不明白的话,我想不明白怎么进行数字电路的学习。有什么好的建议吗?谢谢。

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galeki 说:
2010年6月06日 06:39

数字电路初级阶段不牵扯什么模拟电路的知识,到后期和实际操作时候才需要一些模拟知识,可以两者一起看,完全不干扰~

black 说:
2010年9月24日 02:55

有一种叫焊宝的东西,LZ知道这是干什么的么?我当初也是不懂,买回来当助焊剂用,可是助焊效果烂透了,而且一用它烙铁头就烧死不粘锡了。屡试不爽。

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galeki 说:
2010年9月24日 08:44

貌似有很多助焊剂都叫这个名字,但是品质差异太大了,再碰上个假货就玩完了,所以现在只敢用松香,焊 IC 的时候只敢用日本的那个 PASTE 焊膏……

xRAIN 说:
2011年9月28日 20:48

这个主要成分是氯化锌吧, 三十年前焊洗脸盆用的。

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galeki 说:
2011年10月10日 16:22

原来是焊电灯泡和脸盆用的,我拿来焊芯片杯具了

zbwu 说:
2012年6月24日 16:45

家里有一盒一样的~用了一次就后悔了ToT

t.k. 说:
2013年5月07日 12:15

就是因为搜索这个焊锡膏找到你的博客的。。。感谢分享这个经验

7777 说:
2021年1月03日 21:37

我焊的ds1302晶振总是不起振,用烙铁烫一下能好一会,隔几天又不行,可能就是因为它

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