arc4的电流声
在cpf讨论原贴：<A href="http://www.candlepowerforums.com/ubbthreads/showflat.php?Cat=&Number=513083&page=1&view=collapsed&sb=5&o=&fpart=1" target="_blank" >http://www.candlepowerforums.com/ubbthreads/showflat.php?Cat=&Number=513083&page=1&view=collapsed&sb=5&o=&fpart=1</A>内容引用如下：
Last night, I heared my arc4 has current noise when set to level 1. And then i tried other levels. There\'s no current noise between 2 to 6 level, but has little noise between 7 to 12, and no noise between 13 to 16.<BR>What is this matter? Dose it harm to anything?<BR><BR>weisar.
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Yes, that is normal. The volume and frequency will change with temp, battery type, level selected, etc. Most of the time it is not audible. This is what is called "inductor sing" and is a result of the windings in the inductor vibrating. Again, this is normal and does not indicate any problem or damage.<BR><BR>Peter <BR>－－－－－－－－－－－－－－－－－－－－－－－－<BR>Thanks Peter for the succint explanation, I was wondering the same thing, as on level 1, it is noticeable. Also, I\'ve noticed in my LSH-P the noise does vary depending on the battery I use.<BR><BR>daloosh <BR>－－－－－－－－－－－－－－－－－－－－－－－－
So you can hear the regulation working. Maybe Arc should offer a tuning fork for \'10% remaining\' frequency.<BR><BR>Stef <BR>－－－－－－－－－－－－－－－－－－－－－－－－
Is the inductor potted in epoxy? I don\'t know much about electronics, but I\'d think a little dab would be enough to keep it silent. <BR>－－－－－－－－－－－－－－－－－－－－－－－－－
Yes, it is potted in epoxy. But at these power levels the epoxy only dampens some of the noise. <IMG alt="" src="http://www.candlepowerforums.com/ubbthreads/images/graemlins/smile.gif"><BR><BR>The flyback in a tv or your laptop power "brick" are also usually potted. <BR><BR>Peter <BR>－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－
I think the term is \'magnetorestriction\'. It\'s the property of a substance to change size under magnetic flux. Most ferous metals do it to some extent. The Navy uses strongly magnetorestrictive materials for their sonar transducers. The amount of force that they can provide is critical when your vibrating element (speaker cone, so to speak) is being crushed by a few hundred meters of sea water. <BR>－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－
<b>大意是peter对电流声做了解释，肯定了电流声存在是正常现象，没有任何不利影响。以及解释了arc为什么没有通过epoxy方法消除电流声。</b>
请问Epoxy方法是什么？ <DIV class=quote><B>以下是引用<I>电筒迷在2004-3-20 11:09:04</I>的发言：</B><BR>请问Epoxy方法是什么？</DIV><BR>我理解大概是在传感器上涂环氧树脂。呵呵，根据上面英文帖子的回复瞎猜的。 ARC4有电流声，那么你用过的E1E+KL1有没有？它是不是个普遍现象（指电流声）？ 没有。kl1发热量小，看样子效率很高。
从ARC4能干扰收音机来看，电磁兼容性不合格。 KL1特意仔细听过，没有电流声音。 靠，什么都是正常的，它的东西是那么的完美吗？
我用过那么多的电筒，里面用开关电源的也不少，为什么都没有电流声。ARC的高级呀，电流声也比人家高。它的声音如果正常的话，那别人的电筒岂不是超级的正常。照这样说的话，我的开关电源DC-DC组件是超静音的，装在电筒里面，把电筒贴在收音机上一点点干扰都听不到，那就是超低干扰的。呵呵，像广告词，我说的如果不合适的话，版主可以删掉。
[此贴子已经被作者于2004-3-20 23:46:48编辑过]
很多开关电源回路均有电源声！只是看做得好不好而已！ 一般的来说，不是专业测试的话就感觉不到电流声的。如果很明显的听到，那就是不合格的产品了。
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