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发表于 2010-8-20 21:28:18
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原帖由 kldguitar 于 2010-8-20 07:12 发表
1。 功放相对于喇叭是源，它供应电流给喇叭，同时它有内阻，要消耗功率，他自己也有额定电流，当外界负载增大，其内部电流会加大，消耗到内阻上的功率加大，所以会发热。极端会烧掉。这就是喇叭阻抗不能大的原因。
... 原帖由 guiter 于 2010-8-20 08:44 发表
如果阻抗不需要匹配...我看amp后面也不需要弄4欧 8欧 16欧那么麻烦了...一个输出就ok了...guide上也不需要注明...必须严格按照输出阻抗来匹配的cab...这些不都是多此一举吗?
关于阻抗的问题...都是常识了...多说无 ...
If you do too high a load, the power tubes still limit what they put out, but a second order effect becomes important.
There is magnetic leakage from primary to secondary and between both half-primaries to each other. When thecurrent in the primary is driven to be discontinuous, you get inductive kickback from the leakage inductances in the form of a voltage spike.
This voltage spike can punch throughinsulation or flash over sockets, and the spike is sitting on top of B+, so it's got a head start for a flash over to ground. If the punch through was one time, it wouldn't be a problem, but the burning residues inside the transformer make punch through easier at the samepoint on the next cycle, and eventually erode the insulation to make aconductive path between layers. The sound goes south, and with an intermittent short you can get a permanent short, or the wire can burn though to give you an open there, and now you have a dead transformer.
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资料过大负载部分翻译大意如下：
过小的负载会引起大电流，过大负载会引起电流断续，不稳定。在输出变压器中形成尖状的感应电压，并且感应电压在音箱启动值。使变压器反复造成冲击，引起电火花，发热。冲击燃烧后的残余物更容易造成下一次的冲击。损坏变压器用于传导的层。
kldguitar文章估计你没看明白。观点与你是对立的。你无论大小负载都是大电流的说法，显然行不通。这证明你根本不懂。你在阐述这类问题时，告诉别人什么是定值，才有什么是变量。你的全部在变，让人不知你所云。另外你说的“江湖郎中”，请你对别人辛苦找来的资料尊重点。
guiter你回帖中心意思认为“这是常识”。你的说法是空架子。知其然，不知其所以然。本帖讨论的是其原因。回帖中没有发现你有更深入的理解。请你对知识给予尊重，不要一句话这是常识敷衍了事。给愿意交流的朋友以空间。 |
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发表于 2010-8-19 11:15:03
