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音响DIY过程的接地方法

admin 2018-03-29 19:45:32 无损音乐交流 0℃
一点接地,我觉得或者可以分为三个层面:一是本级的一点接地,二是PCB板级的一点接地,三是系统级即整台机子的一点接地。理论上一点接地很好,但在这三个层面里,越往后,就越有实际制作上的问题(比如地线过多等)我看到少量提及地线安排的境外制作实例,除非线路特别简单,多是采取串联接地(即逐级的地线按原理图串联起来)、或一点接地与串联接地(即本级采用星形一点接地,然后逐级串接)。   另外,作为模拟低频放大器,较少采用大面积就近接地,因此一般要避免地线形成环路(避免造成后级的电流流过前级的地线)。由于放大器多是双声道的,他们两个声道要共用一个机壳,就产生一个共接点,处理不好,很容易形成环路电流,这点须加以注意。   关于机箱的接地点,RCA处接入(上面的朋友已提及)、就近变压器接入、就近电源处接入,都有人采用。我想说的是,若果接地点远离RCA输入端时,有可能因此出现交流声——据说是RCA与接地点感应电位不同而造成——可在RCA插座的冷端(地线端)就近与机箱接一个0.01μ的电容来解决。

A bit ground connection, I feel OK perhaps to cent is 3 levels: It is a bit ground connection of this class, the 2 a bit ground connection that is PCB board class, 3 it is systematic level makes station machine namely child a bit ground connection. A bit more theoretic ground connection is very good, but in these 3 levels, jump over in the future, have the problem that makes actually more (for instance ground wire passes to wait more) I see a few alluding example is made outside the condition that ground wire arranges, unless circuit is special simple, it is to accept series connection ground connection more (the ground wire that pursues course namely rises by principle graph series connection) , or a bit ground connection and series connection ground connection (namely this class uses astral form a bit ground connection, chase class to string together next receive) . Additional, regard imitate low frequency as amplifier, use ground contact of large area nearby lesser, because this should avoid ground wire commonly,form annulus way (the ground wire of the class before the electric current of the class after avoiding to cause has flowed) . Because amplifier is of dual track more, two their track want common a housing, produce in all contact, processing is bad, form annulus road electric current very easily, this bit of beard tries to notice. About the ground connection dot of box, RCA place is received (the friend above already alluded) , nearby transformer is received, place of nearby power source is received, somebody is used. I think those who say is, when if receive a place to be far from RCA if really,the input is carried, appear accordingly likely hum -- it is potential of RCA and induction of ground connection dot allegedly differ and cause -- can be in the Leng Duan of RCA electrical outlet (ground wire is carried) the capacitance that nearby and box receive a 0.01 μ will solve.

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