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音響DIY過程的接地方法

admin 2018-03-29 19:45:32 無損音樂交流 0℃
一點接地,我覺得或者可以分為三個層面:一是本級的一點接地,二是PCB板級的一點接地,三是系統級即整臺機子的一點接地。理論上一點接地很好,但在這三個層面里,越往后,就越有實際制作上的問題(比如地線過多等)我看到少量提及地線安排的境外制作實例,除非線路特別簡單,多是采取串聯接地(即逐級的地線按原理圖串聯起來)、或一點接地與串聯接地(即本級采用星形一點接地,然后逐級串接)。   另外,作為模擬低頻放大器,較少采用大面積就近接地,因此一般要避免地線形成環路(避免造成后級的電流流過前級的地線)。由于放大器多是雙聲道的,他們兩個聲道要共用一個機殼,就產生一個共接點,處理不好,很容易形成環路電流,這點須加以注意。   關于機箱的接地點,RCA處接入(上面的朋友已提及)、就近變壓器接入、就近電源處接入,都有人采用。我想說的是,若果接地點遠離RCA輸入端時,有可能因此出現交流聲——據說是RCA與接地點感應電位不同而造成——可在RCA插座的冷端(地線端)就近與機箱接一個0.01μ的電容來解決。

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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