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| [#1] etsang3 DIY 銅腰帶屏蔽火牛漏磁 見有問哩樣,又唔難DIY,做俾大家分享下。 仲有一個效果好好多,又簡單技術,就係..... "機牛分體"  |
etsang3 正式會員203.xxx.xxx.91 |
2008-11-30 12:08 | |
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| [#2] etsang3 DIY 銅腰帶屏蔽火牛漏磁 勁! But what is 絕緣漆? Is this 100% safe for long time and under warm temperature usesage? |
wo 正式會員 58.xxx.xxx.236 |
2008-11-30 12:52 |
| [#3] etsang3 DIY 銅腰帶屏蔽火牛漏磁 勁！勁！勁！如果環牛又應該點整呢？ |
kimming 正式會員 58.xxx.xxx.227 |
2008-11-30 13:03 |
| [#4] etsang3 DIY 銅腰帶屏蔽火牛漏磁 環牛罩 |
good 正式會員 58.xxx.xxx.246 |
2008-11-30 13:16 |
| [#5] etsang3 DIY 銅腰帶屏蔽火牛漏磁 師兄果然好野, 更難得是無私的向別人分享成果 |
lun2008 正式會員 210.xxx.xxx.13 |
2008-11-30 13:17 |
| [#6] etsang3 DIY 銅腰帶屏蔽火牛漏磁 etsang兄，其實我問題係隻牛令到起hum，已經試過將牛轉角度，但係轉角度有限，所以想包住隻牛...  |
kimming 正式會員 58.xxx.xxx.227 |
2008-11-30 13:39 |
| [#7] etsang3 DIY 銅腰帶屏蔽火牛漏磁 環牛漏磁最勁係邊間,頂同底係漏得最少,所以維邊包住就最好。 |
cctat 正式會員 218.xxx.xxx.138 |
2008-11-30 13:49 |
| [#8] etsang3 DIY 銅腰帶屏蔽火牛漏磁 kimming hing, 你部係NAIT-2 我都有幫朋友摩過部NAIT-2. 隻牛質數好高個渦, 試下回答我d問題等我唸唸... 1. 起喇叭聽到HUM? or 2. 甩左喇叭烘隻耳埋牛身聽到HUM? 3. 甩哂TAPE,AUX,TUNER,PHONO cable仲有無HUM, 係咪重係檔檔都有HUM ? 要注意原庄NAIT amp,係一定有小小HUM架(AUX檔,volume=max,烘隻耳埋喇叭聽),奀o6800uF x 2 濾波電容成部機用,一粒豆仔LM317就比Phono同Line amp用,加D R+C濾波電路稍作分隔。 如果不嬲都係小HUM,近來突然大左,可能LM317晌左勒 資料供你參考 ================================= Phono amp http://i20.photobucket.com/albums/b206/etsang3/Naim/PhonoStage.jpg Line amp http://i20.photobucket.com/albums/b206/etsang3/Naim/10XFaltamp.jpg Power amp http://i20.photobucket.com/albums/b206/etsang3/Naim/Poweramp-AA-1.jpg http://i20.photobucket.com/albums/b206/etsang3/Naim/Power-amp-circuit.jpg Transformer and Power Supply http://i20.photobucket.com/albums/b206/etsang3/Naim/NAIT2Transformer.jpg http://i20.photobucket.com/albums/b206/etsang3/Naim/PowerSupply.jpg  |
etsang3 正式會員 202.xxx.xxx.193 |
2008-11-30 15:29 |
| [#9] etsang3 DIY 銅腰帶屏蔽火牛漏磁 etsang3 兄 小弟diy用的EI 牛, 全部都有用這方法處理, 我用的是錫貼紙, 我通常都會十字型的橫直都繞一圈. 我還有一點要補充, 洗用貼紙型的銅或錫鉑, 因為金屬的一面有膠v緣, 所以要注意不能方死蝕底的繞幾圈或以, 否則會起電感, 仲會有煙冒出架 . ^^ |
211 正式會員 125.xxx.xxx.236 |
2008-11-30 17:34 |
| [#10] etsang3 DIY 銅腰帶屏蔽火牛漏磁 re: 因為金屬的一面有膠絕緣, 所以要注意不能方死蝕底的繞幾圈或以上, 否則會起電感, 仲會有煙冒出架 . ^^ |
211 正式會員 125.xxx.xxx.236 |
2008-11-30 17:36 |
| [#11] etsang3 DIY 銅腰帶屏蔽火牛漏磁 estang兄，我部nait2係完全冇input情況下，都有hum聲，甩左喇叭烘隻耳埋牛冇hum，比過樂聞check，師傅話係隻牛影響，所以先會諗到用野包住吽C我將LM317換左做LT317，會有影響嗎？請指教！ |
kimming 正式會員 58.xxx.xxx.227 |
2008-11-30 22:45 |
| [#12] etsang3 DIY 銅腰帶屏蔽火牛漏磁 理論上漏磁是magnetic flux, copper sheet is electrical conductor, it is not the metal for magnetic flux ( while iron sheet can let magnetic flux to form close loop --- to form the 屏蔽 effect). But in the market, some transformer is doing the shielding by Copper sheet like below.... May be I am wrong, Please discuss. |
kwok787 正式會員 221.xxx.xxx.125 |
2008-11-30 22:50 |
| [#13] etsang3 DIY 銅腰帶屏蔽火牛漏磁 etsang3 hing, thanks a lot for your sharing. cheers. |
sugizo 正式會員 58.xxx.xxx.24 |
2008-11-30 23:52 |
| [#14] etsang3 DIY 銅腰帶屏蔽火牛漏磁 kwok787 hing, this method is called Faraday Shield. You may please read this.. Faraday Cage Effect The Faraday cage, which is an effect discovered by Michael Faraday in 1836, depends on these principles. A Faraday cage is an enclosed conducting shell. It can be a solid conducting shell or a shell made of wire mesh; the important thing is that it completely encloses a region. This hollow conducting shell will have no electric field inside, even when placed in a very strong external electric field because the charges on the conducting surface rearrange themselves until the electric field inside is zero. "A Faraday cage also works in reverse. If there is a strong electric field inside, the field outside the cage will be zero." This Faraday cage effect causes Faraday cages to act as shields for strong electric fields or other electrical effects. In addition electromagnetic waves consist of oscillating electric and magnetic fields. Therefore Faraday cages effectively shield electromagnetic waves or electromagnetic radiation as long as the holes in the wire mesh are significantly smaller than the wavelength of the electromagnetic waves. For this reason Faraday cages are sometimes called Faraday shields. http://electricitymagnetism.suite101.com/article.cfm/understanding_the_faraday_cage |
etsang3 正式會員 219.xxx.xxx.240 |
2008-12-01 00:16 |
| [#15] etsang3 DIY 銅腰帶屏蔽火牛漏磁 小弟過錫紙包住.. 但ng多得.... ＞.＜ |
hiphopzz 正式會員 222.xxx.xxx.8 |
2008-12-01 00:44 |
| [#16] etsang3 DIY 銅腰帶屏蔽火牛漏磁 kwok787 hing, 理論上漏磁是magnetic flux, copper sheet is electrical conductor, it is not the metal for magnetic flux ( while iron sheet can let magnetic flux to form close loop --- to form the 屏蔽 effect). But in the market, some transformer is doing the shielding by Copper sheet like below.... May be I am wrong, Please discuss U right, U can try to put one copper plate & one iron plate beside the transformers & use a compass to test. simple testing. will know |
tubediyer 正式會員 219.xxx.xxx.42 |
2008-12-01 00:48 |
| [#17] etsang3 DIY 銅腰帶屏蔽火牛漏磁 etsang3 hing, Thanks for your information. Faraday Shield is talking about the electric field. The Faraday Cage is also constructed by wire mesh for shielding. For HiFi issue, both electric field and electromagnetic field are not wanted in the equipment. Why don't we just use the metal casing to enclose the transformer to achieve the both effect and not to affect the other electronic components? It is a most simple method. Why use copper sheet....? |
kwok787 正式會員 221.xxx.xxx.131 |
2008-12-01 12:57 |
| [#18] etsang3 DIY 銅腰帶屏蔽火牛漏磁 My understanding of the copper strip is not to create a Faraday shield but rather to create a single turn low impedance secondary circuit to effectively capture and utilise all stray magnetic flux that leaks beyond the EI core. Hence, any leaking magnetic fux, instead of being picked up by sensitive components, is shrink to form a closed loop near to the transformer. So, if your transformer leaks a lot and you are using multi-turn with your copper strip, its SMOKES!!! |
CYI 正式會員 202.xxx.xxx.158 |
2008-12-01 12:59 |
| [#19] etsang3 DIY 銅腰帶屏蔽火牛漏磁 sansui AU-719  |
沙田超人 正式會員 221.xxx.xxx.76 |
2008-12-01 13:26 |
| [#20] etsang3 DIY 銅腰帶屏蔽火牛漏磁 Folks: Please see the last section on the attached link for details on why the copper foil helps to reduce magnetic induction from the transformer. http://williamson-labs.com/480_shi.htm Hope this helps. Steven |
StevenLee 正式會員 58.xxx.xxx.244 |
2008-12-01 18:33 |
