自製240V AC Mains Filter

dmc-12

因為係DIY, 所以決定Post 係呢到 Instead of Post 係「影音領域 」... 如果貼錯, 請見諒!

平時D Mains Supply 有RFI, voltage spike...等等嘅interenference, 對耳挑剔D都可能會聽到個Speaker "Tac Tac"聲.... 嚴重D仲可能會係個Mon/TV 睇到D雜訊添!

High end D 嘅Mains Filter 分分鐘要成幾千元先有得傾~ 唔想用gum 多錢, 但又想少Ｄ雜訊？試吓呢個Parallel Mains Filter 幫唔幫到手啦! 唔得先買高級Filter 都唔遲嘛!

用料:
1 275V AC Varistor (Voltage Dependant Resistor)
1 Capacitor X1 Class 0.1uF
2 Capacitor Y Class 0.0022uF
1 普通13A Mains Plug
1 1A Fuse

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Wiring Diagram
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DIY 過程

先分拆個Mains Plug
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之後決定安裝個0.1uF Cap 嘅地方
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如果需要, Mark 下要Cut 走嘅部份
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好Fit!
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同樣, 決定安裝VDR & 2 個0.0022uF Cap 嘅地方... Fit 好後Cut 腳
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Prepare 好嘅Parts
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加Insulation Tape
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安裝過程:
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完成!
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宜家Plug 呢個Filter 到近 Noise Interference 嚴重嘅地方... 開Speaker, 開Mon, 睇吓仲有無gum 多Noise?

我建議做多幾個, Plug 係屋內好幾個地方 (如: 近洗衣機, 雪櫃嘅插頭)... 效果會好D! D Parts 噤少, 又平, 做多幾個有幾難!?

呢個Filter 嘅原埋係張所有鄰近嘅Noise平定化:

個0.1uF & 0.0022uF Cap 負責平定RFI
而個VDR 就負責平定 Voltage Spike

注意: 記得個Fuse 要用越細 Amp 越好... 個人認為1A 或以下啦!
仲有! 我係唔會為任何人因為睇咗呢個Post, 自己去試做而發生嘅任何意外負上任何責任! DO IT AT YOUR OWN RISK!!!

[ 本帖最後由 dmc-12 於 2007-11-22 11:13 編輯 ]

果汁機

問題?

1)我不明白你不接線(負載)有效果嗎?

2)如果直接將電子零件安裝在蘇底是不是比較容易?

3)L==>Capacitor Y Class 0.0022uF==>E==>
Capacitor Y Class 0.0022uF==>N 要經過Earth會否因為落地而發生跳掣?

4)可以解說一下你的電子零件作用是什麼用途 ?

請大大解答..

[ 本帖最後由 果汁機 於 2006-5-5 08:54 編輯 ]

dmc-12

1) D Parts 本身都已經好細小, 冇需要接線噤麻煩... 不過接線效果同唔接線一樣 (不過唔好太長!)

2) 係, 不過我個做法可以話拆就拆嘛!

3) 唔會.... L=>E   and N=>E  用意係張D Mains 嚟嘅Noise Pass 到Earth

4) VDR, Voltage Dependant Resistor 係會因 Voltage 而變Resistance 嘅Resistor. 用嚟控制唔穩定嘅Voltage... 令到鄰近Parallel 嘅Voltage 都會穩定D

而嗰兩個Y Class Cap 就係張D Mains 嚟嘅Noise Pass 到Earth

Fuse, 就simply 用嚟 Just in case 保護你同你D電器law ~

[ 本帖最後由 dmc-12 於 2006-5-5 11:46 編輯 ]

dino_lo

三粒cap 是否要用????( 300vac 的金屬膜).

dmc-12

原帖由 dino_lo 於 2006-5-5 10:36 發表
三粒cap 是否要用????( 300vac 的金屬膜).

Not totally necessary... depending on what you are after.

The two Y class Cap is not necessary if you do not need a connection from L=>E and N=>E

The X Class Cap and VDR needs to be used together (ie. the connection between L and N)

But since all the parts are not expensive, why not do it all anyway?

Bread

I wanna to ask two questions
1) How much did you spend on this mains filter?
2) Can I use the capacitors with higher capacitance?(like Y cap: 220nF)
Thanks a lot.

Bread

原帖由 dmc-12 於 2006-5-5 09:11 發表
1) D Parts 本身都已經好細小, 冇需要接線噤麻煩... 不過接線效果同唔接線一樣 (不過唔好太長!)

2) 係, 不過我個做法可以話拆就拆嘛!

3) 唔係.... L=>E   and N=>E  用意係張D Mains 嚟嘅Noise Pass  ...

第三點就真係好有用
我部電腦內的電源都是這樣

之前我把cap 落在 +v and GND(唔係Earth，只係大四頭內的黑色線，0V)
沒什麼分別

一星期前無聊，落 cap 在+v and Earth(接機箱)

加了後，張sound card分析力improve到你都唔信

p.s. +v : +3.3V, +5V, +12V

dmc-12

I pay for the parts in UK... hence it will me more expensive than if you do one in HK.

1) I bought enough parts to make three of these, and it cost about HKD25 to complete one.

2) The values I have mentioned is optimised for UK and HK mains voltage (and I took apart high end mains filter before, and they also used the value I used), so if I am you, stick with 2.2nf

Bread

原帖由 dmc-12 於 2006-5-5 11:39 發表
I pay for the parts in UK... hence it will me more expensive than if you do one in HK.

1) I bought enough parts to make three of these, and it cost about HKD25 to complete one.

2) The values  ...

Such a detailed reply, thank you very much
I will try to buy parts this afternoon and make it toworrow(I have to retake CE)