想問邊度有人代整線性牛？？

kefana

有無好介紹？？

同幾銀？？

想整隻1出2比 magic tv 同 docking



唔該晒

billymud

師兄，要整淨牛？ or 成品 PSU (power supply) ? ........何不購成品？ ( ranged: $600 ~ $4,000)
      國內淘寶 or Taiwan 都有靚模擬PSU成品，你去search, 揀下喇。比 magic-TV/ STB 用，毋須太"執著"的；至多預購多幾款 電容/整流子作必要時調校之用，ok喇。

http://www.teddypardo.com/Produc ... lies/Teddy12-4.html


http://item.taobao.com/item.htm? ... &id=14961859810


http://post76.hk/forum.php?mod=v ... D167%26typeid%3D167

kefana

billymud 發表於 2013-3-7 18:30
師兄，要整淨牛？ or 成品 PSU (power supply) ? ........何不購成品？ ( ranged: $600 ~ $4,000)
      國 ...

thz.

淘寶同台灣野分別大唔大。


teddy over budget ………

一邊比docking 用。

billymud

kefana 發表於 2013-3-7 19:21
thz.

淘寶同台灣野分別大唔大。

again,  比 magic-TV/ STB 用，毋須太"執著"的 !  
Magic-TV << 12v
iPhone Docking (?) << 5v

for further comment, plz contact kenneth_obee C-Hing.  He's good on it.

kefana

billymud 發表於 2013-3-7 19:49
again,  比 magic-TV/ STB 用，毋須太"執著"的 !   
Magic-TV

hd docking  12v 2.5A.

爬過文個隻 台灣keces ok ma ??

不高成2k 買隻牛可改善既效果明顯嗎。

最衰唔識diy 唔係見d 師兄平成半。

唔該billy 兄先。

obee

Don't be silly.
For both docking and magic TV, use switching PSU is ok ga la.

Unless you never plug a hard disk (2.5" or 3.5"), then you can use good PSU with good image quality. Otherwise you have to modify the DC circuit for the hard disk and use two power supply source.

Because hard disk, especially the desktop size (3.5") kind, requires large current when starting the motor, if you use linear PSU in this case, you need to buy an overrated PSU for it, that is waste money and waste space.

kefana

kenneth_obee 發表於 2013-3-8 09:13
Don't be silly.
For both docking and magic TV, use switching PSU is ok ga la.

唔該晒kenneth 兄既指導。

有無推介？？

見你diy 個隻psu 好正。

obee

kefana 發表於 2013-3-8 09:44
唔該晒kenneth 兄既指導。

有無推介？？

For DIY, it's hard to control the cost. Because of quantity and your mindset.
quantity - you usually only need 1 or 2 piece of electronic item, the shipping cost and unit price usually high
mindset - DIYer usually want to make something as perfect as possible, or as cheap as possible... It needs experience to justify which part to 妥協, which part to 重料.

Buy factory made PSU has no the above two problems:
quantity - they buy in large lot, much cheaper raw material cost
mindset - they did a lot, with lot of experience, they know where to 妥協, and usually they won't 重料, only when the customer can "see". E.g. use beautiful, large capacitors.

For PSU, like Billy suggested:
1. Teradak - I've been used. It's bad quality, lot of 妥協. If you follow it DIY, you can make the same thing at same price, but you wasted your time.
2. KECES - I've been used, it is good quality, with good selection for place of 重料. Highly recommend.
3. Teddy - I havn't used, but from people's comment, it's good PSU

You may see some other PSUs, let's name it and we could discuss.

Finally, my little experience for linear PSU, quality depends on (in order)
1. Circuit design
2. Transformer
3. Capacitor

There's no secret, no need to buy those claim using "rare, NOS, expensive electronic parts". With cheap cheap electronic parts but good circuit design, everyone can make good linear PSU.

obee

kefana 發表於 2013-3-8 09:44
唔該晒kenneth 兄既指導。

有無推介？？

Recently I meet a guy in China forum, he makes some DIY parts:
http://bbs.hifidiy.net/viewthread.php?tid=679800

His name is Jeff, you may ask him. Tell him your need two 12V (5A); Two  outputs, see whether he has time to do for you or not.

kefana

kenneth_obee 發表於 2013-3-8 10:31
Recently I meet a guy in China forum, he makes some DIY parts:
http://bbs.hifidiy.net/viewthread.p ...

萬分感謝kenneth 兄。