Kchu1377 發表於 2010-12-5 16:57:15

DIY Linear PSU for Onkyo ND-S1

Hi,

I'm new to this forum and I'm looking to DIY a low noise Linear PSU for my Onkyo ND-S1 Ipod dock.

Input: 220AC
Output: 5VDC 1-2A
IEC AC Socket

Any one know where I can find a DIY kit like the one below for a better price or performance?
http://www.welbornelabs.com/squeeze.htm

KK sir, is there a class on how to build one of these

Cheers,

Kevin

kk_ho 發表於 2010-12-5 18:40:31

我正在做緊呢個Super PSU.
係套件,不開班的。
LM334X2,電流鏡影,有softstart.
Fuse, 水線。
用C-CORE牛。
全RMG電阻設定,Blackgate 電容。
其餘全部表面貼零件。
Schottky diode 搭載。

用X10同一款机箱。

Kchu1377 發表於 2010-12-5 23:48:18

回復 2# kk_ho


KK sir,

When will it be for sale and about how much?


Thanks,

Kevin

kk_ho 發表於 2010-12-6 03:19:22

Feb-2011.Over 1K.

roy 發表於 2011-2-1 09:23:15

本帖最後由 roy 於 2011-2-1 09:26 編輯

Hi,

I am new comer for this Forum.
I saw this topic and had same idea and make my own PSU for my DAC & Headphone AMP.
Just made Dual PSU using LM1085/LM317 with compact metal case.
This is my first prototype. I already made two PCB (one for AC EMI filter, other for regulator parts)

Any comment are welcome.



kk_ho 發表於 2011-2-1 09:30:53

Roy,

How much current output for ND-S1 ?

KK.Ho

roy 發表於 2011-2-1 13:43:20

I don't own ND-S1, according to this user manual, their adapter is 5V 1A.

My adapter uses 30W transformer 12VAC. I had VR to adjust output voltage to fit my player.

I use this for my Cambridge Audio dacmagic2 DAC (note :it uses AC12V) & HeadAMP from www. hifidiy.net
, also any portable device such are CD discman, MP3 player etc.

roy 發表於 2011-2-1 13:51:04

LM1085 can give max 3A output where LM317 can only give 1.5A.

If uses 5V output base on 12VAC to DC then I/P to LM1085. It become very hot becasue of high voltage drop. If under 1A continues supply I think it should be acceptable as I am using the metal case as a heatsink.

Kchu1377 發表於 2011-2-4 13:23:55

回復 8# roy

I also build my own

http://www.post76.com/discuss/redirect.php?tid=56393&goto=lastpost

kk_ho 發表於 2011-2-4 17:55:49

空間可以一般"吾用"IC"穩壓,改造性不高。
我用分立元件造。

roy 發表於 2011-2-4 19:15:13

本帖最後由 roy 於 2011-2-4 19:16 編輯

One of benifit to use discrete is high S/N ratio. Normally regulator IC just gives @70dB (max). If good circuit discrete design it can reach higher than this value. However, PCB size will relative bigger because of increase components, typically design using Transistors & OP-AMP as well as reference IC for combinaton
I prefer compact size and high flexiable, multiple adjust output so that I choose Regulator IC.

imtbck 發表於 2011-2-6 18:52:38

How about 12v >5A DIY Power supply, i wanted to use for my media player Himedia hd800b.

roy 發表於 2011-2-16 20:33:40

本帖最後由 roy 於 2011-2-16 20:36 編輯

Woo, is it really need such high power (12V 5A ~60W)?? It is possible using LM1085 but need a shunt transistor to share some current as LM1085 Max can only give 3A.

Also, Transformer need at least 80W for maintain output if HD800b always eat such high power.

I am under checking on my latest PCB which has shunt transistors for sharing current, now is under evaluation and wait for custom make transformers.

imtbck 發表於 2011-2-17 20:07:08

Hi Roy, thanks for your replied, by the way, may be, i need to measure the ampere of my player and decide the next step... may be on sunday.
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