電腦電源相位校正CAS出靚聲

天下第一刀

alamakazam 發表於 2012-12-19 07:45
I think this is the lowest noise in consumer market

corsair ax1200i

I'm not sure the corsair ax1200i that is active  PFC and single  pulse-width
modulators and it's MID-end only. Can you tell me what IC and MOSFETs inside?
But I'm sure the X7 is the best design for Hiend audio amplifiers.
http://www.hardwaresecrets.com/p ... -Supply-Review/1446
It's UCC28070 and UCC3895 inside;
The UCC28070 is an advanced power factor correction device that integrates
two pulse-width modulators (PWMs) operating 180 dgree out of phase.
The UCC3895 is a phase-shift PWM controllerthat implements control of a
full-bridge power
stage by phase shifting the switching of one half-bridge with respect to
the other.It allowsconstant frequency pulse-width modulation in conjunction with resonant zero-voltage switchingto provide high efficiency at high frequencies. The part can be used either as a voltage-mode orcurrent-mode controller.

X7 uses a synchronoud rectification design in it's secondary, That mean
the diodes were replaced with MOSFETs........

Anyway,We must open the power supplies to see inside parts before order .
The profiteers cheated people right and left.

ilccmcf

想靚聲必定用notebook 唔插火牛聽。

大機用太多風扇EMI一定高，幾靚幾貴既牛都無用。唔算真正玩家。

ok102006

usb linear power supply + ssd in an external usb case

天下第一刀

ilccmcf 發表於 2012-12-19 10:53
想靚聲必定用notebook 唔插火牛聽。

大機用太多風扇EMI一定高，幾靚幾貴既牛都無用。唔算真正玩家。 ...

用notebook 唔插火牛,那么你的ＡＭＰ都最少要用电池先有效。
notebook里面的时钟精度很低，是否有适合notebook的专业数码声卡卖？

如果不用ＨＩＥＮＤ的图形卡，那么用１０００Ｗ以上，效率92%以上的牛可以拆除所有风扇。

我用７００Ｗ的电脑牛拆除风扇给４声道汽车ＡＭＰ作ＣＡＳ，７００Ｗ的电脑牛也不发热。

天下第一刀

ok102006 發表於 2012-12-19 12:20
usb linear power supply + ssd in an external usb case

That's sombody think is ! and it's not CAS . and that project is not better than SA8004.

ilccmcf

天下第一刀 發表於 2012-12-19 13:12
用notebook 唔插火牛,那么你的ＡＭＰ都最少要用电池先有效。
notebook里面的时钟精度很低，是否有适合not ...

唔識唔好獻醜啦。
玩好聲，notebook 角色係做介面only，SSD 經usb 比外置cas 一定EMI 最少。

仲用音效卡。落伍了。慢慢聽noise 啦

alamakazam

天下第一刀 發表於 2012-12-19 10:09
I'm not sure the corsair ax1200i that is active  PFC and single  pulse-width
modulators and it's  ...

if we believe their noise measurement...
x7(test1) vs ax1200i(test 4)
12v          13.2mv        10mv
5v          5.6mv        5mv
3.3v          7.4mv        4mv
5vsb          8.6mv        7mv

ax1200i is better than x7


if we believe in their own technology... is our own choice, and u do have a good point... well I am not so good in power supply



http://www.pcper.com/reviews/Cas ... y-Review/Under-Hood

alamakazam

ilccmcf 發表於 2012-12-19 13:29
唔識唔好獻醜啦。
玩好聲，notebook 角色係做介面only，SSD 經usb 比外置cas 一定EMI 最少。

no, use esata SSD with linear power supply

天下第一刀

ilccmcf 發表於 2012-12-19 13:29
唔識唔好獻醜啦。
玩好聲，notebook 角色係做介面only，SSD 經usb 比外置cas 一定EMI 最少。

如果用耳機聽﹐notebook的確很干淨﹐跟３０美元左右的ＵＳＢ音盒的聽感沒有分別﹔
３０美元左右的ＤＡＣ跟３００美元的ＤＡＣ音質比較各有千秋﹐
問題出現在保真度上﹕
１　你熟悉的歌手的人聲是否能分辨﹖
notebook﹑３０美元左右的ＤＡＣ﹑ＩＰＨＯＮＥ等播放44.1KHZ的音樂文件時﹐本
人就無法分辨系那個歌手唱。時鐘問題而已。
新的臺式電腦主板已用兩個時鐘。
２　臺式電腦用專業的音效卡外接ＤＡＣ播放也是時鐘問題而已﹐即播放高速度是
否精確而已﹐即３３轉錄制的ＬＰ用34轉或33播放的分別

３　SSD 經usb 也要經播放機器的內存緩沖。內存系音質的關鍵。

新的臺式電腦主板外接ＤＡＣ在揚聲系統上絕對秒殺notebook﹐到大陸的耳機論壇
看看如何﹖

但音響系給聽眾聽的﹐耳機作為個人聽而已﹐耳機在音質及保真度絕對秒殺任何同等級的揚聲器。

天下第一刀

alamakazam 發表於 2012-12-19 15:43
if we believe their noise measurement...
x7(test1) vs ax1200i(test 4)
12v          13.2mv        10mv

x7及 ax1200i等國貨未用過﹐在不知性能的情況下用外國名牌穩當﹐最少TURBO-COOL 1KW
SR用料十足﹐可惜長了兩英寸。