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樓主: kk_ho

夏季 DAC 原理和製作班 (AD1955) 5-SEP

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 樓主| kk_ho 發表於 2008-9-23 14:46:34 | 顯示全部樓層
Agree that seem why SONY use large R-CORE.
Sony use R-50 R-CORE for CDP-X5000

Also we use dedicated Analog power supply (R-30 R-CORE) for the DAC.

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autumnleaf 發表於 2008-9-23 15:14:48 | 顯示全部樓層
Is this your machine?
autumnleaf 發表於 2008-9-23 18:54:01 | 顯示全部樓層
KK sir,

I am using default plan in DAC1955, may I know the default transformer spec now? how many secondary windings?
autumnleaf 發表於 2008-9-23 19:01:56 | 顯示全部樓層
And also what is the size of the default transformer? Is it toroid?
 樓主| kk_ho 發表於 2008-9-23 20:35:35 | 顯示全部樓層
It is one of my CD player in my home.

My gear :

SCD-1
SCD-XA777ES
CDP-XA50ES
XL-Z999 (Victor)
XL-V1 (Victor)
CDP-X5000
CDP-X3000
DCD-2560 (Denon)
autumnleaf 發表於 2008-9-23 20:39:20 | 顯示全部樓層
Then what amp, what speaker? do you play LP?
 樓主| kk_ho 發表於 2008-9-23 20:39:28 | 顯示全部樓層
It is a 95VA toroidal transformer.

The detail will be show to you at the assemble class.
autumnleaf 發表於 2008-9-25 22:32:34 | 顯示全部樓層
我果塊DAC1955底板有少少彎, 我至今未焊through hole料, 辛苦咁耐撲完零件, 今晚焊SMD料時, 塊PCB平放玻璃上睇, 而家發現成塊板向一邊角慢慢彎起有2mm高, 我相信冇問題, 但係大家有冇注意到? 之前我塊PCB放書架上.
 樓主| kk_ho 發表於 2008-9-26 23:18:45 | 顯示全部樓層
Speakers:

Victor SX-500 Spirit
Victor SX-100
Clone ProAC1SC +
KEF Reference 201mod
KEF Reference 100 Center
KEF 70S Rear speaker
KEF 1005 T Sub woofer + 5 Sat speakers for Presence speaker

Amplifier:
Tripath T2020
TI TAS 300W Class D
UCD 100
UCD 180
UCD 400+
UCD 700+
Denon 3600 AVR (1992)
Victor AX-V808GM  (1991)
Victor AX-S9 Int amp (1992)
Marantz AV9000 Preamp mod + Marantz MM9000 mod (2002)
Denon AVC-A1XV (2006)
Yamaha DSP-Z11 (2008)
autumnleaf 發表於 2008-9-27 04:44:26 | 顯示全部樓層
一遍amp海 !  有冇位坐
 樓主| kk_ho 發表於 2008-10-2 01:28:42 | 顯示全部樓層
AD1955 DAC PSU test result:

Power supply test only : (PASS, 2-Oct Updated)
Ronald
Kelvin Tai
R Lam
Geneltd
Joepet
Tony
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