t.kaiming 發表於 2010-11-8 22:20:04

原創CD機 A8-S

我想摩原創A8s CDP的Op Amp (OPA604AP & NE5532AN) ,
OPA627BP可以直代它們嗎? 多謝!

kk_ho 發表於 2010-11-8 22:44:02

t.kaiming,

For me.....

1. Upgrade upsampling module before signal to PCM1732.
(we have 24bits/96KHz upsampling provide)

2. Change 4 E-cap from Elna MUSE to Blackgate. Also that 2 large 3300uF.

3. Low pass filter capacitor --> Silver Mica

4. Op-amp --> NS LME49710.(more musical than OPA627).
You can soldering a socket inside of PCB, we have OPA627BP and LME49710, you can AB comparision.

5. Resistor --> Dale or RMG depends on your budget. But sure is not using the cheap cheap default resistor.

http://www.hififever.com/discuz/attachments/phpbbfile/sany0754_195.jpg

t.kaiming 發表於 2010-11-10 22:36:26

thank you! kk sir
即係可以代替OPA604AP同NE5532AN嗎?

kk_ho 發表於 2010-11-11 01:55:25

OPA604 --> Single OP-AMP

NE5532 --> Dual Op-amp

LME49710 --> Single op-amp.

LME49720 --> Dual op-amp.

t.kaiming 發表於 2010-11-11 19:18:45

咁 OPA627BP 係 Single 定 Dual ?

kk_ho 發表於 2010-11-11 19:28:44

OPA627 SINGLE

記往試埋LME49710

t.kaiming 發表於 2010-11-12 22:19:50

如果Single OPA 用在 Dual OPA 度, 係唔係要加adapter?

kk_ho 發表於 2010-11-12 23:39:33

YES

t.kaiming 發表於 2010-11-13 23:03:08

LME49710 , LME49720 貴唔貴?

kk_ho 發表於 2010-11-14 01:22:52

Cheaper than OPA627.

You can soldering the IC socket and take your machine to hififever to do a AB comparision test.

t.kaiming 發表於 2010-11-16 12:48:26

加咗個鍍金IC座:lol

kk_ho 發表於 2010-11-16 12:51:21

Good, you can take your machine to hififever (suggest at coming SAT), I can demo the diff of OPA627 and LME49710 to you.

Also, we have ELNA Silmic II, Nichicon KZ, Sanyo OS-CON, Nover capacitor in stock for your modification.

Please confirm you can come this SAT or not.

t.kaiming 發表於 2010-11-22 22:10:49

sorry! 嚟唔到, 我已買咗OPA同caps嚟犘:lol

jastudio 發表於 2010-12-6 15:50:04

刚刚拿到 49710。。。 好正。。。
数据没有627好， 但一听好像更平衡，更有音乐感。。。

t.kaiming 發表於 2010-12-11 19:03:19

嘩宜家暫時換咗WIMA電容DALE電阻同兩粒OPA627以有好大改善 遲D咪:lol

kk_ho 發表於 2010-12-17 16:49:05

本帖最後由 kk_ho 於 2010-12-17 17:06 編輯

For me, I perfer use SILVER MICA for output buffer, and low pass filter stage..

t.kaiming 發表於 2011-1-9 17:00:57

silver mica 貴唔貴? 同係邊幾粒呀?

kk_ho 發表於 2011-1-9 19:22:53

你告訴我參數，我報价俾你。
還有，有訂造R-CORE牛供應。
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