CDM12.4

人家砌了,聲音麻麻
小弟今天睇過,原來該線路有"北"的

1'st re-construct the SPDIF buffer.
Same lot, same date code, from same wafer cutting. 74HC04 "Selected".
吾係做零件買賣, 很難入到相同wafer貨

My photo is capture by 818Pro, too poor, sorry.


未完, 夠五百個 hit rate 觀看再續


KK

Hi KK Sir,

Would like to know more abt "原來該線路有"北"的".
What kind of this "bug" in circuit!

I will post again when hit rate = 500. and phone to you at tonight about the bug first.

KK

Hi KK Sir,
我最近也完成組裝上述轉盤,
很想了解--"原來該線路有"北"的"
How to re-construct the SPDIF buffer.

Poshming,

Could you mind let me know where of you to purchase this kit ?

We are not selling that KIT right now.

For this post, the user take this and ask me independly.
And he get a damage laser head from that kit.
Many issue need to fix for this customer.

Anyway, I will help you.

KK.Ho

KK Sir,

I bought the kit from http://www.hifidiy.net

poshming

Poshming,

Please post some photo over here, and let me take a look first.

Thanks
KK.Ho

很想了解--"原來該線路有"北"的"

Need 500 hit rate.


Please wait around 3 day, I think can over 500 hit after 3 days.

***我的CDM12轉盤(12月團購標準板)

Inside look, please

BXX,

Help me bought the laser head la,

Please call me

KK.

***我的CDM12轉盤(12月團購標準板)
inside look

Poshming,

下星期我會攪個部北機
Laser head have problem too ....
密切留意我Ｄ相

KK.Ho

kk sir,

你好! 我在上次 cd 摩改班時己聽過 Mr.Ben 搭18層的聲音,人聲的實在感及

音塲深闊,很是曰味, 我在cny亦收到玩具 hifidiy cdm12 盤 亦己装成功,但聲音太

薄不實, 可有改善方案?

luk,

I said that before, the design have "BUG".

Can solve.

May I know where of the kit you are purchasing ?

Did you get the datasheet and application note from there?

We have reference design of CD-7, CD-10, CD-10II, and the source code and low level driver.

Once you have this tools, you can change "ANY" function register in the chip, User interface, etc.

BTW, we will arrange a "HifiDIY CDM12.4" re-work workshop soon.
Please pay attention of our notice.

KK.Ho
93067521
kk_ho@hififever.com

500 hit rate get.

As I promised.

All high hand, see the picture.
What is the output stage and buffer use inside the IC ?

This is the first step.

And may I know how many people have this machine ?
And how many want to upgrade it ?
Not mod the clock, not the cap, no R, etc......

計我話舊 chipset, SAA7324, SAA7327 年代最好, bug 最小
整合度無 SAA7824高, 出SAA7824 是因為飛記當年.......2000年有單野....

KK.Ho

have a kook :twisted:
http://www.cndiyclub.com/bbs/read.php?tid=12829

他的方法是對的, 以前我係廠機都見過
查看datasheet, 原來.....高手高手

吾知佢post張 blcok diagram 有什么玄機呢

You can parallel, please take a look of this web, which tell you more secret thing about SDPIF.

http://www.epanorama.net/documents/audio/spdif.html

傻人改機 :
I don't think so, please read the above link, try to use 3-4 minutes to understanding the details, and 吳國敬 post about the internal circuit of 74HC04, if you have study the semiconductors manufacturing subject in univeristy before, you will see that picture and will get what meaning is. For the beginner diyer, you also can see this in some circuit, try to take a wide checking in our web, we have post before.
When you take a look of all material, you will know who is 傻人.

Most of the China Forum style is follow the answer of the reply from the first reply people.


這樣大量重疊並聯，大量接點、接線，jitter不用理會嗎
We put the logic as close as possible, try to make it shorter as possible.
jitter不用理會嗎
If all logic gate are indential spec. (i.e. Turn-ON-OFF) time will be the same)
For this kind of application, can be ignore.
Since T= T1 + T(n)!  and n=zero.

We change to techincal point of view.
I have prepare few question to new Diyer people to study about this case ?

1. Why need to parallel ? (Ans when hit rate =1000)
2. What is the advantage? (Ans when hit rate = 1100)
3. What is the dis-advantage ? (Ans when hit rate = 1200)
4. What is the waveform looking ? Before and After ? (VERY IMPORTANT)
(Ans when hit rate = 1500)
5. How many QTY is enough ?
(Ans when hit rate = 1600)

And take a look here :

http://www.hififever.com/forum/viewtopic.php?t=1257

KK.Ho

All Diyer beginner,

Please found the attached document for the reason of parallel the logic gate.

Page 21: Ron (Delay analysis, ans most question the important timing on switch on/off)

Page 37: Why parallel

Page 60 : Transient response

Page 62 : Leadage, Clock...

This document is reference to :

Dr. Angus Wu
B.S.E.E. (summa cum laude), M.Sc., The Ohio State University  
Ph.D., Washington State University , MIEEE

Deputy Director, EDA Centre
CITY University, Hong Kong

差點兒遺忘了的Digital Electronics。回想起從前做ASIC設計的日子。原來不知不覺已經武功全失

cndiyclub有大量回覆

其中有

他們自圓其說，為自己所做的事封好後路，怕給人說他的缺點
說甚麼有好多朋友，網友在做關於零件買賣
所以他們才能拿到同wafer的零件，簡直廢話連編！！！
同批號、同期號就當成同一片wafer
好，我當真的是同批號、同期號、同一片wafer
誰都可以買到啦！！同批號、同期號有多難呀！！零件又不會寫下是出自那片wafer
他們說甚麼都可以啦

終於明白甚麼是 JS

而且看到他們選件用甚麼廠、垃圾說不上
但好的他們卻沒有
有本事用MOT記玩玩

那些接線、焊點，真的.........

而且
同一片wafer就是等於配對
那PASS的管就不用配對啦

有本事用MOT記玩玩

We don't have MOT.

Do you mean Motorola ?

Motorola spint off to two semiconductors co.
ON-SEMI and FreeScale.

Best Regards,
KK.Ho

他們自圓其說，為自己所做的事封好後路，怕給人說他的缺點
說甚麼有好多朋友，網友在做關於零件買賣
所以他們才能拿到同wafer的零件，簡直廢話連編！！！
同批號、同期號就當成同一片wafer
好，我當真的是同批號、同期號、同一片wafer
誰都可以買到啦！！同批號、同期號有多難呀！！零件又不會寫下是出自那片wafer
他們說甚麼都可以啦

Please goto market to buy the TI chip and we compare the different.
That's all.

而且看到他們選件用甚麼廠、垃圾說不上
但好的他們卻沒有

Could you mind let me know who is the first 3 top logic supplier in the market ?
How much of 1M pcs ?
Run Rate ?
Which part no is on allocation ?

接線、焊點，真的.........

Please post how to connect by using your method, that let other diyer to learn.

而且
同一片wafer就是等於配對

we try to find out a "close" characteristic.
According to the experience, same lot on wafer can be more close more than 1 year later or above.

那PASS的管就不用配對啦

Ha ha, you get the meaning why need to parallel la.
Sure, need to parallel.
For a single mosfet, you can simple to finding the matching pair as you need to know the method. I think you will know....

KK.HO

而且看到他們選件用甚麼廠、垃圾說不上
但好的他們卻沒有
有本事用MOT記玩玩

We choose TI, because we get the sample from TI.
You can simple use difference manufacturer brand, like TI, NXP, Fairchild, etc. to check which one have better sound and spec.

中文版

上面已答過
因Sample 先從TI取, 咪用TI先羅
如果想試邊隻 LOGIC 好聲, 有很多牌子選的
不要把重點放在LOGIC 牌子身上
比個貼士過你, 輸出那隻交連牛的輸入跟果秋 "logic"數量有關係架
交連牛的輸入 : 不是用簡單的 "他表" 所量度
有架生度的, 仲要計數
現在的軟件好勁, 好準

I LOVE MATLAB (not MathCAD)

得閒來找我, 我帶你參觀EDA Lab(只限開放日)

KK.Ho

Hi KK Sir,

M/B u r quite busy & not in HK as well, could u call me bk when u r ok.
Tks!

bbleung,

Take your CDP to hififever office at Monday night (before 8:00pm)

I will fix it and return to you at coming SUN.

KK.

Sorry for latest reply.
Hard work on SAT and SUN

Wow, such a man! Tks again for yr kindness.

Hi KK sir,

Want to discuss something on phone, can call u tonight or pls call me bk tonight at any time! Thank you!

I have the CP-ROM of which I bought from China. Interested to know the problem and interest to know how to improve it. DO not really like the result. After reading the diagram, I still do not know what is the problem, May be I am not on the digital domain, can KK explain it in more details. Thanks.

accphoto,

Give you some hints.


Packet, data, clock, LR-Latch
MP3
Compression...
Lossless compression...
Market....

Any idea?

KK.Ho

Unfortunately, my digital knowledge is so so ..... anyway, if there is a course to modify the CDM 12, I will certainly the first one consider to join.

78.7%

Version K featuring with "CRAZYMAT" module.

咦！K 版？  乜野係"Crazymat" Module！

K version =  Signature version.
CrazyMat module = please register and come to this Sun, you will know.

K.K.Ho

Hi, aldy reg but not sure its cfmed or not.

KK Sir, is it possible to pick up the stuff by tomrw at HiFiFever office?

Hi KK, sorry for disturbing cos i can't remove the screw which lock the metal rod from the base, do u hv any suggestion that can loosen the screw since i don't hv this kind of key!
[img][/img]

Take it to me.

KK.

Hi KK, when can it be most conv. so can take it to you!

when can cmd12.4 launch the course?
can we buy the kit set?

Paul,

Please come to 7-Apr show, we have Ver.K of this transport.

KK.

KK,

Can i confirm that the bug come from 74HC04 instead of SAA7824. I just look at the CD-ROm today, they are using SAA7327.

Thanks.

Since SAA7324, that bug happen.

No worry, it can solve.

Please come to see our method at 7-Apr.

We have dedicated engineer(not me) to describe how to solve it.

KK.Ho

KK,

Any chance to talk to you regarding the CDM12 CD player modification since I 've missed the lesson in March.

Silva

Silva,

Any chance to talk to you regarding the CDM12 CD player modification since I 've missed the lesson in March.

We have CD workshop in March but the teaching topic is not mention for CDM12 ?

..............Another shop ?

Anyway, what problem did you have ?

KK.

KK,

Sorry for the late reply since I was out of HK for a week.

My CDM12 works fine. What I want to know is how to fix / upgrade the CDM12 so that it can sound even better or ... becoming perfect.

This is what DIYERs doing all the time.... never ending !

Silva,

That bug cannot be solve, need to ask NXP about this.

But you can use "another way" to solve it.

Please wait our solution at next month.

KK.Sir.

Dear KK,

Will wait for your " Alternate way ".

However, can you explain what is the bug of CS8240 and your idea of fixing the bug ?

Silva

Please take a photo inside of your CDM-12 which have this IC CS8240, I want to know.

Please locate this IC, I did not find this in the unit