2008 7月-12月 第1項課程召集 - (1) 夏季 DAC 原理和製作班 (10月11日繼續組裝)

滿額, 下回請早....

HiFi Fever 從2008年開始會以召集型式開設工作坊, 砌機課程等等得到各音響發燒友大力支持 (差不多全部滿座), 我們在下半年會再度改良課程內容, 希望更切合大家的要求..

召集課程最先達到最少報名人數要求的便先行開班! 大家留名時亦可說出自己的特別要求, 我們會儘量配合!

2008 7月-12月 第一項課程召集 - 夏季 DAC 原理和製作班

DAC 課程包括套件: TDA1547, DAC1955, Tube buffer 等等

名額: 每班最少8名最多12名

課程內會教你 :
1. DAC 基本原理
2. DIY DAC 的 Tips
3. DAC 晶片的發展 (由1986至今), 不同品牌的特性
4. 怎樣在CS8414 Re-Clock?
5. CS8414 外的其他選擇
6. Non oversampling VS Oversampling, 那個較好?
7. SRC (Sampling rate converter)
8. TDA1541 的電源部份重要嗎? 為什麼?
9. 怎樣調較TDA1541? Un-documented application note.
10. 怎樣調較接收晶片?
11. DIY Layout Tips
12. Analog部份LPF和膽輸出討論
13. 怎樣最佳化各部份的零件
14. Upgrade Tips (五大類)
15. 安裝Tips
16. 測量和改善
17. 真Balance輸出的做法 (不是用opamp +/- 輸出的假Balance), 首次在DIY市場上出現.

日期:
5/Sep (Fri) 7:30pm-10:00pm (理論, 試機, 認識零件)
20/Sep (Sat) 2:30pm-8:00pm (組裝)

套件1 : TDA1547 DAC7High-end DAC
包括: 1547 DAC PCB, 中檔零件, 高級R型變壓器, 小型機箱
價格: $1980, TBA 包套件和課程 (先付$500訂金, 尾數第一堂付清)

Featuring:
Small form factor size of PCB.
2 SMD device, SAA7350 and SM5842 + TDA1547.
是Clone STUDER的D731的 DAC 7部分circuit
高频部分就采用Mark_Levinson耦合circuit


套件2 : Analog Device AD1955 TRUE Balance output High-end DAC
Coaxial In, Optical In, IIS In. PCB size like a ATX motherboard
包括: DAC PCB, 中檔零件, 變壓器, 大機箱
價格: $3480 包套件和課程 (先付$500訂金, 尾數第一堂付清)



報名: http://shop.hififever.com/product_info.php?products_id=301

地點: 荃灣沙咀道29-35號科技中心9樓910室
Map: http://www.hififever.com/forum/files/thumbs/t_map1_184.jpg

己報名(*=已收費)
TonyWang* (1547)
Dyna* (DAC1955)
mat_tli* (TBD)
MAKCW* (1541MK3)
rting (?)
henry168* (DAC1955)
autumnleafcat* (DAC1955)
Joe6* (DAC1955)
GOFFIC* (DAC1955)
Raphael* (DAC1955)
angusha* (DAC1955)
gene*  (DAC1955)
sugargar* (DAC1955)
tai chi* (TBD)
cy (DAC1955)

USB module.

1. For Bal config, it need more components.

2. When using Bal config. Simple connect +VE and GND --> Unbalance output.

3. When you need Bal out, connect +VE, -VE, GND to XLR.

4. You cannot use un-balance to be a balance.

5. The function of LPF are same.

THX.ISF

KK Sir, I have a question:

The config of Our 1955 board is 平衡的結構  
What is the different between RCA and balance 輸出? Is the balance 輸出 better than that of RCA 輸出? Is our current config optimise for balance 輸出?

If a person only use RCA 輸出, then there is no need to set 平衡結構? And then 改為非平衡的結構，拆掉R404/R432/R430/R431，R504/R532/R530/R531，補上R422/R423/C421，R522/R523/C521，並修改部分電阻電容的數值?


I am interested in the TCXO module. What is the price of  TCXO module?

PLL RC value need to adjust for 192?

I am believe DIR9001 can "Overclock itself" to receive sampling rate up to 192KHz.

Let me try some day and tunning something.

To disable the PLL mode in DIR9001 (by connect a fix 24.576MHz) to DIR9001 and set it to non-PLL mode. It may OK.

But it will only support 192KHz, 96KHz and 48KHz input.

If at AUTO mode, I don't know DIR9001 will choose crystal base (24.576MHz or internal PLL), from datasheet say: it choose crystal base first, if the timing is not match, it will jump into PLL mode.

USB module

6 wire connection.

SPDIF input

The MCU is reading the sampling rate by 1/2 of MCK signal from DIR9001.

dir9001 can give 192k lock status indication to mcu in dac1955pro?

Final config:

CDM12.1 IIS --> SRC board.


Don't learn about the config, it is too dangerous to put a CDP over a DAC without the top plate.

You can compare CDM12.1 IIS in put VS SPDIF input from SONY CDPX5000 transport.

I would like to use CD-PRO2 IIS out to SRC board, but the classmate not finish yet....

SRC board + USB --> DAC 1955

Right hand side is USB board

SRC board IIS --> USB board IIS input (74HC157D),
74HC157D --> IIS input of DAC1955.
when no USB connect to PC, the output is from SRC board.
When USB connect to PC, it will output USB-IIS stream to DAC1955.

DAC 1955 can accept 176.4KHz input MAX.


Even the DIR9001 can only support 96KHz, but I tested today, it can "EAT" 176.4KHz SPDIF digital signal.

Please trust this is a "over spec" mode, we cannot gurantee all of you can do this.

Sure, you can test it by SRC input with your machine to know it can or not.

Sorry, we did not provide the special price about this.

TWO TCXO module reserve, first come first serve. That's all.

KK Sir,

Can provide a "金 融 海 嘯" special promotional price for upgrading from crystal to TCXO in the USB module? [-o<

Many Thanks

Sugargar

USB support mode (With AD1955 IIS input)

CD Source : 2008 AV show Track 5 : What are diff aday made

WAV (16bit / 44.1KHz) RIP by NERO --> Support (32MB size)
WAV (24bit / 44/1KHz) RIP by NERO --> Support  (48MB size)
Apple Loss Less RIP by ITUNE --> Support
MP3 (320kps) Rip by ITUNE --> Support.

You can compare 24BIT WAV file VS CD quality at coming SAT / SUN.

Sugargar, I think this arrangement will let you know Soundcard VS DAC quality.

You can bring your source (I am no CD-ROM drive) !!!


THX, ISF

DAC progress:

Macau Joe : OK, if you need USB, please let me know early.

Dyna, Chris : OK, USB module OK. You can choose Crystal / TCXO base($)

Angus : OK.

Henry Lam :
PSU : Test OK
AC mains socket broken : Solved. ($)
Dip 8 Opamp IC socket short pin 2,3 --> Solved ($)
Left channel output transistor pad damage --> Solved.
SMD device dry soldering --> Solved.
DAC not working --> In progress, please wait.

Still in prepare the components.

Will put SRC4192 on daugther board.

I interest in listening sound of plan C ...

Dyna,

It is a simple issue. I am assemble 4 set USB already, just plug and play 6 wire, you will compare instantly.

THX

[quote:e412813d8a="kk_ho"]Chris, Sugargar, Dyna, or other interest USB module friends,

Assemble 4 set.

One is same as Sugargar one, Crystal base (you can use it back)
One is using crystal
Two is using TCXO.

The result is.....................

Too terrible of TCXO VS Crystal.

You can come to listen at 2-Nov. Tell me what you finding about this.

You only install the USB module in chassics, all of the SMD job is done by me. Only 6 wire you are need to soldering on DAC, the wire should not over 4 inch. Safe and Excellent sound quality method.

Except that 3 man, we only have 2 available.

First come first serve.[/quote]

KK sir,

選擇上到時真的要比下意見~

THANKS!!!
DYNA

Chris, Sugargar, Dyna, or other interest USB module friends,

Assemble 4 set.

One is same as Sugargar one, Crystal base (you can use it back)
One is using crystal
Two is using TCXO.

The result is.....................

Too terrible of TCXO VS Crystal.

You can come to listen at 2-Nov. Tell me what you finding about this.

You only install the USB module in chassics, all of the SMD job is done by me. Only 6 wire you are need to soldering on DAC, the wire should not over 4 inch. Safe and Excellent sound quality method.

Except that 3 man, we only have 2 available.

First come first serve.

kk sir.

大约幾多錢?唔會太貴嗎?
現在五行欠金~

DYNA

Woo.........., thx KK sir

Need to prepare how much $ ar?

Sugargar

Dyna, Chris, Sugargar,

Got some Japan KDS 12MHz TCXO SMD type for USB module.

It is a Automotive grade device (wide range of temperature operation) and ultra reliable

Please prepare.........

See u.

Output capacitor test.

It is build in DC-SERVO, basically, it don't need o/p capacitor. Sometime, people would like to use it to tune "the sound taste"

We are prepare the following value for your test, no need soldering.

4.7uF, 10uF, 22uF, 33uF and 47uF.

ELNA GOLD Non-Polar series.

Please prepare some pretty cash at 2-NOV la....

A) Upgrade hints:
4. Silver Wire of MCK, DATA, BCK, LRCK will be a good result.

// You can compare the result by using IDE cable, Silver cable, and copper cable (LAN cable). Suggest you finish the board early and do this comparision early.

Q: Is it good enough if I use the silver wire (pink colour) attached on the USB module which last time you tested on my PCB board?

// You can consider LAN cable (copper wire) be a power supply cable. The total power consumption is less than 100mA.
No need too thick, pure copper is recommended.

B) Can I use back the USB module which you have assembled and tested on my PCB board last time? because I've used over 2 hours to solder the wire and tailor make the mounding.

// To be fair of another classmate, all of the Diyer should soldering their board by himself.

C) After your recent test:
Playback:
I am usign WMP11, any MP3 song, it show 44.1KHz in the LCD panel of AD1955. No need to set in PC.

Q: Do you think the quality of the MP3 song playback by AD1955 pro better than market $2k sound card?

// If you trust my founding, the performance will not let you disappear.
Suggest you carry your MP3 (put it at USB stick, I don't have CD-ROM). And test it by your ears.

Atleast, the power supply of DAC VS Soundcard. DAC must be better, also, Opamp is better than sounccard la.

KK sir,

Got some question on:

A) Upgrade hints:
4. Silver Wire of MCK, DATA, BCK, LRCK will be a good result.

Q: Is it good enough if I use the silver wire (pink colour) attached on the USB module which last time you tested on my PCB board?

B) Can I use back the USB module which you have assembled and tested on my PCB board last time? because I've used over 2 hours to solder the wire and tailor make the mounding.

C) After your recent test:
Playback:
I am usign WMP11, any MP3 song, it show 44.1KHz in the LCD panel of AD1955. No need to set in PC.

Q: Do you think the quality of the MP3 song playback by AD1955 pro better than market $2k sound card?

Sugargar

USB module connection diagram and Circuit diagram

1. Assume you will not IIS+External reclock

2. It can support IIS in by other external.

3. Connect (if need) your IIS device to the input of 74HC157D, pin label in PCB.

4. Connect the output of 74HC157D (which follow by 100R at o/p) to the IIS input of your DAC. You can connect the output to the port (near RJ45 port header). Connect them by label shown in PCB.

5. Connect 5V (from DAC board, digital or MCU area) to USB V+.

How to work ?

1. When USB is plug into your PC, the 74HC157D will output the data from USB device.

2. When no USB is plug in, it will output the IIS signal from your input port.

Upgrade hints:
1. The KIT come with OS-CON capacitor, no need to upgrade.
2. If you no need external IIS input, you can no need to solder the 74HC157D, direct output the data to IIS port on your AD1955 DAC. (RJ45 socket)
3. Using TCXO 12MHz instead of crystal. Or, 12MHz SMD oscillator will have a good result.
4. Silver Wire of MCK, DATA, BCK, LRCK will be a good result.

Playback:
I am usign WMP11, any MP3 song, it show 44.1KHz in the LCD panel of AD1955. No need to set in PC.

finished but not yet test wor. how can i pass the pcb to u for testing?

KK Sir,

If you have time, please check my PCB again since last Sat I did solder 5 resistance again.

10月11日才繼續上課組裝, 不要急, 最緊要做好些

完成焊接請電郵給我安排交收測試

Looking forward of everyone have well prepare and making a perfect machine.

Don't worry on time and less pressure.

Many thanks to KK sir.

Cat and all,

Do anybody not finish yet ?

I can give you more time.... Don't worry.

not yet finished!

Finished.

KK Sir,

Is the case with LCD display for 1955 Pro ready? Finished all soldering already.

Sugargar

It depends on

Need to check the classmate have finish the soldering or not.

KK Sir,

Do we have leson on this weekend?

Transformer is not simple.

interesting information

If ching wants to further reduce the leakage flux, one should use core belt wearing around the core. Core belt is made of highly magnetic conductive material to absorb stray field. However Core belt usually a custom built part to suit particular core. Therefore it is seldom use except certain product. You can cover the transformer by a steel/mu-metal can. But mu-metal does not sell in small quantity.

But flux band is only for reducing leakage magnetic flux from core. Certainly not 100%. For those who want to supress noise from power line, the transformer should add a faraday shield between primary and secondary winding. By connecting the faraday shield to ground. High frequency noise will capacitively couple to ground. The noise suppression is also not 100%. Adding a line filter can help a lot.

Looking inside flux band construction:

practical example of power transformer incorporating flux band.

Flux band concept:

Theory of flux band to reduce leakage flux in power transfromer:

We firmly wind one turn of copper foil (with its width slightly smaller than bobbin width) on the outside of the transformer core and perfectly short-circuited the foil. Since this one turn is not in the main flux path of the core (you can imagine the difference in winding geometry of primary, secondary and this copper-foil windings), it will not induce emf from flux inside the core because the resultant flux is zero for this one turn, so it will not affect normal tansformer operation.

Only the leakage flux from the transformer core will induce emf on this one turn. Since this single-turn copper foil has almost perfect zero impedance from both dc and ac sense (super low DC resistance and ultra low inductance, that's why use copper foil instead of wire), the short-circuited induced current in this copper foil has no power loss. By Lenz law, a magnetic field is generated from this single-turn to oppose the leakage field and thus giving us the leakage cancellation.

RTING,

The Digital Filter SM5842 did not support IIS input mode.

If you planning to make high end USB DAC, please wait our web announce later.

autumnleafcat,

Asking the transformer manufacturer last night, the shielding wire is shorted together (start winding short to end winding, one layer winding on top of the body).

Just same as your expected one.

KK.

Hi KK sir,
forgot to ask today, I'm making the 1547, is it possible to add USB in for
computer use?  any software driver needed for the computer?
thanks
ricky