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)

KK Sir,

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

Sugargar

Finished.

not yet finished!

Cat and all,

Do anybody not finish yet ?

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

Many thanks to KK sir.

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

Don't worry on time and less pressure.

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

KK Sir,

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

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

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.

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

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.

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....

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.

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

Need to prepare how much $ ar?

Sugargar

kk sir.

大约幾多錢?唔會太貴嗎?
現在五行欠金~

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.

[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

Dyna,

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

THX

I interest in listening sound of plan C ...

Still in prepare the components.

Will put SRC4192 on daugther board.

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.

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

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

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

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

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.

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.

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....

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

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

SPDIF input

USB module

6 wire connection.

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.

PLL RC value need to adjust for 192?

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?

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

USB module.