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)

Hi, I just enrolled to this course and just paid by PayPal. Please check and confirm. Thanks

henry168  thx for joining

Joe6 thx for joining

autumnleafcat, thx for joining

One chassics include Loader and DAC :

Only 1 solution :

CDM9 / CD-Pro 2 + DAC 7 (TDA1547 DAC)

AD1955 impossible.

TDA1541A, it can, but space is limit. Need to review again.

So I would consider two chassis solution. Not too bad anyway.

GOFFIC, thx for joining

Dear William,

Just paid the deposit. I would like to join the DAC1955 with black case.


Regards,


Raphael

angusha, thx for joining

I have already deposit the money. Please check.

Can i hear the different between 3 DAC before I choose?

gene thx for joining

gene, good idea...

可以聽後決定嗎?
現在我都未決定到,選A定C好?
好似好多人選ＡＤ１９５５,為何呢？
１５４１唔及１９５５？
其實邊款好的？

無人回.........
為有跟大隊,就AD1955 :wink:

All of the 3 kinds of DAC have different character.

If I were you, making 3 of all la.

You may say I earn too much.............. NO.

You can join the most difficult / complex of AD1955 first.

After that, you can easy to make 1547 and 1541 at your home.

We can offer KIT to you. (special price only for AD1955 classmate)

Sure, you need to drill some holes (not more than 10) in HF before you take the KIT to home.

KK

Dear KK Sir.

好!
就呢個明言!呢一刻我就選AD1955先,請幫我告知William hing.
DIY條路真係好長~

thanks!
Dyna

~福利MG GUNDAM2.0坐地起買10% ~
$29X~頂!

Dyna,

Yes, you can do the TDA1547, 1541 at home sure.

For drilling the alum case, you can mark the basic hole and do it at HF when you take the KIT.

I bought MG2.0 at early stage, $265.

KK

Thanks, then i choose 1955. Will the DIY very complex to do? I just made some electronic toy 10 yrs ago.  :roll: I am worried... By the way , is there any photo of the DAC?

Dear KK Sir,

I've rescheduled my business matter and can join in the class on Sept but do you still have a room for "套件2 : Analog Device AD1955 TRUE Balance output" ? I'm a bit late but please inform me if still have a room availalbe and I can make deposit immediately, sorry for any inconvenience caused.

Thanks

Sugar,

OK, have seat.

Please send email to admin@hififever.com to confirm again.

Dear KK Sir,

I've made the payment through Paypall today already, Receipt ID: 7M933252UT3014938

Thanks

sugargar, thx for joining!

Dear KK Sir,

Want to ask is there any upgrade options available and can be provided by hififever for 套件2 : AD1955 DAC,  e.g. upgrade capacitor to "Blackgate" or other component upgrade?

Thanks

I will join for DAC 1955 Balance.
Thanks :

How about the I2S clock output module from DAC1955 board to CDPRO2.

tai chi, thx for joining

Autumnleafcat,

It should be IIS input module for CD-PRO2 IIS output


OR

IIS output module for normal CD player

KK

滿額, 下回請早....


NEXT ROUND.............NOV ?  OK ?

I've listened to Meridian G08.2 in Central Hifi Galaxy. The New 8.2 has stunning details while maintains suitable bodyline texture of instrunments. Bass and high frequency extremes are widely extended. I think I have to try hard on the DAC1955/CDPRO2 combo to beat this newly release machine on both musicality and fidelity.

Dear admin / KK sir

Will the DAC course be held on schedule?

Pls let me know .

Thanks
Dyna

Dyna,

See you tomorrow.

Admin will send the email to everybody at tonight.

KK sir .

See you tomorrow~

Thanks
Dyna

KK Sir, what kind of file format is supported by the usb input of 1955 DAC? Is APE support? If yes, I want to add it in my DAC. By the way, do you have any balance cable (finished) for sales?

KK sir,

I'm using Cambridge Audio 640C V2, can it support 11.2896MHz?


Sugargar

You can trust the USB CODEC as a speaker.

The player is the PC, you need to install the SW which can playback the APE file.

All of the sound information will be pass through to USB codec.

When you plug the USB CODEC into the PC, your sound device (sound card / onboard sound) will be disable.

The USB codec will transform the USB audio steam into IIS signal.

KK

See below:

如果使用I2S连接，那么转盘与解码器的时钟就要一致，这样才能同步.
由于AD1955不支持192fs、384fs等时钟，因此CDPro2与DAC1955PRO不能使用I2S连接，只能使用S/PDIF来连接了。

only support 256fs, 512fs, 768fs

192fs = 192x44100 = 8,467,200

256fs = 256 x 44100 = 11,289,600

384fs = 384 x 44100 = 16,934,000

512fs = 512 x 44100 = 22,579,200

768fs = 768 x 44100 = 33,868,800

11.2896MHz machine check list
http://www.lcaudio.com/index.php?page=39

KK Sir,

As my 640C player not on the support list, you mean I need to mod my CD player? and install the USB device which you've shown us yesterday into the 1955 DAC? to achieve" 用S/PDIF来连接 >>  转盘与解码器的时钟就要一致，这样才能同步"?

If the answer is yes, that means I need to attaned the CDP mod class later or I better build a HTPC to achieve "转盘与解码器的时钟就要一致"?

Sugargar

kk Sir

我想問加個USB codec 容易嗎?(同價錢方面....)
同已知cdm9同pro2一樣不能使用I2S連接,但我部cdm9應用那方法連接？同支持那個數位fs？(Setting方面可否在課堂上指導指導？）

THanks !
Dyna

Hi KK Sir,

     Personally, I think the course is running a bit too fast. And the course material is not detailed enough. I just cannot absorb all the materials just seeing your Power Point flashing on the screen. It'd be better if you can do it a bit slower. Would you please email us the notes before the class or delivery the hardcopy to us during the class, and it will make life easier. Thanks.
     
MAKCW

KK Sir,

I'm building 1955 DAC and want to know the price of upgrading to Plan A with OPA797x4, OPA627x4,OPA2604x2, (4.7uf x 4pcs good capacitors around $500), USB module and without all other capacitors.

Thanks

As my 640C player not on the support list, you mean I need to mod my CD player?

// It cannot solve the problem, if your CDP core frequency is not 11.28896MHz.

and install the USB device which you've shown us yesterday into the 1955 DAC?

// The PCM2706/7 is 256fs. so the IC can solve this issue.

to achieve" 用S/PDIF来连接 >>  转盘与解码器的时钟就要一致，这样才能同步"?
// AD1955 DAC KIT can support SPDIF. If the input is SPDIF format, no need to care the clock frequency in your CDP.

If the answer is yes, that means I need to attaned the CDP mod class later or I better build a HTPC to achieve "转盘与解码器的时钟就要一致"?

// The above ans can let you have your decision.

KK

我想問加個USB codec 容易嗎?

// Easy, soldering 4 wire in, 4 wire out. 2 wire for 9V power. 4 wire for USB input

(同價錢方面....)　

// hope to be below $250.

同已知cdm9同pro2一樣不能使用I2S連接,但我部cdm9應用那方法連接？同支持那個數位fs？(Setting方面可否在課堂上指導指導？）

// SPDIF.

Personally, I think the course is running a bit too fast.

// Yes, agree. I need to pack 3 DAC into a single class, also tell 3 kind of people for the circuit, up-grade. Therefore, I simple introduce 5 major basic block at very beginning which must have it in DAC.
DIR, Digital Filter, DAC, LPF and Output buffer.

I am believe I am teaching their function in the course. But some of the protocol definition such as IIS, Oversampling, filter characteristic is skip.


And the course material is not detailed enough. I just cannot absorb all the materials just seeing your Power Point flashing on the screen. It'd be better if you can do it a bit slower.

// Agree, but only 1 night (if pure 3 hour) is also cannot teach you everything for whole DAC. I can teach you only DIR parts at 3 hour. But believe most of the technical terms is hard to understand. I do this at last DAC course and CD modifcation class let make people sleeping. Also, I need to balance the level inside the class. I don't know all of 15 people in class, so a very simple block teaching is choose.

Would you please email us the notes before the class or delivery the hardcopy to us during the class, and it will make life easier. Thanks.
     
// I will have a single class (special class) at coming week (mon-Fri) nights.
Say 7:30pm-11:00pm only. Which teaching the theory only. And Q&A.
A pure DAC theory class for DAC class people.
, after that, I will cancel the teaching at other coming 3 course.
My original plan is :
Night 1 : Simple introduction, 3 type of DAC circuit analysis.
Day 2 : Function of each 5 block. Detail operation of TDA1541A, 47 DAC
Day 3 : Function of each 5 block (cont). Detail operation of AD1955 DAC
Day 4 : Advance modfication tips.

Please let me know what you want ? Also for the classmate.

sugargar

I'm building 1955 DAC and want to know the price of upgrading to Plan A with OPA797x4, OPA627x4,OPA2604x2, (4.7uf x 4pcs good capacitors around $500), USB module and without all other capacitors.

// The OPA797, OPA627, and OPA2604 will first to reserve for complete plan A and Plan B user.
I am reserve the LEAD type Op-amp for Plan A, B user first. (also for future DAC class).
Please contact admin@hififever.com to get this special quote. I am not sure the result is good.

// Some good capacitors also inside a capacitor, this is what I found in the DIY market.

// USB module is around $250. KIT only.
Please note: I only have 10set on hand now.


KK

KK Sir,

Please reserve one USB module to me 1st, waiting admin reply on special quote.  

I have a question about the voltage of cap on power filtering part in AD1955 which you have suggested on last night:
1) 4700-6800uf better use 35v+
2) 2200-4700uf better use 25v+
3) 2200uf better use 25v+

If I use blackgate STD cap on the above slot, the voltage of cap in blackgate STD cap stock list is only 16V, if I use the following STD cap on power filtering slot, 16V voltage enough?
1) 4700uf,16V x 2
2) 3300uf,16v x 3
3) 2200uf,16v x 1

In additon, if I use (Blackgate FK) 100uf,16V x 8 in the PCB slot, is 16V enough?

Need some advice


I want to join the (special class) at coming week (mon-Fri) nights, please let me know the exact date. In additon, I want to buy the digital meter $2xx which you shown us yesterday because my tiny meter seems not work, will pickup at the special class.

Thanks

Sugargar

Sugargar and all,

Please contact Admin for USB module issue, we reserve by first deposit first serve.

1) 4700-6800uf better use 35v+ (Yes)
2) 2200-4700uf better use 25v+ (Yes)
3) 2200uf better use 25v+ (Yes)

If I use blackgate STD cap on the above slot, the voltage of cap in blackgate STD cap stock list is only 16V, if I use the following STD cap on power filtering slot, 16V voltage enough?  

// SURE NOT ENOUGH. Don't use 16V rating, I will not test it unless you change to the voltage rating of the capacitor to recommended value.

1) 4700uf,16V x 2
2) 3300uf,16v x 3
3) 2200uf,16v x 1

In additon, if I use (Blackgate FK) 100uf,16V x 8 in the PCB slot, is 16V enough?

I want to join the (special class) at coming week (mon-Fri) nights,

// It should not be call special class, I put the coming 3 class early into this day. But I need to get a confirm by remain 14 person (total 15 person in class). If all of the classmate agree to have this arrangement, I am no problem.

I want to buy the digital meter $2xx which you shown us yesterday because my tiny meter seems not work, will pickup at the special class.

// Same as USB module issue. Limited stock at HF office, first deposit first serve.

KK.HO

Sugargar[/quote]

Deposit in class? Paypal?

KK Sir,

As many 1955 DAC students like me cannot design which upgrade plan is best for us, can you post or send the default parts list and upgrade Plan A & B?  so we can compare and make our desicion faster and easier.

Thanks

Sugargar

Hi KK Sir,

     Good to know that there will be a special class for pure DAC Theory this week. I would like to learn more materials on the topology behind good DAC design instead of practical soldering and assembly skills. Please kindly inform me the time and date when it is fixed.

     Regarding the teaching materials, I think it will be great if you can follow closely on the materials as listed inside the course outline. Maybe I am lost as no course notes will be delivered, it seems to me that the following parts have been skipped.

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)
10. 怎樣調較接收晶片?
11. DIY Layout Tips
12. Analog部份LPF和膽輸出討論
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.

     Regarding the 5 blocks you mentioned so far, DIR, Digital Filter, DAC, LPF and Output buffer. May I ask why we need a LPF? What make a good LPF? What is the purpose of an Output buffer? Why not output the signal directly to next stage?

     Thank you for your help.

MAKCW