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)

a. The 24 pins IC socket for SAA7220 is missing

// Will give u back.

     b. The four Op Amp NE5534 are missing

// Yes, will give you on the test.

     Secondly, I am thinking to add the tube buffer as the output for the TDA1541 MkIII kit. Please advise the pricing for the tube buffer kit.

// You need to change LARGE CASE because you need Tube amp buffer.
Admin will quote you a total price.

Hi KK Sir,

     I have been assembling the TDA1541 MkIII kit. I find the following parts missing:

     a. The 24 pins IC socket for SAA7220 is missing

     b. The four Op Amp NE5534 are missing

     Secondly, I am thinking to add the tube buffer as the output for the TDA1541 MkIII kit. Please advise the pricing for the tube buffer kit. Thanks.

MAKCW

All,

We have some Plan A and Plan B (not complete, but close) components at hififever.

First come first serve, see you 10:00AM for default, 2:30 for Plan A.

Remember bring Cheque or Money.

No EPS / VISA

Good luck.

Hi KK sir,

I am using default plan since I want to look for my dream component set myself. However it is really extremely hard to find all the components I desired in the market. Therefore I asked you and william for the upgrade plan late on yesterday. But William replied both upgrade plan A and B were not complete right now (some missing parts in both plans) because I was too late to request.

"Both heads cannot reach the shores", "兩頭唔到岸", 好慘! 頭髮白晒!

I think I cannot complete soldering my dac before Monday. 仲撲緊零件

BUT I would come on SEPT 15 to look at you testing for other c chings. I think I have no problem testing mine at home since in fact I have built several dac before: (3623, 8412, 8420, 5843, pcm63pk, 1704.......) If not many issues, I could handle the test at home.

話晒都係紅褲仔出身麻 !

If possible I would bring a small bottle to take some cleaning fluid home to wash the PCB myself. I know the washing procedure.

KK Sir,

Removed them and ready to test, see all at Monday.

Sugargar

I've already soldered LM1117-3.3 & LM1117-5 into the PCB already, do I need to remove them before testing on 15/9? If don't remove those parts , can do the testing also?

// If don't remove the LM1117, if any failure at primary regulation section, the over voltage will kill LM1117 then feed into DIR / DAC, all kill and bye bye la.

Dear KK Sir,

I've already soldered LM1117-3.3 & LM1117-5 into the PCB already, do I need to remove them before testing on 15/9? If don't remove those parts , can do the testing also?

"Major testing the voltage after first stage of discrete regulator. (8 group of discrete regulator), tunning the +/- 15V output to Analog power supply.
If everything OK, people should soldering back 9 piece of LM1117-5 and LM1117-3.3V LDO. And clean your PCB by supplied liquid."

Sugargar

Arrangement on 15-SEP

15/9 10:00am-12:30pm Default 版本學員 在 HiFi Fever 測試底板

15/9 2:30pm-5:00pm Plan A 版本學員 在 HiFi Fever 測試底板

20/9 理論, 最後裝箱..

Requirement : People should complete the basic soldering before coming.

Except : having trouble on SMD soldering. Do not start soldering job at 15-SEP. Otherwise 20-SEP (last lesson) cannot be finished.

20-SEP is for theory, mechanical assemble and final testing.

Still available, 3 remain stock, first come first serve at 15-Sep.

kk sir
I want to buy the digital meter, Is it still available?

11/9 (已改為Office Hour後個別送出, 7:30-8:00不會在旺角友誠等)

15/9 10:00am-12:30pm Default 版本學員 在 HiFi Fever 測試底板

15/9 2:30pm-5:00pm Plan A 版本學員 在 HiFi Fever 測試底板

20/9 理論, 最後裝箱..

No need adding additional power transformer.

Basically, if only 1 IIS in (USB in), you can draw the power from BUS. *USB bus power.

We are adding a logic gate (74HC157D) to do the selector.

When no USB signal (5V), the device will toggle to IIS (RJ45 input)

When USB in (5V detected), the device will swich over to USB output.

[quote:b3762a8c51="kk_ho"]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.[/quote]


KK Sir,

如加個usb codec可以當電腦sound card用,我都想加!
但果9V係邊取電?要加多隻牛嗎?

KK Sir,

Thanks a lot

Sugargar

Sugar,

I will bring one DMM to you, please prepare the $.

For the USB module, let me collect all reply from classmate and arrange at same time.

KK

KK Sir,

I am AD1955 default 版本學員 but I really need the digital meter to check all the resister before soldering.  I want to buy 1 digital meter ($2xx) and 1 USB module from you, can U bring those thing on 10thSept night and I can pick up all default parts also? I will paid you money at that night ok?

Sugargar

I will call admin tonight to pack the unit to you.

Are you totally default pack or Plan A / B ?

Please let us know.

I can wait you a longer bit, but hope to receive your SMS if you come late.
I think this is no good to sit too longer in a restruant.

Please drop my phone no : 93067521.

Your board will assemble and test by me. Also, I will let you know what need to test at Final assemble class.

The USB module is a KIT solution.
You need to solder the QFP IC. Total 32 pin Square shape monster.

KK SIr,

Tomorrow, I will come from Macau after work directly, I hope before 20:00p.m. arrive MK. Please wait. Do I need to bring a big bag for this kit? What I need to perpare first? Thanks.

I am the student that require the assembly service.  When should I come and test the DAC? By the way, I have ordered
the usb module. Will you assembly it all together?

10/9 7:30-8:00pm KK 會在旺角友誠 1/F 大快活等大家來拿其他零件. 大家回家連同新零件組裝, you can order the upgrade parts at that time too.

11/9 7:30-8:00pm XX (Time and person will be announce later) 會在旺角友誠 1/F 大快活等大家來拿其他零件. 大家回家連同新零件組裝

(已改為Office Hour後個別送出, 7:30-8:00不會在旺角友誠等)

// KK will be leave 大快活on time. Please drop down my mobile no. 93067521. Send SMS to me first if you are on the way.
If default 版本學員 have your own components and already soldering on board, you are no need to pick the 其他零件.

15/9 10:00am-12:30pm Default 版本學員 在 HiFi Fever 測試底板
15/9 2:30pm-5:00pm Plan A 版本學員 在 HiFi Fever 測試底板

// Major testing the voltage after first stage of discrete regulator. (8 group of discrete regulator), tunning the +/- 15V output to Analog power supply.
If everything OK, people should soldering back 9 piece of LM1117-5 and LM1117-3.3V LDO. And clean your PCB by supplied liquid.
Suppose : Testing each module : 10 min
Tunning +/- 15V output : 4 min
People soldering back LM1117 X 9 pcs : 30 min.
Check and Clean : 3 min.

Please make sure you are soldering all of components for power supply unit before you come.

20/9 理論, 最後裝箱..
// The decoding section will be test when you finish all of your connection, drilling and finish assemble of your chassics.

So, I only come to pick up the 零件 and 測試底板 on 15/9?

一半一半... 有點難搞...

這樣吧 -

11/9 7:30-8:00pm KK 會在旺角友誠(1/F)大快活等大家來拿其他零件. 大家回家連同新零件組裝

(已改為Office Hour後個別送出, 7:30-8:00不會在旺角友誠等)

15/9 10:00am-12:30pm Default 版本學員 在 HiFi Fever 測試底板

15/9 2:30pm-5:00pm Plan A 版本學員 在 HiFi Fever 測試底板

20/9 理論, 最後裝箱..

mat_tli: 1&2 我不在香港, 我選擇3

tai chi : I choose option 1, ie 11Sep08 (this Thursday) for the theory class. I guess 20Sep is best kept for building as this kit is complex and we need more time soldering before returning with the PCB.

Thanks KK for your outline of the bonus class. This helps a lot.

You may quote the maths and equatoins lightly for those who can handle.  Simulation is a good idea since we can get LTSpice for free.

Cat and all,

For the upcoming class, I will use another method of teaching.

Using our white board and label the signal flow.

So, you may need to drop it down.

Time is too tight and hope every body understanding the signal flow. I don't have time to make my powerpoint waveform moving.....

Digital Receiver, Digital filter, DAC will be use white board + power point.

Low pass filter and Output buffer will be use Power point + datasheet + Simulation Software.

Will try to skip all mathmatics due to I don't know everybody background.

KK.

Thanks admin and KK for this bonus class on DAC design !!

It is better to learn more details as soon as possible and plan for next step of our own DAC design. If every things are already assemblied but a possible upgrade is taught afterwards, then it may be too late / too difficult to implement the upgrade change on our DAC design.

So I would prefer bonus class being held on 11 SEPT. Or post teaching material topics of bonus class in advance and let us prepare our questions well before attending the class. Time is too tight in class.

20/9 will continue no matter which choice. This is a bonus lesson only

Originally the course is 2 days only. This bonus day can let u understand more about the technical details if everyone can join.

If not everyone can join, then 11th or 15th will only be opened for assembly only as to be fair to everyone, theory will be taught on 20th Sept

Hi Admin,

     Both Choice 1 and Choice 2 are OK for me. Thanks.

MAKCW

Admin,

Do you mean that if we choose anyone day for the special DAC theory course on 9-11 or 9-15, the original course plan will be shortened, day 2 & day 3 will be skipped as shown below,

Night 1 : Simple introduction, 3 type of DAC circuit analysis. ( Already have the class ).
Day 2 : Function of each 5 block. Detail operation of TDA1541A, 47 DAC ( will be skipped )
Day 3 : Function of each 5 block (cont). Detail operation of AD1955 DAC ( will be skipped )
Day 4 : Advance modfication tips. ( As schedule )

我9月15日唔得閒 , 選擇 1 OR 3 都無問題的



選擇1: 9月11日 晚上7:30-10:00

或選擇2: 9月15日 下午2:30-5:00 其中一日

或選擇3: 跟原定時間9月20日 下午2:30-8:00

lamhenry: my choice is 15/9.  Tks

KK Sir,

I prefer 選擇2: 9月15日 下午2:30-5:00 since I need to work on Friday.
Besides, I miss the class on 5/9 night, hope U can explain more to me. TKS!

Joe6 from Macau

I prefer 選擇1: 9月11日 晚上7:30-10:00

KK Sir,

I can join choice 1 or choice 2 class.

Sugargar

GOFFIC: 9月15日 下午2:30-5:00

因這次的DAC班有多位學員想深入了解技術問題, 現集合大家意見來加送一堂在9月11或15號. 請各學員發表你的意願.

選擇1: 9月11日 晚上7:30-10:00
或選擇2: 9月15日 下午2:30-5:00 其中一日

或選擇3: 跟原定時間9月20日 下午2:30-8:00

因9月20日是原定課程日期, 如選擇1或選擇2有學員不能出席, 11/9或15/9只開放作組裝, 20/9 才主力講解理論.

正式日期會在星期三中午左右確定

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

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

Deposit in class? Paypal?

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]

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

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

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.

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.

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

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

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

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