2008多項課程召集 - (1) 春季 DAC 原理和製作班 （完滿結束）

Dear KK Sir,

I'am sorry that I cannot attend the class of this Friday. Do you have another day for the class.

Thanks.

明

Call me tonight for one on one session.

To be fair to other classmate, only apply ONE time 1 on 1 to you.

Hope you can finish at ONCE time.

KK

Dear KK Sir,

Thank you very much!

You are a nice teacher that I meet. If there is no classmate having the same situation like me, I can assemble at home and be arranged the testing and measuring at the other lesson you teach such as the coming CD lesson. Tonight I call you.

Once again thank you your teaching and work hard over several night for the class.

明

Dear KK Sir,

Thanks you for your help, I am the last one leave the class last Friday.

The DAC is much better than I expected when I tested at my home.

Lastly please don't forget me in the coming CD lesson too

Freddy

KK Sir,

我是砌「大阪」的「日本人」，想請問一下，你上次在 I/V & LPF 線路圖上刪除的電阻及電容，它們原本的作用是甚麼呢? 如果我想同時設有 tube buffer 及 op-amp 輸出，是否要裝回這些零件呢?

謝謝!

Hi KK Sir,

I could not come on the coming Friday, I could only arrive after 6:00pm. How long will you stay? Since I need to complete all the component first may I have all the values for the tube buffer circuit diagram?

By the way, the testing at home is very good, thanks a lot for your help.

Thanks.

All,

See the diagram and result below.

All are the REAL result from circuit simulator.

有根有據吾係吹

Powered by Texas Instrument TINA SW.

You can downalod this SW (Free) by following link:

http://www.tina.com/

KK.Ho

20KHz cut off.

Charge / discharge problem across the output cap.

You can adding a relay board to solve this. I remember I have this....

Let me check at Fri..

Kun,

Sorry, I erase your message.  

But your problem can be solve.

Admin,
how to recover?

KK

KK Sir,

Sorry to bother you again, I need to assemble the tube buffer at home and bring back to assemble at Friday after 6:00pm. May I have the figures for the components?  I have attached my portion for your reference.

D203        IN4001
D204        IN4001
D205        IN4001
D206        IN4001
C218        103uf
C219        103uf
C220        104uf
C221        104uf
C214        6800uf
IC201        LM317T
R219        220r
R220        910r
C215        1uf
C216        4700uf
C217        10uf

D201        MR760
D202        MR760
R216        150K
R217        6K8
R218        3K6
C211        47uf
C212        100uf
C213        47uf

C201        104uf
R201        1M
R203        1M
R213        6K8
R205        10K
R206        10K
R211        680R
R209        100R
C203        220pf
R1        ?
R2        ?
C205        1000pf
C207        4.7uf/100V
C7        680p
R221        1M

U1        ?
R20        ?
R21        ?
C11        ?
D11        ?
DELAY        ?




Thanks very much for your help!!

BCheong

Dear all,

Sorry that tomorrow supplementary need to be postponed to next Sat (29th Mar) due to some cases and components are not ready before the holiday

各學員對不起, 因部份機箱零件在假期前未趕及到來, 所以明天的加堂要順延至下星期六 (3月29日), 敬請原諒

Hi William,

請問砌大機箱的同學可否照常上課呢？ 我的黑板還未開聲啊!

我都想明天完成我的DAC。

Chris

[quote:a1bafe5014="chariot"]我都想明天完成我的DAC。

Chris[/quote]

Me too !

Hi bcheong,

D203 IN4001 <- IN4007
D204 IN4001 <- IN4007
D205 IN4001 <- IN4007
D206 IN4001 <- IN4007
C218 103uf  <- 104 = 100000pF = 100nF
C219 103uf  <- 104 = 100000pF = 100nF
C220 104uf  <- 104 = 100000pF = 100nF
C221 104uf  <- 104 = 100000pF = 100nF
C215 1uf  <- not required

R216 150K <- 6K8
R217 6K8  <- 150K
C212 100uf <- 22uF
C213 47uf <- not required

C201 = C202 104uf <- 104 = 100000pF = 100nF
R201 = R202 1M
R203 = R204 1M
R213 = R214 6K8
R205 = R208 10K
R206 = R207 10K
R211 = R212 680R
R209 = R210 100R
C203 = C204 220pf
R1 ?  <- short by wire
R2 ?  <- short by wire
C205 = C206 1000pf
C207 = C208 4.7uf/100V
C7 = C8 680p
R221 = R222 1M

U1 ? <- IC NE555 (7555)
R20 ? <- 1M (1/4W)
R21 ? <- 47R (1/4W)
C11 ? <- 22uF ~ 47uF
D11 ? <- IN4007
DELAY ? <- RELAY: Do not solder the provided relay (OMI-SH-205L) at the moment as there is a problem with the driving circuit, KK will follow up.

AP,

Thanks very much for your information. You have finished your board?

BCheong

Hi BCheong,

You're welcomed.  I've finished soldering the PCB but not tested yet.  Will go to HiFi Fever now to do some metal works and attend the CD transport test.

Andy

KK,

My DAC is working. Thanks for your help.

Chris

Hi William sir,

請幫我准備機內AES/EBU用的110 Ohm線及有關零件，

Thankyou ^=^

歷奇

William,

Let me handle for the 110 ohm cable.

KK.

[quote:a61205a780="likylam"]Hi William sir,

請幫我准備機內AES/EBU用的110 Ohm線及有關零件，

Thankyou ^=^

歷奇[/quote]
Hi KK & William,

I want those 110 Ohm cable & components for balanced digital input too.  Thanks.

Andy

KK Sir,

Thanks very much for all your help in the past few weeks. I could see how hard you tried to help fools like me to construct a DAC. I really really appreciate your work. The DAC is great and I turned on my amp everyday since then. Further, I am looking forward to joining the CD workshop in the near future.

By the way, what time will the session start this saturday? I need to complete my tube buffer. On the other hand, I have damaged the sample DAC board last time, I think I need to pay for it this time.

Cheers.

BCheong

BCheong,

Coming SAT is OK (full day + night). But I need to confirm with Admin there are any Cable class at that day.

Please wait Admin feedback.

KK

Yes, this Sat will be the final date for DAC assembly

Time to start: 10:00am
Time to end: depends....

KK,William;

明天長週要返工，我想四點後先可到，唔好意思！
你地住機先，留返個位我。

謝謝^=^

歷奇

likylam,

Wait you la...

No problem la

But....
"你地住機先，留返個位我"

寫好小小, 我無所謂, 明你講乜
有D人吾明如 "前乜加仙" 影相佬+口號創作佬見到又儍架嗱

K Sir

KK Sir,

請問 24.576MHz 晶振明天有得攞未? 如果有我才搬機上來改 Re-clock。
另外大黑板的 Signal Select Board 上的 "Signal" LED 唔着，是否要把 DAC Board 的 J18 和 Signal Select Board 的 J7 駁埋先會着燈呢?

o架仔上

Thanks for attend the TDA1541A MKIII DAC class.

Will post the photo later.


Next :
TDA1541MK4............ Coming at early summer.....

Dear KK sir；

是今天6:00 pm 繼續嗎？
Thankyou ^=^

歷奇

Photo for DAC class III

Photo II

所有人注意:

過埋今晚,再約就只可係星期日,閒日及逢星期六可能性係零

今晚6時30分到11時為止

差DD安裝線的就快手小小

差好遠的…我再諗諗

K哥之王上


[quote:d79caf8f1b="likylam"]Dear KK sir；

是今天6:00 pm 繼續嗎？
Thankyou ^=^

歷奇[/quote]

雖然困難重重, 但得到的都不少

1. 可以得到kk幫忙 / 指導 - 我會俾心機搞好佢
(原來kk同我係中學校友, 多謝師兄) :wink:

2. 還有, patrick大哥的分享經驗  
3. 見識到其他同學的"藝術品" - "屋仔起得好靚呀"

kk, 遲少少我搞埋手尾, 再約您 :!:

再一次同各位同學仔, william, kk 講多謝

Hi william sir ;

請問粒 Re-Clocl 幾貨？

Hi william sir ;

請問粒 upgrade Re-Clocl 幾時返貨？
請通知聲！Thankyou ^=^

歷奇

KK sir,

Let me know if there is a chance to complete my DAC from 12 to 16 April. I could come on office hour. Thanks.

BC,

Which part are not complete?

If not too much, you can do this at CDM9 together.

K Sir.

KK sir；

唔好意思，想問多次 AES/EBU 輸入果個綱頁，因我上ti.com找唔倒！？

Thankyou so much ^=^

歷奇

FYI....

Any problem, call me

Hi KK,

No too much, I got some cables to reconnect. Some holes to drill (as I done it incorrectly last time), and test the tube buffer. Could I come at office hour during the CDM9 course, therefore, I could finish it first before the CDM9.

Thanks.

B Cheong

[quote:68f24c01bd="kk_ho"]FYI....

Any problem, call me[/quote]

Thankyou sir ^=^

歷奇

Hi KK,

How can I mod my DAC to become NOS?

Regards,
Chris