2008多項課程召集 - (1) 春季 DAC 原理和製作班 （完滿結束）

我想參加 Hi-End DAC 製作班加膽輸出線路，唔該哂！

Admin先生:

已報了膽輸出 DAC (Order #468)，食晏就去過數，唔該哂。
不過唔好意思，張 Order 唔覺意加個舊 item (300B, VT60SE 膽後級組裝班) 落去。勞煩你 ignore 果個舊 item，唔該!

Hi KK Sir, 我都想要線路圖，我是砌 tube buffer 黑色底板的，唔該哂!
可否 send 到這裡的 mailbox (andypoon@hififever.com) ?

[quote:09c748a079="Admin"]各 DAC 學員請留意, 本星期五7:30pm會開始測試已完成的DAC

另外3月21日 10:00am 加堂裝機箱, Tube buffer 等等[/quote]
3月21日是公眾假期o番!

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 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!

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.

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

[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,

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