新完成的USB-DAC，請大家鑑賞，並指教！
發表於 : 週五 6月 20, 2003 10:51 pm好棒,就剩下裝箱摟
不過為什麼不將之前敗的黑盒子用上去阿???
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發表於 : 週五 6月 20, 2003 10:51 pm發表於 : 週五 6月 20, 2003 11:00 pm發表於 : 週五 6月 20, 2003 11:04 pm加油,剩機箱了.
發表於 : 週五 6月 20, 2003 11:14 pmLifaung兄∼
因為〞聽說〞Rifa比較好聲啦！加上手頭有，所以就試試囉！
不過考量裝箱的難度(因為交連電容突出PCB板，會讓USB接頭無法突出箱外)，最後也許會換Blackbox，也不一定！
請原諒新手的〞猶豫不決〞！
因為〞聽說〞Rifa比較好聲啦！加上手頭有，所以就試試囉！
不過考量裝箱的難度(因為交連電容突出PCB板，會讓USB接頭無法突出箱外)，最後也許會換Blackbox，也不一定！
請原諒新手的〞猶豫不決〞！
發表於 : 週五 6月 20, 2003 11:32 pmPeleus 寫:請原諒新手的〞猶豫不決〞！
想太多了吧.發表於 : 週六 6月 21, 2003 1:53 amPeleus 寫:Lifaung兄∼
因為〞聽說〞Rifa比較好聲啦！加上手頭有，所以就試試囉！
不過考量裝箱的難度(因為交連電容突出PCB板，會讓USB接頭無法突出箱外)，最後也許會換Blackbox，也不一定！
請原諒新手的〞猶豫不決〞！
I love BlackBOX more than Rifa
Very Beautiful! All Holco 
ELNA LT Regulators
Which type of diodes are you using ?
Maybe you can try to get some ultra fast /soft diodes..
this can give u even better sound quality...richer sound
The two small 10uF next to the big DC coupling cap belongs to analog part... I do think use ELNA/Blackgate would be better than OS-CON
發表於 : 週六 6月 21, 2003 2:33 am用料真補... 
快試試聲音如何..???
快試試聲音如何..???
發表於 : 週六 6月 21, 2003 8:55 amTo Tux~
About the Diodes, I do not know the type, but the sales said it is ultrahigh speed in 35ns. I heard that the higher speed, the more pure power. That's why I try it! For avoiding the opening-closeing noise from the diodes, I used the Philips MKP cap. I would like to here your suggestion of the type of diodes. I do not know well about the relationship between the diodes and the quality of sound.
The regulators in digital power source is LM, not LT. I once try to buy some LT regulators, like LT 1086, from digikey, but it cost too expensive, so I give up and buy LM regulators from KEC.
About the OS-Con caps in the analogal power, I will make a decision after I here the sound. However, It may take a long long time because I do not have the amp and loudspeaker yet. I make the USB-DAC, gainclone(using TDA7294 chip), and loudspeaker(using a full-range driver, Fostex FF85K) at the same time. So, there are lots of work to do.
Using Rifa or WIMA Blackbox, it is hardly to get good answer. So, once again, whether chang it or not, I will make decision after here the sound.
Thanks your interests and suggestion. Any correspondence will be welcome.
About the Diodes, I do not know the type, but the sales said it is ultrahigh speed in 35ns. I heard that the higher speed, the more pure power. That's why I try it! For avoiding the opening-closeing noise from the diodes, I used the Philips MKP cap. I would like to here your suggestion of the type of diodes. I do not know well about the relationship between the diodes and the quality of sound.
The regulators in digital power source is LM, not LT. I once try to buy some LT regulators, like LT 1086, from digikey, but it cost too expensive, so I give up and buy LM regulators from KEC.
About the OS-Con caps in the analogal power, I will make a decision after I here the sound. However, It may take a long long time because I do not have the amp and loudspeaker yet. I make the USB-DAC, gainclone(using TDA7294 chip), and loudspeaker(using a full-range driver, Fostex FF85K) at the same time. So, there are lots of work to do.
Using Rifa or WIMA Blackbox, it is hardly to get good answer. So, once again, whether chang it or not, I will make decision after here the sound.
Thanks your interests and suggestion. Any correspondence will be welcome.
發表於 : 週六 6月 21, 2003 8:57 am好像很少人說到如何測試這個USB-DAC是否可以正常工作？
可不可以請諸位大大建議一下，如何測試這個USB-DAC?
以避免燒了機器或壞了零件的，先謝謝哦！
可不可以請諸位大大建議一下，如何測試這個USB-DAC?
以避免燒了機器或壞了零件的，先謝謝哦！
發表於 : 週一 6月 23, 2003 12:48 am先用洞洞版搭個簡單的電路檢查四顆穩壓
穩壓ok 電容極性ok 變壓器上電ok OP方向正確
應該就沒問題了.......
超好做......
有說跟沒說一樣
穩壓ok 電容極性ok 變壓器上電ok OP方向正確
應該就沒問題了.......
超好做......
有說跟沒說一樣