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USHER CD-100 modification(2)

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Why you should use Eddie Wang Audio Art. Works?......實現Hi-End,不必天價!Hi-End will down to us.


r.委託USHER CD-100改機

  • 改機方式與上一台不盡相同,針對網友預算及需求加以評估改機方向。

  • CDPCB為雙面銅箔的玻璃纖維板,較不容易解焊,請特別小心施工!

  • 因篇幅關係,故僅post重點改機部份。

  • The original main power filter capacitors.
  • 原主電源濾波電容6800uF/25v
  • The capacitors up grade to 10000uF/40v. & the Diode change to 4pcs of 1N5062. 
  • 主電源上的整流二極體改為Philips PH5062、高品質金屬膜電容、濾波電容升級為P10000uF/40v
  • +5V Regulator IC for D/A chip.
  • 經檢查電路後發現這顆7805主要負責D/A chip+5V電壓的供應。
  • 直接可以使用本站內的VRM直接取代原來7805。(但實際測試結果因輸入電壓過高,LT1085上的溫度達90幾度,有過熱問題,後來還是改回原來的7805若空間容許可以為7805加上散熱片。)
  • D/A chip附近的零件配置。
  • The original design of analog output signal coupling are use series connection two capacitors.
    • Change it to one Bi-polarized type capacitors. (see below picture)
  • Analog output輸出交連電容是使用2顆有極性330uF/16v串聯來當作無極性電容使用。
  • 修改後使用德國ROE無極性交連電容。
  • Analog Output RCA socket change to Gold plated RCA socket.
  • 連接導線為純銀單蕊導線。Use pure silver wire to connected PCB & RCA socket.
  • Add a copper cover to D/A chip. It can be reduce EMI noise.
  • D/A chip加上隔離雜訊干擾用的銅塊。
  • finished.
  • 大致完成。

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