cwlam,
Try the following step by step.
1. SP-10 input short to GND, volume set to max. measure output using another power amp, connect with a cheap speaker for testing.
2. UCD180 input short to GND, measure the output (connect the speaker).
If both connection is OK, your setup have a higher GND (earth) protential difference.
Try 1 and 2, if not ok, phone me
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[quote:ab8a473326="cwlam75"]日前終於完成我部SP10, 接上之前上堂嘅UCD180, 發覺有Noise問題, 部SP10嘅用PCB板, 冇撘橋, 就算冇插source, Vol 置零... Speaker有D SeeSeeSaSa 聲...
係咪grounding方面要做嘢?[/quote] |