SP10 Noise Problem

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?

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
93067521 KKHO
8:00pm-11:30pm Mon-Fri
Sat-Sun any time.
Receive only with caller ID.

[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]

KK, will call you, thx!

KK,

I tried to use iPod to connect UCD180 directly (without SP10) and found that it still have the noise as mention, so it might be just the UCD180 problem.
I will be calling you when I have time, most likely after Chinese New Year.
Thank you!

Call me anytime.

KK.Ho

KK Sir, I want to join the 高級揚聲器製作班 2007, but want to fix the noise problem 1st... will you be able to visit me for checking in Kowloon City?

LAM,

Sure not a problem

See the schedule below:

19-23 (any one evening night, we visit your home and do the problem finding.)

24-25 (any half day, we carry the equipment to fix it, if we cannot solve this at first visit.)

KK.Ho
93067521

KK Sir, 19 Mar is perfect.
I will call you tomorrow, thanks!

KK Sir, what happened to you?
As agreed, you were supposed to come around 7pm yesterday, I called you few times, and left you voicemail too.
I was waiting for you whole night yesterday!  :evil:

Dear Lam,

I rememeber this visit but I forget to write down your tel.

I have urgent meeting with customer at yesterday night, so I cannot back to HK and goto your home to solving problem.

Sorry about that,

could you mind email your contact phone no to my email ?

I will call you at afternoon time to arrange a visit.

KK.Ho