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post #71 of 77
Quote:
Originally Posted by All3n View Post

Quote:
Originally Posted by axipher View Post

I'd avoid using an anti-static bag or a motherboard box for under the motherboard. Some anti-static bags are actually conductive on the outside. Your best bet is just a regular plain brown box.


You'd be surprised what things can actually be conductive, even certain batches of ink used in news paper and magazines can be slightly conductive.

Geez, good to know, I do that all the time! Cardboard only from now on, plus it's more readily available.

+Rep for sure on that one.

 

It's not as much of an issue with motherboard since everything is less than 12 V, but when you get in to 24 V DC circuits, there's enough voltage.

So far, the only problems I've actually had on 12 V and less circuitry on a surface like an anti-static bag was using some 555 timers with RC logic. Basically the timer chip uses a combination of resistors and capacitors for timing and the slightly conductive surface was causing some weird effects on the timing. No damage, just unexpected results which is what I'm pretty sure we are trying to eliminate here.
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post #72 of 77
Thread Starter 
So I went to finally start the tear down i went to unplug the amp power adapter, but I just moved it lightly and noise stopped :S

So with my finger i tilted it left and noise came back, then moved it right and it disappeared !!! Cheap American adapter!!!!


So I bough myself a proper UK power adapter hope that will be the final solution for this problem!!!
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post #73 of 77
Thread Starter 
[Update]

It was the earth loop, my amp is now not connected to the earth loop and it's all good. UK power adapter didn't fix the problem but what i found out is that without using the earth pin the amp does not make any more noise!!!
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post #74 of 77
Quote:
Originally Posted by Mariusmsj View Post

[Update]
It was the earth loop, my amp is now not connected to the earth loop and it's all good. UK power adapter didn't fix the problem but what i found out is that without using the earth pin the amp does not make any more noise!!!

So the loop existed when you were sharing a common ground between the PC and your amp. When you use an MP3 player or Laptop, your not connected to the ground and the loop is removed. This seems to make sense biggrin.gif. Glad you found the culprit!
post #75 of 77
Thread Starter 
Quote:
Originally Posted by Mattb2e View Post

So the loop existed when you were sharing a common ground between the PC and your amp. When you use an MP3 player or Laptop, your not connected to the ground and the loop is removed. This seems to make sense biggrin.gif. Glad you found the culprit!

It seems so BUT now my amp and speakers are not grounded frown.gif
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post #76 of 77
Try using an amplifier that does not have a ground pin by default. Over here they are called "Class II" or "Double insulated."
They are built in such a way that if a failure was to occur, it does does not rely on a grounded chassis. This is safer then removing the ground plug yourself, because these devices need they ground for safety and possibly proper function.

In North America these 2 prong plugs have one blade that is wider then the other, to ensure the neutral is connected to the proper side of the outlet. (The ground is actually connected to the neutral back at the electrical panel, so they can share similar functions to the "ground", if properly designed.)

As I said earlier, I only ran into the problem when started making my own amplifiers. For obvious safety reasons all my homegrown amps have grounds. It's easier and safer for me to ground my chassis, but this does make it difficult at times as the second ground can introduce all kinds of issues into audio, as you have found out. These issues are primarily overcome by optimal routing and connecting of the grounds per condition. When you hear people refer to "star grounding" this is what they are trying to achieve, having all grounds take their own path ground or meeting at one point.

Grounding problems don't always occur, it really depends on the specifics of the devices and locations, that being said, some device have tendencies.

Nice that you made some progress.
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post #77 of 77
Thread Starter 
Thanks All3n smile.gif

i'll try and see if I can work something out. I'll try special forums with owners of the amp that I got
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