Electronics > Beginners

Speaker/Stereo Amplifier Question

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williefleete:
what is the earthing like on the amp and computer, because computers use switchmode powersupplies they need an earth reference, if you have no earth you have a rather live case which is at least half mains this may be where your hum is coming from, it may be because you have a voltage difference between the earth on the PC and the earth/0 volt line in the amp and the hum is coming from a mains side line or bad power caps modulating the DC out of the switchmode or something

thakidd:
@WillieFleete: You know, I have been scratching my head at why the amp does not have a ground included. I have a Yamaha receiver in the living room that does require the third ground pin. I guess they figured it was not needed back in 1989? I am wondering now if maybe I should ground the amp case to fix the problem. It is metal so I am assuming that the amp boards ground themselves in one way or another to the amp's case. Off to Google I go to check out your idea.

All of the PCs however are properly grounded. All of the PCs use Antec ATX standard supplies and all supplies are no older than 3-4 years old. They are are properly grounded. Some of the peripherals, however are not, such as the switch, kvm, router, etc. Those devices should not matter directly as they are not part of the audio system.

Lance:

--- Quote from: thakidd on December 02, 2010, 07:12:33 am ---@WillieFleete: You know, I have been scratching my head at why the amp does not have a ground included.

--- End quote ---
Then your choice is clear. Build a new amp!

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