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Old 12th October 2003, 09:15 PM   #1
nbcd is offline nbcd  Romania
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Question interesting noise!!!

hy guis


I have an 3W amplifier from computer desktop speakers.The trafo was to week and i thaught it would be a good ideea to remove the trafo and supply the amplifier to the computer ATX's power source.Thus i introduced the amplifier into the computer casis but
i realised that interesting noises were done specialy when moving the mouse,or when dragging something on the desktop or when HDD was working.

Can anyone tell me why those sounds are heard?
OBS
my computer does not have any GND atached to the casis



All the best
!!
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Old 13th October 2003, 09:12 AM   #2
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Most all computers have a three-wire power cord. Your's doesn't?

Even then, it will still probably be noisy. The computer power supply has a lot of switching hash on the outputs.

Try filtering the 12V going to the amp and see it it helps (couple of 3300f 16V caps, with a .18f non-inductive type or two for a bypass).
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