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Old 23rd November 2014, 06:12 AM   #1
ishiru is offline ishiru  Indonesia
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Default audible hum.trafo or groundloop?

hello there..i've been struggling w/ my DAC's hum which is appeared even i turned my volume knob to 0

here's the oscilloscope trace at 2mV 1ms/div

full :
Click the image to open in full size.

half :
Click the image to open in full size.

0 :

Click the image to open in full size.
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Old 23rd November 2014, 09:05 AM   #2
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Images won't open but with volume control at zero, if there still is hum, I would say ground loop.
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Old 23rd November 2014, 01:45 PM   #3
ishiru is offline ishiru  Indonesia
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crap...i'll re-upload them tomorrow..

i'm confused how to eliminate the ground loop..i tried to deattach the body ground but no good result
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Old 23rd November 2014, 01:55 PM   #4
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Use the Star system for grounding.
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Old 23rd November 2014, 01:59 PM   #5
ishiru is offline ishiru  Indonesia
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i'll try it..should i ground the tube heater too?..

i have 3 tranny rn..1 for pre tube, 1 rectifier, and 1 for digitals..
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Old 26th November 2014, 09:52 AM   #6
ishiru is offline ishiru  Indonesia
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i found the problem..somehow i didnt connect my digital ground to the star ground
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