audible hum.trafo or groundloop?

Status
This old topic is closed. If you want to reopen this topic, contact a moderator using the "Report Post" button.
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 :
An externally hosted image should be here but it was not working when we last tested it.


half :
An externally hosted image should be here but it was not working when we last tested it.


0 :

An externally hosted image should be here but it was not working when we last tested it.
 
Status
This old topic is closed. If you want to reopen this topic, contact a moderator using the "Report Post" button.