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Good news, finally I got very nice sound. But adjusting VR1 and VR2 has not effect on the + and – inputs. I have approximately 0VDC. With DAC it's still 0VDC. I measured on board the POT VR1=480 Ohms and VR2=460 Ohms. Edited by user Saturday, April 9, 2011 2:59:17 AM(UTC)
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breweryfr wrote:Good news, finally I got very nice sound.
But adjusting VR1 and VR2 has not effect on the + and – inputs. I have approximately 0VDC.
With DAC it's still 0VDC.
I measured on board the POT VR1=480 Ohms and VR2=460 Ohms.
OK so tell us what was wrong. Are your adjustments to VR1 and VR2 part of the final adjustments in relation to AVCCC/2 as listed in the manual? If it is, then you are fine.
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I had to solder joins again as you mentioned on the previsous post.
I first started to listen the output of the DAC and then the Balanced output of the LEGATO.
And finally with the SE output.
But when the DAC is not connected to the LEGATO the inputs signal level is around 0VDC.
When DAC connected the level is still at 0VDC.
"Are your adjustments to VR1 and VR2 part of the final adjustments in relation to AVCCC/2 as listed in the manual? "
No that's the problem AVCC measured is 3,3VDC.
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IIRC, I too could not get my setting to exactly 1/2 AVCC. Also note that the voltage changes very slowly when you adjust the VRs. Make a small adjustment and wait. If you turn the VR stop to stop quickly, it can appear that nothing happens.
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