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Old 2nd June 2012, 08:30 AM   #21
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Quote:
Originally Posted by repeet View Post
I have a newer version of this board V1.7. I'm not sure of the differences but there are 2 small dip switches on this version.
I also fitted OPA827 and LT1364 Opamps.
It's the same board as I have. The DIP switches are hidden in my photo by the Tenor USB board. Have you done any listening or testing yet?
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Old 2nd June 2012, 08:35 AM   #22
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Originally Posted by alkasar View Post

Can you recheck the components values on board ?
Yes, and there are some discrepancies. I copied and modified your output schematic to match what I found:

http://www.circuitlab.com/circuit/9q...tput-as-built/
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Old 2nd June 2012, 09:15 AM   #23
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I ran the RMAA tests and found striking differences between having the DIP switches ON or OFF. Things look better with them ON for me. In both cases, I'm using the Tenor USB interface.

RightMark Audio Analyzer test: comparison
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Old 4th June 2012, 07:03 AM   #24
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I plotted the data of the test square waves on the CD. These plots show that the square wave data was passed through a low pass filter around 20 KHz before being written to the CD. The waveforms I'm getting from my DAC5 aren't too far away from the CD data.

I still wonder, though, why the 1KHz square wave from the DAC5 seems to have tilted tops and bottoms.

1KHz Plot
Click the image to open in full size.

5 KHz Plot
Click the image to open in full size.

Last edited by dhalbakken; 4th June 2012 at 07:15 AM. Reason: Make image links work.
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Old 7th June 2012, 08:19 AM   #25
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Could you post the schematic of the DAC5 please?
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Old 11th June 2012, 06:09 AM   #26
repeet is offline repeet  Australia
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What does the middle LED do?
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Old 11th June 2012, 01:15 PM   #27
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It is on when input is coxial or optic fiber
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Old 11th June 2012, 01:26 PM   #28
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I need DAC5 schematic too. I bought the kit from Taobao but no output for coaxial and opt. Any one can help me please?
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Old 12th June 2012, 01:59 AM   #29
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I think I should not post the schematic to a public forum without permission from WEILIANG.

I was curious about the DIP switches, so I did a little more investigation. SW1 is connected to pin 22 of the WM8741. When the switch is open, pin 22 is high; when closed, pin 22 is low. This controls the oversampling rate. It also seems to affect which digital filter is selected in the WM8741. At the low oversampling rate (switch closed), a "Linear phase half-band filter for backward compatibility" filter is used. At the high oversampling rate (switch open), a "Linear phase 'soft-knee' filter" is used. For more details, see the WM8741 data sheet.

This seems to explain the differences measured through RMAA with the switches in the two different positions.

Dave

SW2 does not seem to be connected to anything, so I guess it is there for mechanical support.
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Old 12th June 2012, 03:58 AM   #30
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Quote:
Originally Posted by dhalbakken View Post
I think I should not post the schematic to a public forum without permission from WEILIANG.

<snip>
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