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Old 29th June 2013, 06:34 PM   #911
sipo75 is offline sipo75  Europe
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Default Unbalanced direct output

I have some issues setting up the unbalanced direct output.

I have switched the output to unbalanced with the remote. I have removed the jumpers J5,J8 and J7,J6. Attached is a screenshot from the oscilloscope showing a peak to peak square wave of 25V. That is with full volume on the computer and on the DAC.

This was with no load on the output.

I tried 10 Ohm to GND which does tear down the swing to 730mV pp. The waveform looks pretty bad though on the oscilloscope.

So 10 Ohm to GND is the way to go?
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Last edited by sipo75; 29th June 2013 at 06:36 PM. Reason: Jumper settings documented
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Old 29th June 2013, 07:13 PM   #912
sipo75 is offline sipo75  Europe
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It's 2.56 Vpp - I did not compensate the probe.
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Old 30th June 2013, 07:49 PM   #913
kmajjo is offline kmajjo  France
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Quote:
Originally Posted by audiodesign View Post
yes, the secondary must be change otherwise the phase is not correct
Hello,
Can i use MKP 33uF in place of OS-CON 22uF ?
Br
Jacky
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Old 1st July 2013, 03:29 AM   #914
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Quote:
Originally Posted by kmajjo View Post
Hello,
Can i use MKP 33uF in place of OS-CON 22uF ?
Br
Jacky
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Old 1st July 2013, 11:10 AM   #915
caad is offline caad  Denmark
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Quote:
Originally Posted by sipo75 View Post
I have some issues setting up the unbalanced direct output.

I have switched the output to unbalanced with the remote. I have removed the jumpers J5,J8 and J7,J6. Attached is a screenshot from the oscilloscope showing a peak to peak square wave of 25V. That is with full volume on the computer and on the DAC.

This was with no load on the output.

I tried 10 Ohm to GND which does tear down the swing to 730mV pp. The waveform looks pretty bad though on the oscilloscope.

So 10 Ohm to GND is the way to go?
Oscillation @ 1kHz seams strange and should not be there even volume is set to max. Did you apply any signal to the input?
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Old 1st July 2013, 01:44 PM   #916
sipo75 is offline sipo75  Europe
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Quote:
Originally Posted by caad View Post
Oscillation @ 1kHz seams strange and should not be there even volume is set to max. Did you apply any signal to the input?
I posted the screenshot because I was seriously confused about Vpp.

Input is generated on the PC via the Amanero USB interface.

I can see a lot of high frequency content in the output. I am still trying to understand where that comes from. For one the 2x6V is supplied by a toroidal transformer. So any unexpected results are most probably due to my lacking measurement setup and build.

I was more surprised by the overshooting and the high frequency content. There is still a lot to learn for me - this is my first DIY DAC.
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Old 1st July 2013, 07:22 PM   #917
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Default Balanced Bride Off Zen as I/V

Hi Audiodesign how can I use this as I/V ?


http://www.firstwatt.com/pdf/art_bosoz.pdf
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Old 2nd July 2013, 03:51 AM   #918
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Quote:
Originally Posted by Erlend Sæterdal View Post
Hi Audiodesign how can I use this as I/V ?


http://www.firstwatt.com/pdf/art_bosoz.pdf
yes, you can use it, but need use DAC out with I out!

thanks
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Old 2nd July 2013, 04:07 AM   #919
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So the chassis (unassembled) is ready for delivery?
If so, I will complete my second payment?
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Old 2nd July 2013, 04:34 AM   #920
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Quote:
Originally Posted by linuxfan View Post
So the chassis (unassembled) is ready for delivery?
If so, I will complete my second payment?
please give me another week, I'm waiting for it on!

I deeply hope you understanding me.

would like to thank you
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