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Old 4th May 2012, 07:33 PM   #251
diyAudio Member
 
Join Date: Apr 2011
Hi northernsky,

I think i am having the sane issue.

I removed the multiplexer mute chip.
I Also added the four 470 ohms to reduce output voltage.

I realized one of my amps didn't work.
So I tried a little SEP amp with capacitors at it's inputs and it sounded well.
So I am guessing I have the same DC problem.

Now I am adding 2 PIO .33 UF caps to test with my main amp and see how it goes.

Even with this work arround, there should be a cleaner way of fixing this issue?
I am afraid of those bypass caps ruining the sound..

Cheers
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Old 4th May 2012, 08:13 PM   #252
diyAudio Member
 
Join Date: Apr 2011
Listening to the new setup now.
It sounds well, distortion seems to have dissapered.

I don't have a pre, just volume on a Mac.
My speakers are super sensitive so I guess I will adjust again those opamp resistors to reduce opamp gain a little more.

What makes me happy about this setup is that I am not noticing a high frequency roll-off as when using a potentiometer before the power amp Push Pull el84.
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Old 5th May 2012, 02:31 PM   #253
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Join Date: Apr 2011
But even when my system performace has improved
Is a coupling CAP between dac and power ideal?
I guess, a less component approach is aleŠis better when possible.

Ideas to remove opamp stage bias:
1) test upgrade opamp power supply?
2) matching resistors in opamp section?
3) or just use a very boutique cap ?

Thanks
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Old 3rd August 2012, 02:36 AM   #254
prezden is offline prezden  Canada
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Join Date: Nov 2008
I am looking to buy a GigaWork DAC but can't any place that sells them. Can anyone steer me in the right direction.

Thanks
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Old 13th April 2013, 01:04 PM   #255
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Join Date: Aug 2010
So, somebody decided to problem of noise in pauses, after shorting mutes (short cut the 4056) It is very unnerving to hear the noise =))))))
If someone is interested in measuring of this DAС
lampucera.png ? Yandex.Disk

Last edited by Astaro; 13th April 2013 at 01:12 PM.
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