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Old 13th October 2012, 05:45 PM   #151
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Join Date: Aug 2009
Location: Da Nang, Viet Nam
I removed I/V stage and replace with LL1544A transformer (ratio 1:2).The sound is better .
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Old 17th October 2012, 02:29 AM   #152
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The configured to replace WM8740 with WM8741 .
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Old 6th November 2012, 08:40 AM   #153
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Location: UK, Manchester

I have a strange hissing on the right channel, it could start after an hour or two or could be heard even after 5min once the DAC is turned on. It's quite loud and very disturbing, as to the the music it continues to play on the same volume. Then after a minute or even 3-5 it suddenly vanishes like it appeared. The DAC operates with open lid, should not be any overheating. All joins have been resoldered, pbc checked for any micro tin remains.

Once it happens all power supplies show same correct voltage as before, what else could be checked here and what theoretically could be the reason of such hissing/ cracking white noise?
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Old 8th November 2012, 11:59 AM   #154
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newbie here. i plan to connect this DAC to Lm4780 amp. Is the op-amp needed for better sound? or i can bypass the op amp?
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Old 17th November 2012, 02:30 PM   #155
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Join Date: May 2010
Location: Texas
Hi Singod87,
If you have the newer version with the pots to adjust DC on output,and your amp doesn't need a preamp, then you can jump it and see if it has enough gain,also as you know opamp's have different sounds ,if any DC on the output of the dac output, use a input cap or check your amp input and see if there's one there then you won't need to add that cap,
Post back your results ,What amp are you using,It sounds good with gainclones!
Happy Listening,
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