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Old 5th May 2009, 11:07 PM   #1
HaLo6 is offline HaLo6  United States
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Question DAC problem... cracking on speaker...

I am trying to troubleshoot this problem but its beyond my level. I built the ezDAC and it works for a little while then it starts making loup crackling and popping noises ...

I measured the DC offset on each channel and its only 4mV on the right and 2mV on the left.

What could be causing this issue?
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Old 6th May 2009, 11:43 AM   #2
HaLo6 is offline HaLo6  United States
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bump? sound like an y common symptons? I am new at this so hopefully there is someone with more experience than I that can help me!
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Old 7th May 2009, 12:48 AM   #3
amc184 is offline amc184  New Zealand
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It could be caused by a bad solder joint. It might pay to have a careful look over for dry joints, etc. Is the crackling present on both channels?
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Old 7th May 2009, 02:43 PM   #4
HaLo6 is offline HaLo6  United States
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I have checked all the solder joints they look good, its in both channels after about 5 mins of use. The first five minutes it sounds great!
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Old 7th May 2009, 10:47 PM   #5
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Sound like heat related, spray a bit of freeze gas on the output componets one at a time when it is crackling, and maybe you will find the fault if it stops crackling.

Cheers George
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Old 17th May 2009, 02:48 AM   #6
HaLo6 is offline HaLo6  United States
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So I think I figured it out. It was a power supply issue. I was supplying the DAC with +/-13.86V DC from an eZDual which appearently wasn't enough, so I had a Twisted Pear LCBPS which I could adjust the output so I adjusted it to +/-15V DC and I have no more crackling. I tested it for about 15min and it sounded good. Using the ezDual it took about 5 min and the crackling would start, so I imagine the opamps weren't getting enough juice...

Does this line of thinking sound right... I'm learning here!
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