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Head-Fi - Alien DAC Construction Thread
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I might try reflowing all your joints on the USB connector. You might have a cold joint affecting the pull-up resistor. This would also make sense since in the act of unplugging and plugging in the DAC would would have had mechanical force on the USB jack.
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This is more of a casing question, but anybody know the best way to cut out the square hole for the USB in the aluminum end of a 1455C801?
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Are you checking AC or DC? And is this without load or with load? You could just being seeing the output capacitor loading up and starting to filter DC. When I first tested mine it took forever for the output caps to "fill" with no load, but once I out my headphone amp on the end it happened quickly.
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Check your connector wiring. When I first hooked my up (with alligator leads), I had perfect sound from one side and garbage from the others. Turned out it was just bad connections.
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I'll have to try it again later tonite. While testing, I had waited for the offset to come down (it had started much higher), but it seemed to have stabalized at the 10mV level. I didn't think that it would take that long for the capacitor to charge with no load.
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I do have a reasonable electronics shop, but the don't carry a single item that is SMD. Should I be seeing any offset on the output? From OL to OG, I'm seeing 11mv and from OR to OG, I'm seeing about 8mv. I did hook it up to my cmoy with input caps, so nothing on the output there, and sound is good from both channels.
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I didn't explore all the options for shipping but the last time I checked for Mouser they wanted $19US in shipping. DigiKey Canada is $8 flat rate, next day, no taxes or duty (they ship from Winnipeg). Thanks for the part number error401. I've got one or two items that I also want to get from DigiKey so it helps. Back to soldering the through holes items...
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thanks, error401. I'll work on getting one. The Glass Jar kit listed it as coming from Mouser and it is not as easy as ordering from DigiKey for Canada.
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Does anybody know if I could leave out C31? It looks as if it is just a filter capacitor for the regulator. It went flying out of the tweezers.