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Head-Fi - Alien DAC Construction Thread
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Its ALIVE! Thanks everyone for your fantastic help. It is working but I am noticing some static in the sound, when using the touch pad or a usb mouse. I got about 15 hours on the alien so far and I am impressed. I found that the static issue was only in win xp pro sp2, so I installed vista and have no issues so far..........
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You guys ROCK! I removed c31, cleaned it up, reattached it and the regulator and bam, I got 3.3v on the 3.3v pad. I'm out of desolder braid, so I gotta run to the store and get some to re attached everything else. Cross your fingers but I think we are headed in the right direction. Thanks again guys, and I will update soon.
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I misspoke. My meter reads 0L meaning it does not react at all when connected to pin3 and pin4 of ic2.
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ic2 pin3 to pin4 measures 0L ohms without c22 installed (meter does not react) ic3 pin3 to pin4 measures 9.664k ohms with r32 installed between g1 and one pad for l12 i measure .15 ohms between g1 and the other pad for l12 i measure 8M ohms and rising ok, did some more probing without ic2 and ic3 installed. I measure continuity between av+ and pins 5-8 on ic2…
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Ok, I removed the voltage regulators, l12, and c22 to check for bridges. I found none. FallenAngel, yes I have checked for voltage on the 3v and 5v pad with both 9v battery and usb connections and both read 0 volts. Anything I can check while the voltage regulators are off to eliminate them as the issue? Resistance between 3.3v and g1 starts at 400k ohms and drops, the resistance…
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hooked to 9v alkaline with s1 jumpered i measure 0v and the only thing that gets warm is the battery. By the way, thanks for the help.
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I have not soldered on the pcm2702 at all, it was pre soldered. I tried a 9v as you said and i measure 0v between the 3.3 and 5v pads and g1.
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I re flowed all the joints on the pcb. I still have the same error when connected to xp pro sp2 machine and no voltage. When I hook to a vista home premium machine no errors or pop ups and no voltage. Also L12 gets very very hot when connected to computer! do the ic2 and ic3 regulators look like the are in the correct position. I also don't have outputs soldered on yet and assume…
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Here are some pictures. Maybe someone can spot the issue.
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I get this immediately upon connection to usb. No voltage. I tried taking pics of pcb, but my old camera won't take a good picture of the small board.
