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Old 16th October 2009, 03:05 PM   #11
mattmcl is offline mattmcl  United States
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Have you tried installing something else in the USB port on the computer, to make sure it's working? I've had USB ports go bad before and it's an easy thing to check.
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Old 16th October 2009, 04:49 PM   #12
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It's rarely a hardware problem, most likely it's related to software/interface. Some people experienced similar problems in a past, especially after sudden power disruption during a storm, etc.

Switch everything off, wait an hour or so, connect USB cable to a DAC and power on the DAC first. Then power on computer.

If you can't make it work, ship it to me and I will check it out.

For more info on system configuration, I recommend this link: The Art of building Computer Transports
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Old 16th October 2009, 06:12 PM   #13
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Yes, tried a couple other, different DACs, back to using one of them now.
Tried other USB ports.
Tried a different computer.
Tried power on to DAC first, computer off for an hour, a day, a couple days.

There have been sudden power disruptions from storms.
Maybe need a UPS for this circuit?

I'll ck out the website, & if I still can't figure out anything ship it to you (Peter),
Thanks again,
r
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Old 23rd October 2009, 02:11 PM   #14
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Default Spdf dac

Just today I received the SPDF dac and from the first hour it sounds marvelous...
I think that is the best DAC in my system since today!!..
It excels my Lavry DA 10 dac very easily in all points

Thanks again for this "best buy" product
Manolis
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Old 4th November 2009, 12:34 AM   #15
Tea-Bag is offline Tea-Bag  United States
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Have had my kit running for awhile. Lost the schematic,
Can someone tell me what resistor to put and where for the LED to work?

Thanks!
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Old 4th November 2009, 12:42 AM   #16
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Put the LED across one of those large black caps. It is approx 12V there and here's how to calculate the series resistor: LED calculator for single LEDs
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Old 1st December 2009, 02:09 PM   #17
HKC is offline HKC  Hong Kong
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Hi

I am currently using the USB Dac. I would like to know is there any way to keep the USB input but modify to balanced output as I am going to up grade my entire stereo system from single ended to balanced. Please advice.
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Old 1st December 2009, 03:06 PM   #18
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Yes, you can easily do that. Please see attached schematic posted by dddac, of course you don't need to use 12x TDA1543, but a single one:
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File Type: jpg dddac1543 with balanced output 3.jpg (47.0 KB, 1369 views)
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Old 1st December 2009, 10:45 PM   #19
HKC is offline HKC  Hong Kong
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Hi Peter

Thank you for posting the schematic. It is very interesting.
Do you have the link for me to take a look of the complete dddac article?

Best Regards
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Old 2nd December 2009, 12:40 AM   #20
HKC is offline HKC  Hong Kong
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Hi Peter

I got this schematic from the web it looks very similar to the one you posted but no output transformers. Please comment.
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File Type: gif RaDAC.gif (18.8 KB, 1253 views)
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