Alf
100+ Head-Fier
- Joined
- Dec 28, 2004
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Quote:
My understanding is that the chip attenuator is controlled by the driver via USB. The volume is not hard coded in the chip. You move the volume slider in your OS/driver, the chip setting changes. I assume you have played with the slider already. What happens if you move the slider up and down? Do channels still sound different? Do you use Windows?
If you are confident about your soldering and your software settings, then I think the broken chip is the only possibility. Contacting TI would be an interesting option too. I would like to hear what they have to say on the subject.
Originally Posted by t52 some more info on my problem: the dc offset on both channels is the same within 1mV, i also checked with a dmm in the 200kohms range from output to ground (before output caps) and measured 2x ~90kohms, also identical (dac off). i also looked at the output with my old scope (built 1969, all tubes) which is not very precise, but both outputs show a nice sine wave form when fed with a 1khz mono sine signal... it's just that one channel's amplitude is lower. could it have something to do with the digital attenuator in the chip (probably being programmed to some value on one channel)? i don't even know if the attenuator can be set explicitely for one channel only. nor do i know how to set it at all, can someone shed some light on this or should i contact ti about this? if it's not a "software" problem, i probably have a broken chip here... |
My understanding is that the chip attenuator is controlled by the driver via USB. The volume is not hard coded in the chip. You move the volume slider in your OS/driver, the chip setting changes. I assume you have played with the slider already. What happens if you move the slider up and down? Do channels still sound different? Do you use Windows?
If you are confident about your soldering and your software settings, then I think the broken chip is the only possibility. Contacting TI would be an interesting option too. I would like to hear what they have to say on the subject.