Fluttering noise from TDA1543/CS8412 DAC - diyAudio
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Old 15th February 2005, 09:53 PM   #1
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Default Fluttering noise from TDA1543/CS8412 DAC

As the end of each track fades out I get a fluttering, hissing sound in the left channel, until the track stops. There's no noise on the "dead space" between tracks. I also get a weird kind of distortion, like pops and clicks.

I don't think anything's broken, as swapping chips doesn't change anything.

Something to do with grounding, perhaps?

My DAC's in a 3D layout a la Peter Daniel, with all grounds soldered to a piece of copper foil glued on top of the CS8412. I use LM317 regs and passive resistor output.

Any suggestions?

TIA
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Old 15th February 2005, 11:04 PM   #2
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Bad cap ?
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Old 15th February 2005, 11:14 PM   #3
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Or bad connection?
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Old 16th February 2005, 02:35 PM   #4
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I don't think caps are the problems, as I've had the same problem with different types of cap.

As for a bad connection, are there any in particular to check?

TIA
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Old 16th February 2005, 02:41 PM   #5
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You have it p2p? Otherwise you might try to change the chip.

I would check I/V resistors and output caps first.
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Old 17th February 2005, 06:30 PM   #6
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Resoldered the I/V resistors, +V and coupling caps.

No joy. Any ideas?

TIA
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Old 17th February 2005, 06:31 PM   #7
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At this stage, I might change the DAC chip (if this happens in one channel only).
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