Fluttering noise from TDA1543/CS8412 DAC

kittaylor · 15th February 2005, 08:53 PM

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

jean-paul · 15th February 2005, 10:04 PM

Bad cap ?

Peter Daniel · 15th February 2005, 10:14 PM

Or bad connection?

kittaylor · 16th February 2005, 01:35 PM

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

Peter Daniel · 16th February 2005, 01:41 PM

You have it p2p? Otherwise you might try to change the chip.

I would check I/V resistors and output caps first.

kittaylor · 17th February 2005, 05:30 PM

Resoldered the I/V resistors, +V and coupling caps.

No joy. Any ideas?

TIA

Peter Daniel · 17th February 2005, 05:31 PM

At this stage, I might change the DAC chip (if this happens in one channel only).

15th February 2005, 08:53 PM	#1
kittaylor diyAudio Member Join Date: Apr 2004 Location: Here	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

15th February 2005, 10:04 PM	#2
jean-paul diyAudio Moderator Emeritus Join Date: Sep 2002 Location: The Netherlands	Bad cap ? __________________ It's only audio

15th February 2005, 10:14 PM	#3
Peter Daniel diyAudio Member Join Date: Jul 2002 Location: Toronto, Canada	Or bad connection? __________________ www.audiosector.com “Do something really well. See how much time it takes. It might be a product, a work of art, who knows? Then give it away cheaply, just because you feel that it should not cost so much, even if it took a lot of time and expensive materials to make it.” - JC

16th February 2005, 01:41 PM	#5
Peter Daniel diyAudio Member Join Date: Jul 2002 Location: Toronto, Canada	You have it p2p? Otherwise you might try to change the chip. I would check I/V resistors and output caps first. __________________ www.audiosector.com “Do something really well. See how much time it takes. It might be a product, a work of art, who knows? Then give it away cheaply, just because you feel that it should not cost so much, even if it took a lot of time and expensive materials to make it.” - JC

17th February 2005, 05:31 PM	#7
Peter Daniel diyAudio Member Join Date: Jul 2002 Location: Toronto, Canada	At this stage, I might change the DAC chip (if this happens in one channel only). __________________ www.audiosector.com “Do something really well. See how much time it takes. It might be a product, a work of art, who knows? Then give it away cheaply, just because you feel that it should not cost so much, even if it took a lot of time and expensive materials to make it.” - JC


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16th February 2005, 01:35 PM	#4
kittaylor diyAudio Member Join Date: Apr 2004 Location: Here	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

17th February 2005, 05:30 PM	#6
kittaylor diyAudio Member Join Date: Apr 2004 Location: Here	Resoldered the I/V resistors, +V and coupling caps. No joy. Any ideas? TIA

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