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avr300  
#1 Posted : Tuesday, July 28, 2009 3:40:06 PM(UTC)
avr300

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Setup: Buf24 ver. 1.2

Volumite with new firmware, see http://www.twistedpearau...t.aspx?g=posts&t=736

Problem:
I'm having a faint "tic-tic-tic" constantly. I think it's the Sabre controlling the volume. It's faint, but it's there.

Checking the SDA line, I can see, that there's a continuously data transfer, even without me turning the pot. Why's that. I mean, when the volume registry is set, it's set.

When the 85 is removed from it's socket, the DAC is 100% quiet. So it's def. the Volumite that's causing the issue.
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Russ White  
#2 Posted : Tuesday, July 28, 2009 4:16:08 PM(UTC)
Russ White

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That very likely is an issue with the routing of your I2C lines to the DAC.

YOu need to be very careful routing the lines so as not to pick up EMI. Keep them away from PS lines.
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avr300  
#3 Posted : Tuesday, July 28, 2009 4:20:19 PM(UTC)
avr300

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I have to understand this. You mean, that the I2C lines picks up EMI, causing the Sabre to "jitter" the volume ?
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Russ White  
#4 Posted : Tuesday, July 28, 2009 4:55:15 PM(UTC)
Russ White

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No, the I2C lines are digital signals which can produce EMI. So you need to keep them away from analog signals and power supply wires.
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avr300  
#5 Posted : Friday, July 31, 2009 4:17:17 AM(UTC)
avr300

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I did a layout rearrangement and this has cured the problem. Tnx. Russ.
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Russ White  
#6 Posted : Friday, July 31, 2009 6:35:19 AM(UTC)
Russ White

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Very glad to help. :)
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