Welcome Guest! To enable all features please Login or Register.

Notification

Icon
Error

Login
Noise from Vol.
Options
View
Go to last post Go to first unread
Previous Topic Next Topic
avr300  
#1 Posted : Tuesday, July 28, 2009 3:40:06 PM(UTC)
avr300

Rank: Member

Groups: Member
Joined: 6/17/2008(UTC)
Posts: 921
Denmark

Thanks: 1 times
Was thanked: 70 time(s) in 69 post(s)
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.
Back to top

Wanna join the discussion?! Login to your Twisted Pear Audio Support forum accountor Register a new forum account.
Back to top  
Russ White  
#2 Posted : Tuesday, July 28, 2009 4:16:08 PM(UTC)
Russ White

Rank: Administration

Groups: Administration, Customer
Joined: 10/24/2006(UTC)
Posts: 3,979
Location: Nashville, TN

Thanks: 25 times
Was thanked: 89 time(s) in 83 post(s)
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.
Back to top
WWW
avr300  
#3 Posted : Tuesday, July 28, 2009 4:20:19 PM(UTC)
avr300

Rank: Member

Groups: Member
Joined: 6/17/2008(UTC)
Posts: 921
Denmark

Thanks: 1 times
Was thanked: 70 time(s) in 69 post(s)
I have to understand this. You mean, that the I2C lines picks up EMI, causing the Sabre to "jitter" the volume ?
Back to top
Russ White  
#4 Posted : Tuesday, July 28, 2009 4:55:15 PM(UTC)
Russ White

Rank: Administration

Groups: Administration, Customer
Joined: 10/24/2006(UTC)
Posts: 3,979
Location: Nashville, TN

Thanks: 25 times
Was thanked: 89 time(s) in 83 post(s)
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.
Back to top
WWW
avr300  
#5 Posted : Friday, July 31, 2009 4:17:17 AM(UTC)
avr300

Rank: Member

Groups: Member
Joined: 6/17/2008(UTC)
Posts: 921
Denmark

Thanks: 1 times
Was thanked: 70 time(s) in 69 post(s)
I did a layout rearrangement and this has cured the problem. Tnx. Russ.
Back to top
Russ White  
#6 Posted : Friday, July 31, 2009 6:35:19 AM(UTC)
Russ White

Rank: Administration

Groups: Administration, Customer
Joined: 10/24/2006(UTC)
Posts: 3,979
Location: Nashville, TN

Thanks: 25 times
Was thanked: 89 time(s) in 83 post(s)
Very glad to help. :)
Back to top
WWW
Rss Feed  Atom Feed
Users browsing this topic
GuestUser (4)
Forum Jump  
You cannot post new topics in this forum.
You cannot reply to topics in this forum.
You cannot delete your posts in this forum.
You cannot edit your posts in this forum.
You cannot create polls in this forum.
You cannot vote in polls in this forum.

Youtube
Copyright © Twisted Pear Audio