One dim led on the AVCC Dual 3.5V Shunt Regulator Module Options  Watch this topic  Print this topic  Atom Feed  RSS Feed View » Normal Threaded

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opnordahl		#1 Posted : Sunday, September 29, 2013 7:47:20 PM(UTC)
Rank: Member Groups: Member Joined: 1/31/2009(UTC) Posts: 18 Location: Norway		One of the LEDs (D1) on the AVCC Dual Shunt Regulator Module is much dimmer than the other (Buffalo II). Is this something to worry about? The DAC seems to work fine. Edited by user Sunday, September 29, 2013 8:03:30 PM(UTC)  | Reason: Not specified
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avr300		#2 Posted : Sunday, September 29, 2013 8:09:45 PM(UTC)
Rank: Member Groups: Member Joined: 6/17/2008(UTC) Posts: 921 Thanks: 1 times Was thanked: 70 time(s) in 69 post(s)		Probably not. You could try measuring input voltage along with output voltages. Be careful not to let the probe slip creating a short.
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opnordahl		#3 Posted : Sunday, September 29, 2013 8:13:28 PM(UTC)
Rank: Member Groups: Member Joined: 1/31/2009(UTC) Posts: 18 Location: Norway		I measured the out pins and both measure exaxtly 3.5V (AVCC)
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Russ White		#4 Posted : Monday, September 30, 2013 1:46:10 PM(UTC)
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)		What is your VD voltage?
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opnordahl		#5 Posted : Tuesday, October 1, 2013 5:11:54 PM(UTC)
Rank: Member Groups: Member Joined: 1/31/2009(UTC) Posts: 18 Location: Norway		The VD is 5.28V (Cold) and 5.22 V (Warm) The shunt current is 60mA in the Placid HD. I have experienced some locking problems/noise with the Buffalo II at 384 kHz 32bit. I do not experience this with the BIII. (I use a 100MHz clock on BII.) The I2S cables are only about 1 inch long. I do not know if this is related to the dim led. Edited by user Tuesday, October 1, 2013 5:13:01 PM(UTC)  | Reason: Not specified
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opnordahl		#6 Posted : Monday, October 7, 2013 7:34:34 PM(UTC)
Rank: Member Groups: Member Joined: 1/31/2009(UTC) Posts: 18 Location: Norway		Any idea if I should do anything?
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Russ White		#7 Posted : Tuesday, October 8, 2013 12:08:02 AM(UTC)
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)		You could increase the VD a bit - but if its working fine, then there is no issue.
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opnordahl		#8 Posted : Sunday, October 13, 2013 6:57:31 PM(UTC)
Rank: Member Groups: Member Joined: 1/31/2009(UTC) Posts: 18 Location: Norway		I see that there are others having the same issue with the SRA1 version of the AVCC Dual 3.5V Shunt Regulator Module. See: http://hifiduino.wordpress.com/2012/12/02/got-my-avcc-2-1-shunt-supply-from-tpa/ Maybe I could simply try to upgrade the AVCC to version SRA2.1?
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Faxe		#9 Posted : Sunday, October 13, 2013 11:35:50 PM(UTC)
Rank: Member Groups: Member Joined: 10/11/2013(UTC) Posts: 6 Location: Gentofte		Is it possible buy the new opamp for the AVCC ?
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avr300		#10 Posted : Monday, October 14, 2013 7:08:27 AM(UTC)
Rank: Member Groups: Member Joined: 6/17/2008(UTC) Posts: 921 Thanks: 1 times Was thanked: 70 time(s) in 69 post(s)		Sure, but not from TPA. Look for OPA2209 or OPA2211
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