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glt  
#1 Posted : Saturday, March 20, 2010 10:57:41 PM(UTC)
glt

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I suppose the Shunt regulator is the same on both sides so that it can be installed back to back on the back side of Buffalo II like this?:

UserPostedImage
Russ White  
#2 Posted : Sunday, March 21, 2010 9:06:50 AM(UTC)
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Just observe that the pin names on the DAC match up to the correct pin names on the regulator. Both halves of the AVCC cct work identically.

Out -> AVCC
Gnd -> Gnd
IN -> VD
No-MARK -> DVCC

Notice that while you use a 4 pin header that DVCC is not actually used by this regulator.

Your picture has the AVCC module oriented correctly.

Edited by user Sunday, March 21, 2010 9:47:56 AM(UTC)  | Reason: Not specified

glt  
#3 Posted : Sunday, March 21, 2010 5:03:19 PM(UTC)
glt

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Russ (and Brian),

Thanks. Installed the shunt on the back side.
Powered the DAC with 5.0V
Measured the voltage of the shunt, one side is 3.523 v the other side 3.516v
One of the LEDs of the shut is brighter than the other
Like this:
UserPostedImage
I suppose this is perfectly normal

PS: the built quality of Buffalo II is very very good...

Edited by user Sunday, March 21, 2010 5:24:09 PM(UTC)  | Reason: Not specified

Russ White  
#4 Posted : Sunday, March 21, 2010 6:38:41 PM(UTC)
Russ White

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That's normal, but I would use 5.5V as stated in the manual.
glt  
#5 Posted : Sunday, March 21, 2010 7:10:34 PM(UTC)
glt

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OK.

Powered with 5.5V

AVCC: 3.556 and 3.554
Both LEDs are more uniform in brightness

Also, the GND plane must be very substantial as I couldn't solder the GND pin with a 25W iron. Had to use the 40W iron.
Russ White  
#6 Posted : Sunday, March 21, 2010 8:23:14 PM(UTC)
Russ White

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Yes the GND plane is pretty much a solid sheet of copper :) but there are thermals, so soldering should be OK.
glt  
#7 Posted : Sunday, March 21, 2010 10:29:19 PM(UTC)
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Didn't want to cover up the ESS chip :-) and this way it is a bit lower profile.
Russ White  
#8 Posted : Monday, March 22, 2010 4:27:28 PM(UTC)
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Sure, perfectly reasonable. :) Should work great either way. , just watch clearances if you use the IVY-III.
qusp  
#9 Posted : Tuesday, March 23, 2010 6:55:38 AM(UTC)
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yeah I considered doing something like that too, considering the final home for the b32v2 is going to be a portable case, but I checked and when installed the shunt sits at about 2mm higher than the height of the oscons anyway, so I deemed it not worth it. I guess you still skip the pin header connection and 5mm length, but I doubt its meaningful. looks cool though. I wanted the ability to 'unplug' the shunt rather than desoldering it if I find (or one is released) a higher performance reg for each of the positions

Edited by user Tuesday, March 23, 2010 6:57:17 AM(UTC)  | Reason: Not specified

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