[Voyage-linux] Any Hardware Voltage Monitoring/Usage Sensors Available for ALIX boards?

[Jeff Mai]

The Alix 2d2 schematic shows a 5V linear regulator directly after the
DC input jack.  If you feed the Alix with a 15V external supply, this
regulator probably dissipates as much as 2-3 Watts as heat
There is a separate supply for the USB power that looks like a DC - DC
converter.  It will be more efficient, but noisier.

 I found I could run my board with as little as 9V input, but it
depended on the USB equipment attached.  My HagUSB converter worked
fine, but the Audiophilleo 1 did not.  
Your Ayre DAC is certainly not going to use USB power from the Alix.
 I think you could get away with 9V - maybe less.
Make sure you create a copy of your CF card before dialing down the
input voltage to the Alix.  I didn't and after one crash due to a
power drop out I had to reload Voyage on to the card to get the Alix
to boot.  

Cheers,Jeff

 ----- Original Message -----
From: "linux123" 
To: voyage-linux at voyage.hk
Cc: 
Sent: Sun, 22 Jan 2012 13:15:08 -0800 (PST)
Subject: [Voyage-linux] Any Hardware Voltage Monitoring/Usage Sensors
Available for ALIX boards?
 Hello,

 I am using Voyage Linux MPD Version: 0.8 (Build Date 20111030) with
an Alix
 2D2 board for my music server which connects to an Ayre QB9 external
USB
 DAC. I was wondering if there are any ways to view/ monitor actual
power
 usage of the ALIX board via software based sensors included with this
Linux
 distribution or thru add ons? I saw that there were some basic Temp
sensors
 available but nothing about power usage..etc

 My primary reason for seeking this information is that I am powering
my Alix
 board with a laboratory grade benchtop linear power supply that is
variable
 from 0-30v. At the moment I am feeding it a little over 15.5v & .33mA
but
 can't tell how much of that power it is actually using without
breaking out
 a volt meter/clamp. Its not the end of the world if I have to do it
this way
 but thought it would be much easier if it could be done via software
 instead. My goal is to feed the board exactly what it needs to run
and
 supply power for the USB port and not a spark more as to keep
electrical
 noise/interference to a minimum.

 Thanks for your time and any info you can provide.

 --
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