<html><body>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<div><br /></div><div>There is a separate supply for the USB power that looks like a DC - DC converter. It will be more efficient, but noisier.<br /><br /> 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. </div><div><br /></div><div>Your Ayre DAC is certainly not going to use USB power from the Alix. I think you could get away with 9V - maybe less.</div><div><br /></div><div>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. <br /><br />Cheers,</div><div>Jeff<br /><br />
----- Original Message -----<br /><div class="replyForwardedMainHeader"><div class="replyForwardedMessageHeaders">From:</div> "linux123" <24bits@comcast.net></div><br /><div class="replyForwardedMessageHeaders">To:</div> voyage-linux@voyage.hk<br /><div class="replyForwardedMessageHeaders">Cc:</div> <br /><div class="replyForwardedMessageHeaders">Sent:</div> Sun, 22 Jan 2012 13:15:08 -0800 (PST)<br /><div class="replyForwardedMessageHeaders">Subject:</div> [Voyage-linux] Any Hardware Voltage Monitoring/Usage Sensors Available for ALIX boards?<br />
Hello,<br /><br />
I am using Voyage Linux MPD Version: 0.8 (Build Date 20111030) with an Alix<br />
2D2 board for my music server which connects to an Ayre QB9 external USB<br />
DAC. I was wondering if there are any ways to view/ monitor actual power<br />
usage of the ALIX board via software based sensors included with this Linux<br />
distribution or thru add ons? I saw that there were some basic Temp sensors<br />
available but nothing about power usage..etc<br /><br />
My primary reason for seeking this information is that I am powering my Alix<br />
board with a laboratory grade benchtop linear power supply that is variable<br />
from 0-30v. At the moment I am feeding it a little over 15.5v & .33mA but<br />
can't tell how much of that power it is actually using without breaking out<br />
a volt meter/clamp. Its not the end of the world if I have to do it this way<br />
but thought it would be much easier if it could be done via software<br />
instead. My goal is to feed the board exactly what it needs to run and<br />
supply power for the USB port and not a spark more as to keep electrical<br />
noise/interference to a minimum.<br /><br />
Thanks for your time and any info you can provide.<br /><br />
--<br />
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