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| Computer Audio Discussion of computers as source components, sound cards, USB DACs, media servers, etc. |
03-24-2005, 10:12 AM
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100+ Head-Fi'er
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Join Date: Nov 2004
Location: Swansea, Wales, UK!
Posts: 434
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Mini-ITX on Battery power?
I'm thinking about knocking up a Mini-ITX pc in an old Technics CD player I have, drop in my damaged 0404 and use the digital out to a DAC.
Making the remote control/frontpanel buttons work is easy, maybe I can work the display too. There would be a TV next to the rack so it can be plugged into that for user interface. I'm going fanless/diskless, either network boot or IDE Flash / CF, hopefully I can make a cdrom fit the case.
Anyway, these boards need little power and there are many dc-dc convertors on offer that only require a 12v regulated feed.
Does anybody think powering this via batteries might yield improvements? (we always talk about dirty pc power hampering the soundcards!)
Does the dc-dc convertor add its own 'nastiness' to the supply?
__________________
Source: Guzzler USB Dac / HP Dac / EMU 0404 (LT1364) / Shuffle 1gb / PD Premium TDA1543 Dac
Amp: Mint (OPA2227) / Pimeta (OPA637BP) / M³ (AD843) / Beta 22 / PD LM3875 Gainclone
Cans: Shure E3C / HD-580 / HD-650 with Canare Cable
IC: Starquad 9pin > RCA / VanDamme SPOFC /w HGA LOK Plugs
AV: 4 x KEF Q1 + Q9C
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03-24-2005, 02:42 PM
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Headphoneus Supremus
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Join Date: Jan 2005
Location: CT, USA
Posts: 1,755
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i doubt that you will be able to run it for very long. however most of them take dc in (vs AC in on desktops) so you could use a nice regulated wallwart or even tangents STEPS to power it ( i doubt that there would be much "dirt power" if you powered it from tangents steps) 
if im wrong please correct me, i havent looked at any of the boards recently 
__________________
192 vbr mp3->AV710-> Blueberry Audio Emotion+ / Millet Hybrid ->HF-1 #47/ SR-60 (recabled with Silver) / DT880
Ipod / Karma -> Go Vibe-> Shure E2C / ER4-P w/ Xin 75 ohm Adapter
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03-24-2005, 06:31 PM
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Contributor  Headphoneus Supremus Thought the last line in Citizen Kane was "nosebud."
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Join Date: Jun 2001
Location: Back to Munich - bye Hannover!
Posts: 5,943
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Well, I you have a love for car batteries, you could give it a go. Not that it would make much sense to feed very clean power to a computer board full of switching transistors, imo - but then again, maybe it does...
Greetings from Hannover!
Manfred / lini
__________________
No p/hun intended! :D
Bavarian headphone barbarian and professional computer journalist, suffering from bad consumer electronics collectitis. ;)
Favs: AKG K240S - "The new Groovalizer" as well as Beyerdynamic DT531 & DT440 - "The old Groovalizer" & "The Funkalizer"
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03-24-2005, 08:39 PM
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Junior Head-Fi'er
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Join Date: Mar 2005
Posts: 11
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People think that just because an ITX board is small, it draws little power. Wrong, this will kill a laptop battery in a matter of minutes. And in defense to PC's, the ATX standard is set so the rails cannot have a fluxiation of + .05 volts. And as for the amperage, trust me, you can run several ITX boards off a single PSU, just don't buy the no-name brand crap.
And as for any further ITX questions, try this site
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03-25-2005, 12:40 AM
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100+ Head-Fi'er
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Join Date: Nov 2004
Location: Swansea, Wales, UK!
Posts: 434
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So a laptop draws less power than a VIA Mini ITX? Do you have some figures?
http://resources.mini-box.com/online...simulator.html
That gives me 10-20w for the low end EPIA.
The battery is just an idea, I was planning to use STEPS or something similar unless there was a major benefit.
__________________
Source: Guzzler USB Dac / HP Dac / EMU 0404 (LT1364) / Shuffle 1gb / PD Premium TDA1543 Dac
Amp: Mint (OPA2227) / Pimeta (OPA637BP) / M³ (AD843) / Beta 22 / PD LM3875 Gainclone
Cans: Shure E3C / HD-580 / HD-650 with Canare Cable
IC: Starquad 9pin > RCA / VanDamme SPOFC /w HGA LOK Plugs
AV: 4 x KEF Q1 + Q9C
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