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In Reply to: RE: battery-powered cMP ! posted by theob on January 25, 2011 at 08:40:23
While getting off ac mains is always desireable . . .
Designs such as John Swenson's choke-based PSUs (there are others) should give batteries a pretty good run for their money without the hassle. I forget who it was who said he was planning to try them on a cMP^2 rig.
I did hear from an inmate from, IIRC, Australia who built some and was delighted with them but, sadly, I don't think he's still on the list.
Batteries aren't necessarily as quiet as some think (though I can't speak about LiPo's - whatever they are). See e.g. link and also:
http://www.diyaudio.com/forums/chip-amps/13121-battery-powered-supplies-21.html#post187556
Follow Ups:
I'm sure the Swenson PSU is a very good one. My whole point was that there are better batteries than Lithion Ion. The LiFePo4 (lithium iron phosphate) batteries are a relative new discovery coming out of MIT in Boston. Variations of them are used in some hybrid vehicles now a days. My whole thing about batteries is that when used in critical digital circuits they protect the rest of the ac mains (not dumping digital noise into it) and are protected from noise on the mains best of both worlds. Yes they are a pita but Lipo's I use last 5-7 days on Juli@ and 7-9 days on the Buf32s before needing a charge. I run 3 3.3v 2.0amp rated batteries in parallel to get below 10 millohm output resistance (very fast response).
I'm sure there are excellent alternate solutions but if one is going to use batteries Lipo's are the ones.
Thanks for your responses guys,
My recent implementation did unfortunately cost the life of my motherboard (and maybe the lynx two-B card too. not confirmed yet).
the pico XT150 can certainly not be used in conjunction with a power hungry PCI card like the lynx. it seems that the lynx requires a -12V 150mA supply which the Pico does not provide....
so thatīs my main issue here : can this battery system be a serious alternative ?
more comments welcome !
cMP2 Computer (XP minlogon) Intel E7400 cPlay039>Allocator>Lynx Two B. /192kHz throughout. 2x AcousticReality Ref. 202 & 2x AcousticReality Ref. 601īs ICEpower. Magnepan MG3.3R beechwood frames & custom stands. Miller chokes on Ribbons.
I don't know the Lynx card but as you may know many of us here use the Juli@. The originator of the LiFePo4 battery idea (also used a TP Buffalo dac like I do) experimented with batteries on the digital circuit and the analogue circuit of both and said there was much more bang for the buck on using these batteries for the digital circuits. Its like the Linn philosophy: get it right at the source and pay less attention downstream. My experience has been exactly that with these LiFePo4 batteries. I would not use Lithium ion batteries though.
dear theob,
before we continue the discussion about which battery type is the better one (I take your statements on LiFePo4 for granted), could you explain how these batteries have been implemented into the power regime of the computer in question ?
I think we are a bunch of cMP fans who would like to explore all the ways of making high quality power supply possible.
apart form the few tweaks, the pico way and mikhailovīs linear supply itīs very much it....
since the lynx two-B card I use is a 6 analog-out DAC, itīs obviously requiring not only ripplefree power, but also quite a lot of it ....:-)
(sadly more than the PICO can handle)
I think the device that Ocean Server is offering could be a solution to a lot of us....sort of a step up from the PICO, and I would like we could discuss this offering and itīs eventual advantages and drawbacks.
the question is : does it seem a viable solution for cMP?
cMP2 Computer (XP minlogon) Intel E7400 cPlay039>Allocator>Lynx Two B. /192kHz throughout. 2x AcousticReality Ref. 202 & 2x AcousticReality Ref. 601īs ICEpower. Magnepan MG3.3R beechwood frames & custom stands. Miller chokes on Ribbons.
I'm just telling you my experience with Lithium ion batteries there is no obligation to listen to me. Try it and let us know how it worked out. Mikhailovīs linear supply is not a trivial tweak it is a serious attempt.The way I use these batteries are only for the 3.3v digital section of the juli@ soundcard period. I also use batteries on the 3.3 v digital section of my Buf32s DAC.
In my cmp I use 2 ATX power supplies for my pc (one for p24 and one for all else). I tried a linear supply for p4 and that was a pretty good mod but I don't feel the need to go back there after the 2 ATX supplies. I use the Ryelands p4 capacitor bank mod plus the juli@ 5v cap mod of Promethk.
Edits: 01/26/11
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