F5 on batteries

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#23
tinitus, a fliament choke will work, but so will a variety of other things that are wound around a nice core...

bigfishe - the one you build? 😀
Or those big lithium batteries that Umut has seen? 😀

The good thing is that the F5 is very good even with a not so special supply, although soft recovery rectifiers may be useful. See the F5 thread for various ideas...

_-_-bear
 
#24
AndrewT said:
ClassA biased to 1.3A per rail run from a battery is just silly.
I won't take it back no matter what other perceived or alleged sound quality improvements may accrue.
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Hi Andrew,

Much of what we do in audio can be perceived as silly. It does seem somewhat absolutist to say that no matter what improvements it is not worth it. What if it doubled your enjoyment of your system? Wouldn't it be worth it then? (Not saying it does, but what if)

Nelson Pass had a small blurb regarding batteries from this article http://www.firstwatt.com/pdf/art_power_supplies.pdf
"Battery Operation
Just about total isolation. Near zero noise. Costs a mint."

The F5 biased at 1.3A/device x 4=5.2A. On a 100 Amp Hour battery supply you would have up to 19 hours. You could also use a solar recharger during the day if you wanted to be green.
 
#30
you can buy the large cells made by A123, but not the ones that are gaining such a reputation on here for running dacs and such (and rightly so), they beat every regulator I have put them up against so far, with 8 mOhms output impedance and 60amps with double that in bursts. but yeah the ones we use were developed for power tools, A123's main business is for cars (thus last 1/4's profits were absolutely through the roof), screw SLA; by comparison are massive and noisy with crappy internal resistance/output impedance and utterly useless power delivery compared to lifepo4 chemistry. the A123 M1 cells i'm using are 3v3 nominal @ 2200mah and can be fast charged in a few minutes; literally. as a bonus, they are very safe, lipos however, not so much. with lipos without proper safety for under/overcharge can bring new meaning to the phrase 'and the bass goes boom!!'
 
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#32
I cant remember the site, but all batteries have their own noise from the chemical reaction; there are some reactions are more noisy than others. I do wish there was more of this kind of information around, but because battery manufacturers are not usually specifying their product for use in audio, its often difficult to find any of the information that we would normally look for in a power supply. I will have to look up my history and see if I can find it.

that being said ive heard some great stuff powered by SLA, but I would never build with it mainly due to the size. if i'm going to power something with batteries, its a bit of a PITA, so I want the pay off to be large, I dont want noise performance that can be bettered by a nice regulator, so apart from portable gear I havent really looked into it seriously before now, and now i'm starting a rethink on several projects due to the results i'm getting so far with LiFePo4
 
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