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Old 2nd February 2013, 09:16 PM   #3621
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Would it be a problem if the supply voltage drifts a 1-2 volts either way during the operation??

For quite long time I have been planning to power class A amp off 4 large car batteries just for fun to see how it sounds. Initially I was to try it with Aleph J but maybe F6 would be also nice candidate.
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Old 2nd February 2013, 09:31 PM   #3622
Zen Mod is offline Zen Mod  Serbia
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just go for it

(but , if you ask me , choke input PSU is my poison ;
look at graphs HERE)
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Old 2nd February 2013, 09:43 PM   #3623
Maousse is offline Maousse  France
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ZM, zygibajt is not talking about PSU noise, but slow decrease of supply voltage as the batteries got depleted

I would say it's OK

BTW, Who is nuts enough to operate an A class amp on batteries ?
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Old 2nd February 2013, 09:45 PM   #3624
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Anybody want to give pointers on using visual analyzer to do distortion testing. I thought i had it figured out, but cannot get repeatable results.
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Old 2nd February 2013, 10:00 PM   #3625
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My friend works in car battery store that has a wide range of batteries from small motorcycle to huge ones for a trucks that two persons are needed to move few meters. Borrowing a few of them for a week, either some used or new is not a problem. But I seriously planned to buy four of them to power some Pass amps, especially since most of them use +/-24 supply lately. I just want to try it first to see: 1. How does it sound compared to regular PS, 2. How long it can operate for given battery capacity, 3. How long does it take to recharge them.
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Old 2nd February 2013, 10:12 PM   #3626
Maousse is offline Maousse  France
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Count something around 10A continuous , so 100 Ah is about 10 hours max of listening autonomy.

Lead-acid batteries don't like deep discharge and 10 amps is quite a lot, your batteries would age fast IMHO

My few cents
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Old 2nd February 2013, 11:10 PM   #3627
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lead-acid batteries must never discharge ,don't like cycle....
look for something new , yellow optima ?
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Old 2nd February 2013, 11:13 PM   #3628
Zen Mod is offline Zen Mod  Serbia
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Quote:
Originally Posted by Maousse View Post
ZM, zygibajt is not talking about PSU noise, but slow decrease of supply voltage as the batteries got depleted

I would say it's OK

BTW, Who is nuts enough to operate an A class amp on batteries ?
I know , but I wanna say that I choose "regular" PSU with choke input , rather than battery one

not from sanity reason

regarding in/sanity - who sane will choose to have several A class amps at home , even if needing just one ?

that's case with 75% of nutters around

L'art pour L'Art

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Old 2nd February 2013, 11:21 PM   #3629
labjr is offline labjr  United States
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787 Dreamliner batteries
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Old 3rd February 2013, 12:14 AM   #3630
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Thanks for the answers, sure I'm aware of all of it. I just wanted to try this idea for long time purely for fun and some new expirence.

Regarding the noise etc the batteries are neither perfect. I have read somewhere the deep study of noise of batteries even divided to few categories like lead/acid, Li-ion, Nim-cad etc and they all have their troubles.

Thanks again
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