Battery or Accu Power supply

[ralf]

Hi all,

i hope that there is nothing about power supplies with CAR- batteries or accus.

I think at a 12, 0, 12 volt psu for ALEPH X.

i searched the forums, but found nothing.

I think that a big improvement of sound can be done with battery psu. Even more than with super expensive capacitors like RUBICON BLACK GATES.

Since i am no electronic expert i ask you all for schematics and suggestions. Why do one need in an accu psu such big capacitance?

When the accus are fully loaded, can one connect to an amp direct to the accu ore are the capacitors required anyway....

Regards,
Ralf

[rtirion]

Is it wise to want to feed an amplifier that draws at least 4
amperes all the time with batteries?
You will have a lot of work when you need to recharge them
every few hours of playtime.
Even if you decided to come up with a circuit that will handle the
charge job, (which is not a trivial task), you will have to ask
yourself if it is worth all the extra trouble/expenses.
Especcially if you know that there is a real good alternative in the form of an isolation transformer.
If you are going to use batteries I would shure like to read your experiences with them.

Regards.

[halojoy]

Can make a VERY good Source of Current
for an AUDIO amplifier.
It is usual to eastimate, that you can USE
half of the nominal VAh.
So for a 60VAh, you can use 30VAh, before reload.

It is fully possible to RUN some time during day.
And RELOAD, While you are sleeping at night.

Say you have 2 amps, draws 2x2A= 4A
Your battery is rated 60VAh, use half 30VAh
30 Vah is consumed in: 30VAh/4A= 7,5 hours

So if you drive 7,5 Hours (use timer ON/OFF)
You have 16,5 hours for to Reload, each night

No 50 Hz ripple from batteries,
No Transformator
No Rectifier-bridgde
No disturbance from Mains crap

2x12 volt (2x24 volts truck) Battery is a VERY good alternative!

As long as We do not have DC Currents coming out of the Wall Socket

There are millions of persons using this kinda systems.
The Car-Stereo People. They are the real Experts on HIFI.
they do not discuss mains-hum, and a lot of things that we have to cope with

[halojoy]

of AMPs for Battery Operation

Come ON!

All smart DiyAudio designers
and Nelson, too
if he likes to compete with his own other designs
for MAIN AC Current

[Duck-Twacy]

For Yachts you can buy extra large 24 V batteries (and a generator )

[Steve M]

ralf: The N.E.W DCA-33 (by Nirvana Engineering Works, USA, now defunct) is a 33w/ch Class A, battery powered pure d.c amplifier. It is supposedly based on the Nelson Pass A40 with a d.c power supply added. There is also a bigger N.E.W DCA-66 amplifier.

The DCA-33 is a beautiful, sweet sounding, high current, 'doubling' amp that will run continuously for 20hrs on it's 4 X 17AmpHr Panasonic batteries. The whole system is self-charging and fuss-free with the batteries lasting 3-4yrs before requiring replacement.

However, I'm not entirely sure that the benefits of pure d.c battery power are really worthwhile? I have not heard the NP A40 so cannot say the DCA-33 is far superior to it with it's battery supply. However, I have compared the Pass Aleph 3 with the N.E.W, and the little Pass amp is sweeter in the treble (although it is a close thing overall). The N.E.W however, delivers more current and outdrives the Pass. Surprisingly in one comparison, the N.E.W almost kept up with a Krell KAS200 for outright drive! Although the Krell did play louder, it definately did not have the finesse of the little battery powered N.E.W .

Also IMHO, as far as solid state amps go, the Belcanto EVo200.2 amplifier with it's Tripath Class-T digital circuitry is better than all of the above.

Regards,


Steve M.

PS: Before you ask, I do not have the circuit diagram for the N.E.W amps.

[halojoy]

Designed by Nelson Pass with very simple direct signal path, this pure class A battery powered amplifier has surprisingly high level of musicality for its price of $2000. The Rowland Model 2 with battery power supply is $8000. There is a purity and ease to the sound with excellent transparency. The bass is in a class totally by itself. For 33 watts this type of bass punch and kick is unheard of. The Model A20 was well respected for its bass punch and sweetness. The battery power DC-33 just elevates the performance to a whole other level

Must be something better priced, we could build.

[halojoy]

Schematic:

http://home.maine.rr.com/randylinscott/may98.htm

[Steve M]

halojoy: Please advise where you got the 'quote' for the DC-33 amp. I wouldn't mind reading it in it's entirety.

Thanks,

Steve M.

[halojoy]

Steve
That was all the reviewer, Terry Soohoo, wrote.
Very little I found on the web.
Just about all is these links at AudioWeb.
One review.
And some previous "for sale".
Simular difficulty to find Nirvana at the web.
Just an adress in Santa Fe.

http://www.audioweb.com/Review/Revie...&revieworder=1
http://www.audioweb.com/Directory/Mo...?modelid=10216
http://www.audioweb.com/Directory/Di...?companyid=457