Battery-powered supplies

[vic2]

That's what I thought. Thanks.

[carlosfm]

Originally posted by Steve Eddy


What about more efficient loudspeakers?

se

Yes, that would be nice.
In my room I have a pair of Epos 11 speakers.
They are a little old, but I'm not thinking of changing them.
I just love their sound.
8 ohms, and around 87 db sensitivity.
It's not very sensitive, right, but damn, they play so well...

[JOE DIRT®]

ok I`ll repeat this...LOL....I use 4 batteries.....2 connected in series to get + and -24vdc.....they are panosonic rechargeble Gel-cells...measuring 5x2x3 inches......same ones that are used in UPS and emergancy lighting....all I did was build a auto sensing charging circuit to keep them topped up......they have been powering my pre amp for about 10 years....the pre amp has onboard +-20vdc regulators



Cheers!!The DIRT®

[Audiofanatic]

What?????? Ten Years???

Ten years............. WOW!
I heard from someone, that the cells will not last more than 2 or 3 years!

That's why I did not build it.

This is great news!

Thanks Joe

Audiofanatic

[Peter Daniel]

Originally posted by carlosfm


Peter,
With +/- 24 volts you'll get less than 30 watts from the LM3875...
What about 3 batteries per rail?

My speakers are 93dBs, so 30W should work fine. I also want to keep things simple and don't complicate the charging setup too much.

[carlosfm]

Originally posted by Audiofanatic
What?????? Ten Years???

Ten years............. WOW!
I heard from someone, that the cells will not last more than 2 or 3 years!

That's why I did not build it.

This is great news!

Thanks Joe

Audiofanatic

I'm going to tell you a story.
Once I needed a battery for my wife's car and I remembered I had a 32 amperes Gel battery that was given to me by a guy from a telephone company.
It was an Hitachi, if I remember.
The car had that battery, without one single problem, for around 8 years.
Then, here in Portugal they started the vehicle inspections and they made me change that battery, because it was not properly secured.
Unfortunately I was stupid enough to throw the battery away.

[Pan]

I bought a new Toyota Corolla -94 in 1994, it has +11.000.km behind it on the same battery, and I have no plans to change it yet

As a matter of fact I have never done anything but the ordinary service plus buying new tires ONCE. Talk about economic cars those japs.

/Peter

[Audiofanatic]

Hi Pan,

I know everything about the Toyota's!
I work at a Toyota dealer and to be honest, it's the best car in the world, most reliable one.

Thats why Wadia uses TEAC VRDS Transport's.

Audiofanatic

[vic2]

Joe Dirt:

Could you please post your schematic for your battery setup? If you use 2 12V batteries in series per side, wouldn't that give you +/- 12V with a ground in between? I appreciate your response.

Vic

[Da5id4Vz]

How bout a lawnmower powered gain clone?

http://theepicenter.com/tow082099.html

Please, dont hurt me. I just stumbled across this from a /. story... and well, non sequetors and mixed metaphors have always made me laugh.

But then, my wife often points out that my sense of humor is mostly for my own enjoyment.