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Old 30th March 2003, 02:07 PM   #1
vic2 is offline vic2  United States
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Default Battery-powered supplies

I'd like to propose a new thread on battery power.

In this forum, we could design a nice DIY automatic charging unit. Perhaps even a hybrid power supply?

National Semiconductor, www.national.com, has some chips for battery chargers.

Vic
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Old 30th March 2003, 03:57 PM   #2
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camn you run a car-battery loader as power supply?
if you can this is a way to get a ps really cheap, and the loading currents arn`t small in those things either.
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Old 31st March 2003, 09:52 AM   #3
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Question PSU for...

Vic, what do you whant that PSU for?
It's important to know what are you going to use it for.
Preamp? Power amp? Dac?
Knowing that is essential to choose the appropriate batteries, charger, etc.
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Old 31st March 2003, 10:11 AM   #4
protos is offline protos  Greece
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It seems there are certain complexities in regard to battery charging(constant current, constant voltage, float charging , trickle charging, two-stage, three-stage etc) and I would be very happy if somebody pointed to where I can get some info on all this.
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Old 31st March 2003, 01:01 PM   #5
vic2 is offline vic2  United States
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I'm interested in using batteries for both preamp and power amp (gainclone). However, I might start out with a passive preamp.

Vic
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Old 31st March 2003, 01:39 PM   #6
protos is offline protos  Greece
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At least in my experience passive is ok but rather anaemic. An active pre is definitely better.
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Old 31st March 2003, 01:40 PM   #7
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Lightbulb Battery chargers

Protos,

You can check here:

http://www.web-ee.com/primers/primers_frm.htm

Then click on (or download the pdf) "Battery chargers".
On this page there's plenty to read.
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Old 1st April 2003, 08:58 PM   #8
vic2 is offline vic2  United States
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Default Batteries

I did some searching on the web. You can pick up 12V 7Ah batteries for about $20 apiece. Four of these would give 24 volt rails per side. That's $80. Then a charging system is needed. I'm still looking for an economical solution. I think that this is relatively inexpensive compared to buying the transformers and capacitors needed to make a quality power supply.

If Peter Daniel is listening, I know you use high quality caps in your stuff. Any thoughts?

Vic
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Old 1st April 2003, 10:34 PM   #9
Guiness is online now Guiness  United States
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Default Batteries? Hell Yeah!

I really like this idea of using batteries. I have used them alot in powering tube ampiliers, especially DHT. I am fond of the Panasonic LC-R127R2P (12V 7.2A) You would only need to put 2 in series for a single channel or 4 for a stereo jobber. So my question is how much current does the gainclone draw? How long would a setup using these batteries play? Also when using batteries do you still need the 1000uf caps and diodes? I hope Peter is using these same batteries on his setup and will tell us how they worked out. I Personally think car batteries would be a huge overkill. IMHO
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Old 1st April 2003, 10:37 PM   #10
scrazy is offline scrazy  Taiwan
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battery charging kit from Taiwan
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