Battery-powered supplies

vic2 · 30th March 2003, 03:07 PM

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

Olle Bard · 30th March 2003, 04:57 PM

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.

carlosfm · 31st March 2003, 10:52 AM

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.

protos · 31st March 2003, 11:11 AM

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.

vic2 · 31st March 2003, 02:01 PM

I'm interested in using batteries for both preamp and power amp (gainclone). However, I might start out with a passive preamp.

Vic

protos · 31st March 2003, 02:39 PM

At least in my experience passive is ok but rather anaemic. An active pre is definitely better.

carlosfm · 31st March 2003, 02:40 PM

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.

vic2 · 1st April 2003, 09:58 PM

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

Guiness · 1st April 2003, 11:34 PM

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
Guiness

scrazy · 1st April 2003, 11:37 PM

battery charging kit from Taiwan

30th March 2003, 03:07 PM	#1
vic2 diyAudio Member Join Date: Mar 2003 Location: Michigan	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

30th March 2003, 04:57 PM	#2
Olle Bard diyAudio Member Join Date: Mar 2003 Location: Stockholm	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. __________________ I like turning knobs clockwise

31st March 2003, 10:52 AM	#3
carlosfm Banned Join Date: Mar 2003 Location: Lisbon, Portugal	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.

31st March 2003, 02:40 PM	#7
carlosfm Banned Join Date: Mar 2003 Location: Lisbon, Portugal	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.

1st April 2003, 09:58 PM	#8
vic2 diyAudio Member Join Date: Mar 2003 Location: Michigan	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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31st March 2003, 11:11 AM	#4
protos diyAudio Member Join Date: Mar 2002 Location: Rio de Janeiro,Brasil	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.

31st March 2003, 02:01 PM	#5
vic2 diyAudio Member Join Date: Mar 2003 Location: Michigan	I'm interested in using batteries for both preamp and power amp (gainclone). However, I might start out with a passive preamp. Vic

31st March 2003, 02:39 PM	#6
protos diyAudio Member Join Date: Mar 2002 Location: Rio de Janeiro,Brasil	At least in my experience passive is ok but rather anaemic. An active pre is definitely better.

1st April 2003, 11:34 PM	#9
Guiness diyAudio Member Join Date: Dec 2002 Location: USA	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 Guiness

1st April 2003, 11:37 PM	#10
scrazy diyAudio Member Join Date: Apr 2001 Location: Taiwan	battery charging kit from Taiwan

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