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
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
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.
if you can this is a way to get a ps really cheap, and the loading currents arn`t small in those things either.
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.
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.
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.
I'm interested in using batteries for both preamp and power amp (gainclone). However, I might start out with a passive preamp.
Vic
Vic
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.
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.
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
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
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
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
hmm
yes i saw the guts of a mark levinson amp that had batteries
it sounded great thay were sealed led acid. like the one's in ups's.
car batteries and motorcycle cells give off a gas that is really explosive not a good thing around eletronics😉
yes i saw the guts of a mark levinson amp that had batteries
it sounded great thay were sealed led acid. like the one's in ups's.
car batteries and motorcycle cells give off a gas that is really explosive not a good thing around eletronics😉
The UPS batteries I saw are sealed lead acid (SLA) types. Aparently, they are spill proof and do not emit gasses.
Vic
Vic
Re: Batteries? Hell Yeah!
Quiescent (idle) current is only between 30-70 milliamps. Using +/- 24 volt supplies, you'll be able to swing about 20-22 volts typically, which into 8 ohms is about 2.75 amps peak.
Just be aware that using two batteries in series will halve their Amphour rating.
It really all depends on how efficient your speakers are and how loud you like to listen. Using some 7.2 Ah batteries, you should be able to get a good 8 hours of them easily. I'm in the habit of switching over to the charger when I'm not listening so I've never really tested to see just how long you can go without a charge in my particular situation. Suffice to say, I've never been interrupted by having to charge the batteries.
Nope.
se
Guiness said:
Quiescent (idle) current is only between 30-70 milliamps. Using +/- 24 volt supplies, you'll be able to swing about 20-22 volts typically, which into 8 ohms is about 2.75 amps peak.
Just be aware that using two batteries in series will halve their Amphour rating.
It really all depends on how efficient your speakers are and how loud you like to listen. Using some 7.2 Ah batteries, you should be able to get a good 8 hours of them easily. I'm in the habit of switching over to the charger when I'm not listening so I've never really tested to see just how long you can go without a charge in my particular situation. Suffice to say, I've never been interrupted by having to charge the batteries.
Nope.
se
I have a very old copy of the “Audel’s New Electric Library”. It’s a little leather bound pocket tradesman’s handbook filled with tons of technology history. If you ever have a chance to get pick one up, whether on radio, electricity, or carpentry, grab it! You wont regret the education. Another great book to grab would be a first edition copy of the “Audio Cyclopedia”.
I mention this because I am sure that in one of these that there is a great section on sound motion picture projection. The article describes the proper operation of the motor generator set, to insure that the lead acid cells are fully charged before the show begins.
I’ll see if I can’t scan it and post it. Might take a few days. Life is a little busy right now.
I mention this because I am sure that in one of these that there is a great section on sound motion picture projection. The article describes the proper operation of the motor generator set, to insure that the lead acid cells are fully charged before the show begins.
I’ll see if I can’t scan it and post it. Might take a few days. Life is a little busy right now.
Re: Re: Batteries? Hell Yeah!
/U.
Steve, two 12V/7,2Ah SLA's in series yield 24V/7,2Ah, and using them in parallel yields 12V/14,4V, right?Steve Eddy said:
/U.
There is a nice IC for charging circuits by TI/Unitrode the UC2906/3906. However I can't seem to work out a proper circuit for charging 8 x 7,2Ah 12V batteries from the application notes.It's abit confusing. Can anyone help?
Another thing that confuses me with batteries is that you would seem to need 4X the Ah for 24V than for 12V according to ohms law. However that may not be absolutely necessary in actual practice if you do not intend to run your amp flat out most of the time. If you are only swinging a few volts most of the time like me ( around 4 to 10V maximum) then this means you might not need so many more batteries if you go from a 12V supply to a 24V supply.Is this correct ?
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