1 farad power cap question |
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rich_gale
Old Croc Joined: 18 February 2008 Status: Offline Points: 2697 |
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Posted: 09 August 2008 at 5:54pm |
Im in need of a little assistance with power cap selection.
i am currently using a small 12volt sealed lead acid battery to run a tiny little sony amplifier (xm-255nx) on a portable sound system (not in a car) and would like to know if adding a 1 farad capacitor will help the battery by taking care of the high current draws and keeping the current draw of the battery more uniform. its not that the battery runs out of steam on a kickdrum, but i would like to know if the capacity will flatten out the current that gets pulled from the battery itself..
cheers
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Marvin
Young Croc Joined: 28 December 2007 Location: London UK Status: Offline Points: 1029 |
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you will need to charge the cap up say in a car first. i the cap isnt charged then it will also add and drain battery to sustain its charge. the cap works by going inline before the amplifier and it gets it charge from the alternator. when a kickdrum note comes it will pull from a charged capacitor possibly drain it before getting any draw from the battery. if u were to play a mobile system with a capacitior i dont think it will help to be honest. because as i said once drained it will look to the battery to fill it back up. |
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Jake_Fielder
Old Croc Joined: 08 October 2007 Status: Offline Points: 4231 |
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What he means is; will it be better for the 12v battery if the current draw is smoothed out (with a cap).
It will flatten out the current draw (to the battery) but i also doubt it would make any differance tbh.
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_djk_
Old Croc Joined: 23 November 2004 Location: United States Status: Offline Points: 6002 |
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The average current draw from the battery will be the same with a big cap, but it will be able to provide higher peak current.
A battery is a chemical process, and s-l-o-w.
A 100,000µF cap would probably be OK for your small amp. I would also use a 470µF and maybe a 4.7µF mylar cap as well (big caps are slow too).
0.47F at 5.5V for $1.00, use three in series for 150,000µF at 16.5V, a 1000µF/35V electrolytic for $0.15, and a 10µF mylar for $1.
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djk
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