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Thread: Mp3 Player charger (help please)

  1. #11
    Newbie Redeyez's Avatar
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    i just tested the battery, and i can pull 5 amps off it, but it drops fast. I hope that with two wired up, 1 amp could go for a bit of time. maybe i would have to go with three? I'm considering getting a switching transformer (i think that's what it's called), so it would be more efficent. (please advise as i'm surly WAY off track here).

  2. #12
    Variable Bitrate rubicon's Avatar
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    Well, as long as you wire them in parallel (as you have been), adding more batteries will decrease the load on each individual battery, and the circuit will last longer while still providing 9V. For example, 2x9V in parallel (assuming 1000mAH [milliamp/hours] per batt) = 2000mAH at 9V - that's 2000 miliamps (2 amps) for a period of one hour. (My numbers are just pulled out of the air, so don't follow my instructions verbatim.)

    A linear regulator is more wasteful (of energy, in the form of heat) than a switching one would be - but is cheaper, and generally smaller. See what kind of life you get out of the 2x9V setup, and if that doesn't work for you, put another 9V in the circuit.

  3. #13
    Newbie Redeyez's Avatar
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    Thanks for all the help rubicon. I apologize for all the stupid questions and appreciate your replies. Thanks for not flaming me, too!
    Current status:
    wtf is a carputer??

  4. #14
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    I was born at Lackland :d

    My Ipod ( the "amazing" shuffle..) has a male usb, and just plugs into the computer to recharge. Pretty much the only neat thing about it. Got it for free so..

  5. #15
    Newbie Redeyez's Avatar
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    how did you get a free shuffle?
    don't really want one, though. dosen't even have a screen!

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