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  • Build Your Own 1-Amp iDevice Charger
    [ame=http://vimeo.com/13835359]Reverse engineering Apple's secret charging methods on Vimeo[/ame]


    The engineer/artist/hacker behind the Minty Boost do-it-yourself USB recharger has figured out Apple's weird and arcane way of identifying which chargers are "supported" or not, allowing any reasonably talented modder to make their own 1-amp recharger for iPhones or anything that uses USB to charge. The technical analysis on the Minty Boost site is probably interesting only to serious wireheads; the video above explains it even more succinctly. By taking apart Apple's charger as well as a third-party battery-powered recharger, Limor "ladyada" Fried found out that supported chargers just clip different sized resistors on the USB data lines.

    Using the first Minty Boost instructions and kits, hobbyists found that newer devices simply displayed the "charger not supported" warning and wouldn't charge. Looking into this, ladyada took into account that smarter USB devices will alert the computer or charger that they are about to draw current in excess of the 500 mA limit of standard USB. Most dumb devices don't do that, though, and ladyada figured that chargers were going to generally not be too smart. So she tore apart chargers for different Apple devices and found that the resistors were placed on the data lines to limit voltage to 2.8V on one line and 2V on the other. Using the same setup on a Minty, it drew 1A immediately. Experimenting further with a TuneJuice battery backup from Griffin, she found resistors limiting voltage to 2V on both lines when she tore that one apart. This forces the iDevice to draw only 500 mA, a much more reasonable draw for the AAA batteries used in the TuneJuice.

    This information was previously available only to charger manufacturers who had signed Apple's restrictive non-disclosure agreement. Hobbyists and smaller manufacturers are now free to make more powerful chargers, and iDevice owners can look forward to an end to the annoying "charging is not supported with this accessory" messages.

    Source: Engadget
    This article was originally published in forum thread: Build Your Own 1-Amp iDevice Charger started by Paul Daniel Ash View original post
    Comments 38 Comments
    1. ihaz3g's Avatar
      ihaz3g -
      lolthis was tupd
    1. yamman's Avatar
      yamman -
      check this out!

      How to make a solar iPod/iPhone charger -aka MightyMintyBoost

      i made one of these. it was super easy and its solar!!
    1. awesomeSlayer's Avatar
      awesomeSlayer -
      Interesting stuff.
    1. pingywon's Avatar
      pingywon -
      Lady ada is particularly awesome. I have met her on more then one occasion and am a huge fan of her arduino work. Im glad she put that video together
    1. one1's Avatar
      one1 -
      Quote Originally Posted by hapishyguy View Post
      Tell me something new. In India every guy in the street corner does that lolz! But its nice that someone actually cared to make a video and post it.
      There are no secrets in India! LOL..... I have noticed.

      Quote Originally Posted by ihaz3g View Post
      lolthis was tupd
      People like you, will pay people like me for the rest of your life.
    1. awesomeSlayer's Avatar
      awesomeSlayer -
      Quote Originally Posted by ihaz3g View Post
      lolthis was tupd
      You can't even call this news "stupid" without spelling it correctly. Epic Fail.
    1. unclebnz's Avatar
      unclebnz -
      She has too much time on her hands. She needs a man
    1. badass1469's Avatar
      badass1469 -
      so by reducing the milliamp' it sucks up less power thus charging longer? if this is the case even if u can get it to a full blown amp it would still charge the same amount cuz the battery has an alloted amount of energy that it can store/carry/supply so it's like pouring water into a glass, do it slow it will fill up in a somewhat long time, but pour it faster it will fill up faster but following this reasoning in the end it will always be the same amount of water in the cup(by water and cup i mean power and battery, of course).

      so altering the amperage in anyway would in turn end up the same no matter what, whether you walk the mile or run it, it will always be a mile no matter what.

      correct me if im wrong, maybe she was just doing this for fun or didn't realize what i stated while she tested her theories and whatnot, or maybe what i stated doesn't apply at all. all im doing here is trying to understand why she is doing this.
    1. one1's Avatar
      one1 -
      Quote Originally Posted by unclebnz View Post
      She has too much time on her hands. She needs a man
      Why? To tone her down and turn her into a baby oven with no extra time to experiment and make her less intelligent so she doesn't burn past your azz at the speed of light? Too late

      Girl is in good shape........ right where she needs to be.

      Quote Originally Posted by badass1469 View Post
      so by reducing the milliamp' it sucks up less power thus charging longer? if this is the case even if u can get it to a full blown amp it would still charge the same amount cuz the battery has an alloted amount of energy that it can store/carry/supply so it's like pouring water into a glass, do it slow it will fill up in a somewhat long time, but pour it faster it will fill up faster but following this reasoning in the end it will always be the same amount of water in the cup(by water and cup i mean power and battery, of course).

      so altering the amperage in anyway would in turn end up the same no matter what, whether you walk the mile or run it, it will always be a mile no matter what.
      You should spend some time here: Ohm's law - Wikipedia, the free encyclopedia

      Change any one factor and it changes the others.
    1. nsachar's Avatar
      nsachar -
      too bad beauty and brains don't come in the same package. but nonetheless, very cool video. enjoyed watching it.
    1. PWNsyst3m's Avatar
      PWNsyst3m -
      Wow im so relieved now that I know an iPhone only charges half as good without a wall socket.
    1. VaderForce's Avatar
      VaderForce -
      Good stuff!
    1. srchino's Avatar
      srchino -
      What's wrong with me? I got turn on by seeing a female working electronics ;-)
    1. moudy's Avatar
      moudy -
      but.... WHO CARES???
      I paid more on data usage to watch this video in HD, than I would have paid for a brand new ipod/iphone charger.
      Add to that the time consuming, and the effort (visual "need glasses after"), that's if you already have the machines :/
    1. santacruzlocal's Avatar
      santacruzlocal -
      Quote Originally Posted by plumoso View Post
      Zzzzzzzzzzzxzzzxzzzzzzzzzzzzz

      What ... Trying to boost up your posts?
    1. Joseph_Prophet's Avatar
      Joseph_Prophet -
      lol! you know you're a nerd when you've watched the entire vid and actually understood it! ^_^
    1. thevmax's Avatar
      thevmax -
      Why, when a charger on ebay is like $5?
    1. reanimationxp's Avatar
      reanimationxp -
      Wow, wish I'd have known about this 2 years ago..

      Oh wait, I did.