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37CommentsVictorville, CaliforniaJoined May 30th, 2011

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  • tired of dead batteries in your cordless tools? me too! so let's hack away!!

    I have to say for those a little bit electronic component wavy is way better to build your own power supply for a toollike this. Unlike the tools sold as AC wall powered which actually run fine with 48 v of DC power from car batteries, the toolsSold as D.C. Will not happily accept AC power because they are in fact DC motors, so you can't just plu g them in the wal and have them work.Here are the stages of power supply convertor you must make for this to work right. First the AC mains power must enter into a step Down transformer which will ratio the voltage down and the current up by the same factor so if it's a 2:1 step down your wall power changes from 120VAC to 60VAc. And the available current steps up to that times more current that it would produce beforeThat is too high to work w...

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    I have to say for those a little bit electronic component wavy is way better to build your own power supply for a toollike this. Unlike the tools sold as AC wall powered which actually run fine with 48 v of DC power from car batteries, the toolsSold as D.C. Will not happily accept AC power because they are in fact DC motors, so you can't just plu g them in the wal and have them work.Here are the stages of power supply convertor you must make for this to work right. First the AC mains power must enter into a step Down transformer which will ratio the voltage down and the current up by the same factor so if it's a 2:1 step down your wall power changes from 120VAC to 60VAc. And the available current steps up to that times more current that it would produce beforeThat is too high to work with so I know your transformer will more likely be a 6:1 step down transformer so that the voltage come so out ~20V AC on the other end. Then you only need to run the lower voltage AC throuh a bridge rectifier (a set of four diodes typically all connected to each other at one of their ends (look up diagram for this) and lastly add a couple large capacitors in parallel with the output to smooth out the AC humps or "ripple" noise and make the power stable and cleaner which also drops the voltage down by a factor of about 30% putting you in the sweet spot for a D.C. Unit voltage to the drill.

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