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I design a circuit to charge a similar rechargeable batteries of powerbank battery, if you want to calculate the current, I recommend you calculate the capacitance generated by your circuit because without capacitors can not give power to calculate the voltage obtained must be seen technical data stepper motor, placed at their outputs a multimeter in AC, turn the engine will give a value in voltage, this depente time rotation and touch, the technical data of the motor must come to voltage necessary for many rpm only invests calculations with the data you get your with multimeter
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