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GREAT IDEA TO REVIVE CELL PHONE BATTERIES! • GREAT IDEA TO REVIVE CELL PHONE BATTERIES... GREAT IDEA WITH A TRANSFORMER! • GREAT IDEA WITH A TRANSFORMER! GREAT INVENTION WITH A COIL! • GREAT INVENTION WITH A COIL! How to make a voltage inverter with a single transistor! • How to make a voltage inverter with a single transistor!