convertin variable voltage to constant voltage

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dilipya5

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i have a piezo electric transducer which genertes voltage from -2to 8volts.. i need to convert it into a constant voltage supply of 3.7v to charge a mobile battery . how can i do this???
 

could u just elaborate your answer.........

---------- Post added at 17:47 ---------- Previous post was at 15:50 ----------

hey guys culd someone plz help me out...
 

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