project with 7805ic

seanseanseansean Posts: 4
edited 2019-09-17 - 03:26:33 in Microcontrollers
can anyone help me. i made diy generator with 4.5V ac.tried to make voltage doubler then regulate it using ic7805. then i connected a usb for charging.my problem is that ,the phone i dicate charging but after several minutes bothing happenss.wat should i so or add to my circuit??

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