Hello, I am working on science fair project in which I am harvesting kinetic energy and converting it into electrical energy to charge an electrical device. However, i would appreciate another opinion on the setup of my circuit. Currently, my setup is as follows: I am using a piezoelectric ceramic disk transducer and am using my own weight to compress the disc. The disc is then connected to a full wave bridge rectifier to convert the AC current to DC. Next, I will store the DC current in a 400 MF 25V capacitor. Then i want the capacitor to be connected straight to the electrical device (3.7 V battery cell phone) via a wire soldered to the phone specific charging wire head (the AC adapter will be removed). I would like to know how i can attach another transducer in parallel and whether the rest of the design will work. Or will a transformer be necessary before the rectifier? I am unsure of the necessity of a transformer since on average 2 volts of electricity will be produced from one compression. Also, if there are any other errors, please let me know. Respond as soon as possible, please and thank you!