For a school project, I'm creating a shake-powered phone power bank that will generate current similarly to a Faraday flashlight, which will in turn power a usb port. A simple enough concept.
Now to my (limited) knowledge of electronics, as I understand it, this process of electromagnetic induction will induce an AC current, which I believe can be converted to DC via use of a rectifier. My problem lies in that I'm not sure how to store this charge.
My original idea was to purchase and disassemble a power bank and rewire its input to my "shaker" circuit's DC current. However, I've been advised that without knowing what voltage my shaker will produce, this may not work as well as I'd hoped, and could end up frying the whole circuit.
I know of supercapacitors, but there appears to be a wide range, with varying volts and Farads, of which I don't know what to choose. I would have assumed that more Farads would be better, considering that it is a unit electrical capacitance, which would give the power bank more capacity, however in this video that partially inspired the project idea, the narrator opts to use a 1.5F supercap instead of a 22F one, which has added to my confusion.
(sidenote: if I use a supercap, I'd need to wire the USB port myself, which I'm hoping I can simply take off of the circuit of the store bought power bank, but let me know if that is a bad idea that will just cause more problems)
Hopefully you people a lot smarter than I am can clear up how to go about wiring this thing up. Thank you in advance.