Hi
I have been asked by a friend to build a device to keep his phone charged while out walking.
I have built a very nice coil to generate power but im having trouble with a part of the electronics.
My idea is to take the tiny amounts of power generated in the coils and store them in a Super Capacitor(s)
I have found some 20F/2.5v Supercaps at a decent price.
Heres the problem, i know how to make the capaciter charge and then power an led etc, but i dont know how i would go about feeding that power to the phone.
The phone requires a 5v source, and needs to be fairly constant, so i was going to use the supercap to charge up an internal battery (3.7v) this would then be stepped up to 5v for charging the phone.
does anyone have any ideas on how to use a 2.5v capaciter to charge up a 3.7v battery.
the capaciter can only be charged by the coils and its power needs to be transfered to the battery. Once it is in the battery i think i know what to do after this.
Hope my rambling makes sense
I have been asked by a friend to build a device to keep his phone charged while out walking.
I have built a very nice coil to generate power but im having trouble with a part of the electronics.
My idea is to take the tiny amounts of power generated in the coils and store them in a Super Capacitor(s)
I have found some 20F/2.5v Supercaps at a decent price.
Heres the problem, i know how to make the capaciter charge and then power an led etc, but i dont know how i would go about feeding that power to the phone.
The phone requires a 5v source, and needs to be fairly constant, so i was going to use the supercap to charge up an internal battery (3.7v) this would then be stepped up to 5v for charging the phone.
does anyone have any ideas on how to use a 2.5v capaciter to charge up a 3.7v battery.
the capaciter can only be charged by the coils and its power needs to be transfered to the battery. Once it is in the battery i think i know what to do after this.
Hope my rambling makes sense