After learning that some devices can be charged up wirelessly through inductive means (which https://powerbyproxi.com/wireless-charging/ illustrates), I want to try to invent a simple one myself, but I have a few questions.
For the charger circuit, could I get away with creating a simple one-transistor transmitter? If so, what frequency will I need to set it at and why? and will I always get better results if I use high-value inductors?
I assume for the receiver circuit (circuit to be charged) that the frequency must match, but should the inductance also match or be different?
How is it possible that such technology works if a dead battery powers the receiver? does one have to solely rely on crystal radio technology and have the transmitter almost sandwiched next to the receiver?