Toroidal transformer and inductor configurations are described that allow for greater heat transfer away from internal device components. In the first charging circuit, an overshoot based on a reflected signal generated by an output signal is stored as an electric charge to the capacitor, and in the second charging circuit, an undershoot based on a reflected signal generated by an input signal is charged as an electric charge to the capacitor, whereby the energy of the overshoot and the like is recovered. On termination of that access, an operating context is determined for each of the mobile device applications where possible.