a driving circuit useful in a magnetic inductive coupling wireless communication system is disclosed . the circuit includes an inductor and capacitor in series selectively coupled to a power source such as a rechargeable battery . the lc circuit is made to resonate in accordance with a frequency shift keying or other protocol . such resonance produces a voltage across the inductor . this voltage is used to create a first voltage either by tapping into the coil , or by providing a transformer . the first voltage is coupled to the rechargeable battery by a diode . when the circuit resonates , and when the first voltage exceeds the voltage of the power source , the diode turns on , thus shunting excess current back to recharge the rechargeable battery . by use of this circuit , energy is conserved . additionally , oscillations can be quickly dampened so as to allow the circuit to transmit at high data rates .