transistor 76 the gate of which is coupled to the 32 7 khz receiver circuit 70 a 32 7 khz signal induced in the secondary coil winding 30 will cause the 32 7 khz receiver circuit 70 to activate turning 34 on 34 the transistor 76 via signal line 78 this will in turn provide a discharge path for the capacitor 74 through the inflator 20 deploying the airbag 18 an alternative to tuned circuits for discrimination of the 96 khz and 32 7 khz secondary side signals is phase locked loop circuitry though not separately illustrated substitution of phase locked loop detection circuitry may be substituted in place of the illustrated tuned receivers 70 and 72 generally a 96 khz signal is induced in the secondary coil winding 30 however upon receipt of an airbag deployment signal via signal line 60 the primary side electronics 28 will interrupt the 96 khz signal and induce a 32 7 khz signal in the secondary coil winding 30 for initiating discharge of the capacitor 74 for deployment of the airbag 18 the portion of the secondary side circuit 32 described thus far is primarily concerned with the transfer of power across an annular gap 11 to power charge a capacitor 74 for storage of energy to deploy an airbag 18 and control of that deployment secondary side electronics 32 utilized for.