the wearable primary coil which is in the exemplary embodiment 4 6 turns of 18 ga stranded wire in order to generate the strong magnetic field efficiently the novel oscillator of the present invention utilizes a very high q tank circuit comprising the wearable primary coil and a small tuning capacitor which has in the exemplary embodiment a q of u02dc 100 by switching in the capacitor the reactance of the primary coil can be changed eliminating the need for prior art methods involving complicated circuitry to change pulse width for achieving desired am modulation as described earlier changes in pulse width are undesirable because they cause significant degradation of efficiency the novel oscillator injects a brief current pulse into the tank circuit only at the time when the current through the wearable primary coil is passing through zero and the voltage across the driving metal oxide semiconductor field effect transistor mosfet of the e class oscillator is at its negative peak which is ground in the novel oscillator circuit the novel oscillator circuit further comprises a feedback circuit comprising an adjustable phase shift and zero crossing detector which compensates for propagation delays in drive circuitry as well as shifts in resonant frequency that may result from deformation of the coil such as when the patient moves all reactive components utilized in embodiments of the present invention are preferably selected to minimize dissipation and could include for example silver mica capacitors highly stranded antenna wire and very fast transistors fig4 and fig5 together illustrate an exemplary bion system architecture fig4 and fig5 are directed to the internal circuitry of an implantable bion and to the external circuitry involving the wearable primary coil respectively power and communication transmissions.