Abstract: A high frequency battery charger operable from a 120 volt AC line power source which is rectified and converted by a blocking oscillator into 20-200 Khz rectified output for battery charging. A sensor for determining full battery charge serves as a power cut off to the battery with provision, if desired, for continued trickle charge of the battery.

Abstract: A power oscillator utilizing one or more field effect transistors in conjunction with a tank circuit.

Abstract: A high frequency power supply with inductive coupling and a SCR starter to light two fluorescent lamps is described. It supplies high frequency square waves to the fluorescent lamp for improved light output, efficiency and stability of operation. The rectified line voltage from a full wave rectifier is fed via a SCR starter to two transistors that form an inverter circuit. The inverter circuit is coupled to a ferrite core autotransformer. The secondary windings of the autotransformer are used to heat the filaments of the electrodes of the fluorescent lamp, and to form a reactive coupling along with inductors for stabilizing the arc discharge of the fluorescent lamp.