Abstract: Described is a combinational array gas sensor.

Abstract: A drive circuit for an electroluminescent lamp and a novel lamp are disclosed. The drive circuit generates an alternating output voltage which is variable in magnitude and frequency and which may be subjected to automatic closed loop regulation in response to lamp voltage or the intensity of the light generated by the lamp. The electroluminescent lamp includes an integral light sensor for producing signals commensurate with the intensity of the light generated by the lamp.

Abstract: An electroluminescent lamp is energized by being charged to a first polarity voltage level in step-wise fashion over a first period of time and then being discharged and charged to a second polarity voltage level in a time period which is short when compared to the first time period. The charging and discharging of the lamp is controlled by a pair of interconnected pulse generators which provide command signals to respective solid state switches. An inductance is connected in series with one of the switches and the electroluminescent lamp load and a diode are connected in parallel with the inductance in such a manner that the step-wise charging of the lamp occurs each time the switch connected in series with the inductance is opened.

Abstract: A driver for a electroluminous lamp includes a bridge switching circuit comprising four MOSFETS, the lamp and a series connected inductance being connected as the load on the bridge circuit. The switching of the transistors of the bridge circuit is controlled by logic circuitry which generates a two-phase, non-overlapping gating control signal which causes the MOSFETS to be switched in pairs whereby current will flow in alternate directions through the lamp.