Abstract: A power supply system for controlling the drive voltages applied to a thin film electroluminescent (TFEL) display panel is disclosed. The system includes a power supply that generates the drive voltages to the TFEL display panel and causes it to emit light. A replaceable or resettable display voltage memory located adjacent the display panel provides the power supply with voltage information specific to the display panel. A feedback circuit measures the light emitted from the display panel. A balancing circuit controls multiple display voltages so that they have the proper relationship with respect to each other. The information from the display voltage memory and the feedback circuit is used by the power supply to control the output of the display voltages.

Abstract: A flowmeter in which first and second sets of electrical signals representative, respectively, of the mass flow rate and the volumetric flow rate of a fluid are used to generate an adjusted mass flow rate signal which is representative of the mass flow rate and which reflects changes in flow rate substantially as they occur. Means are provided to generate a control signal representative of the density of the fluid, the control signal in turn being applied to a multiplier circuit which multiplies the volumetric flow rate signal by the control signal to generate the adjusted mass flow rate signal. The control signal is generated by comparing the first set of signals, which are representative of the mass flow rate, with a delayed portion of the adjusted mass flow rate signal, an inequality between the first set of signals and the adjusted mass flow rate signal resulting in a corresponding change in the magnitude of said control signal.