Abstract: A battery charger is provided which supplies pulses of charging current to a battery and discharges the battery between each charging pulse. The change in the battery terminal voltage over a predetermined period during each charging pulse is measured, and the pulse charging is terminated when a parameter of the measured voltage change exhibits a predetermined characteristic. Pulse charging may be terminated as a result of the measured voltage change exceeding a predetermined threshold or as a result of the detection of a point of inflexion in the variation of measured voltage change with time.

Abstract: A voltage current transactor including a pair of cross-coupled current generators fed with equal currents from a constant current source. The current generators comprise cascaded bipolar transistor current mirrors in which current magnification is achieved by use of emitter multiplication. The output current is controlled only by the input voltage. Both the input port and output port are isolated in terms of identification (return paths) and while the input port can act on the output port, the reverse is not true. The device functions as a mid-identified current source wherein the current outputs are in anti-phase but independent of each other. The overall transconductance of the circuit can be programmed over a wide range by means of a single external resistor.Typical applications of the transactor to provide linear amplification, differentiation, integration with integration constant and gyrator functions are described.

Abstract: An electronic control system suitable for monitoring operation of an automatic automotive gearbox and for verifying actuation thereof in a correct manner. The control system includes stages corresponding to different gear positions, the stages being switchable between set and reset conditions. A control unit is operable to set a particular stage only when the next adjacent stage already is in a set condition. Electrical signals indicating the existing gearbox position are compared with signals defining which stage of the control system is set and operation of the control unit is inhibited if the compared signals do not correspond.