Abstract: Embodiments of the invention provide for a system and method for driving LEDs with consistently good illumination and superior efficiency at lower cost and suitable for use with cheaper LEDs or with LEDs having wide component parameter tolerances over wide operating voltages and temperature variations.

Abstract: A digital control system and method for use in switching type voltage regulators measures the rate of the change and the magnitude of the output voltage to change not only the pulse width but also the frequency of the pulses. A voltage regulator according to the present invention creates a more stable output voltage and responds more quickly to sudden changes in current load than prior analog and digitally controlled systems.

Abstract: Embodiments of the invention provide for circuits for driving LEDs with consistently good illumination and superior efficiency at lower cost and suitable for use with cheaper LEDs or with LEDs having wide component parameter tolerances over wide operating voltages and temperature variations. Circuits disclosed may be, but need not be, embodied on a single semiconductor chip.

Abstract: Embodiments of the invention provide for circuits for driving LEDs with consistently good illumination and superior efficiency at lower cost and suitable for use with cheaper LEDs or with LEDs having wide component parameter tolerances over wide operating voltages and temperature variations. Circuits disclosed may be, but need not be, embodied on a single semiconductor chip.

Abstract: Embodiments of the invention provide for circuits for driving LEDs with consistently good illumination and superior efficiency at lower cost and suitable for use with cheaper LEDs or with LEDs having wide component parameter tolerances over wide operating voltages and temperature variations. Circuits disclosed may be, but need not be, embodied on a single semiconductor chip.

Abstract: A programmable electronic time delay initiator includes a digital time-delay circuit that counts in response to a dual-resonator clock and, at the end of the programmed time delay, gates the pre-stored charge on a capacitor to a semiconductor bridge initiator to fire an explosive. The timer circuit includes a combined crystal/RC oscillator that provides high accuracy oscillations from the crystal or oscillations from the RC components in the event the crystal fails. The timer circuit functions in response to multi-part serial commands delivered on a conventional two-wire path. The timer is initially powered-on to provide power to a capacitor that supplies power to the time-delay and related circuits. An initial ATTENTION pulse initializes the circuitry and starts a watchdog timer that counts a fixed number of clock cycles and resets the logic if a following WRITE, ARM, or FIRE command is not received.

Abstract: A pulsimeter for indicating the average heart beat rate by counting the number of beats occurring during a predetermined period of time, comprising a pulse sensor adapted for flat application against a part of a human body, and an electronic counter and display preferably arranged for being worn on a person's wrist. The electronic counter and display comprise an input processing circuit which receives electrical pulses at the rate of the heart beats from the pulse sensor and which supplies to a counting circuit an electrical signal having n pulses for one heart beat, n being an integer factor of 60 greater than 1 and less than 60. The counting circuit repeatedly counts the pulses from the input processing circuit during the predetermined period of time, the duration of which is 60/n seconds. The counting circuit is reset at the end of each such period of time, just after having transmitted its end counting value to a memory circuit which supplies this value to a display during the whole next period of time.

Abstract: an electronic watch-chronograph comprising a watch portion having an electronic arrangement for the measurement and display of the time of day, and a chronograph portion having an electronic arrangement for the measurement and display of the duration of a period of counted time, the first-mentioned display comprising statically-controlled display elements and the second-mentioned display comprising electroluminescent display elements.