Abstract: An apparatus for controlling the brightness of one or more light emitting diodes includes a sensing circuit to sense a dimming level of a dimmer. A microprocessor receives from the sensing circuit a signal indicative of the dimming level, and a drive circuit drives the one or more light emitting diodes. The microprocessor is arranged to generate a PWM waveform or current level corresponding to the dimming level and to provide the PWM waveform or current level to the drive circuit.

Abstract: An apparatus for controlling the brightness of one or more light emitting diodes includes a sensing circuit to sense a dimming level of a dimmer. A microprocessor receives from the sensing circuit a signal indicative of the dimming level, and a drive circuit drives the one or more light emitting diodes. The microprocessor is arranged to generate a PWM waveform or current level corresponding to the dimming level and to provide the PWM waveform or current level to the drive circuit.

Abstract: A television receiver includes a microprocessor, a switched mode power supply and a storage capacitor. The storage capacitor supplies standby power to the microprocessor when the television receiver is off and the switched mode power supply is disabled. While the television receiver is off, the microprocessor monitors the capacitor voltage and turns on the switched mode power supply to recharge the capacitor when its voltage level falls to a predetermined minimum. The microprocessor turns off the switched mode power supply when the capacitor voltage indicates that the capacitor has been recharged.

Abstract: A television receiver start-up circuit wherein the conventional start-up transformer is eliminated by initiating horizontal output circuit operation directly from the unregulated B+ driven horizontal driver transformer is disclosed. An astable multivibrator energized by the line referenced unregulated B+ power supply provides a pulsed output to the horizontal driver transformer for initiating oscillation of the horizontal output transistor in initiating television receiver sweep operation.Multivibrator operation is timed out following application of the unregulated B+ thereto for termination of the start-up signal and operation of the horizontal drive circuitry by the television receiver's line isolated power supply in sustaining television receiver operation.