Abstract: Current inrush limiting apparatus is disclosed including a power supply circuit (32) which regulates the transmission of power from a source (12) to a load (14). A soft start control (36) controls the power supply to prevent excessive current inrush to the load by causing it to apply power to the load gradually when the power first comes on. A dropout timer (38) monitors the power signal and rapidly resets the soft start control circuit if a power dropout exceeds a predetermined minimum duration. This ensures that excessive current inrush also does not occur following brief power dropouts.

Abstract: The disclosure describes an improved tachometer for displaying the speed of an engine which produces ignition pulses. The tachometer includes a pulse-forming circuit, a meter, and a capacitor connected in series with the meter. A rectifier enables the transmission of a current pulse through the capacitor and meter in response to each timing pulse. A discharge device momentarily interconnects the opposed plates of the capacitor in response to the terminal of each timing pulse, whereby the voltage on the capacitor is dissipated. The meter indicates the speed of the engine by responding to the frequency of the current pulses. The discharge device includes a diode and transistor connected across the capacitor.