An electronic thermometer having: a temperature-sensitive probe and one of two optional electronic circuits, each of which has means for changing a basic comparison voltage in steps or increments through a series of stair-stepped voltages toward the amplified small voltage from the thermistor until the stabilized thermistor voltage and the comparison voltage are equal, and indicating the result in degrees. One of these circuits comprises a stairstep generator, and the other a set of resistors of...

An electronic time-piece is advanced by electronic pulses which are generd by a fixed frequency signal source. In order to correct the indication of the time-piece, a circuit is provided for adding or deleting pulses to thereby increment or decrement the indication. One push-button switch is provided for both adding or subtracting seconds from the indication displayed by the time-piece. Each depression of the push-button adds one second to the indication. When the user depresses the push-button ...

An electronic velocimeter being readily adaptable for measuring the magnitude and direction of a velocity of a moving element. A transducer is responsive to the moving element and produces an output signal having frequency proportional to the velocity of the moving element. A circuit is provided for measuring the variations in frequency and producing a DC output signal as a function thereof.

Devices for prolonging the life of an electric light bulb adapted to fit into a light socket between the central contact of the light socket and the central contact of the light bulb. Disclosed are combinations of rectifying and resistive elements, preferably temperature responsive resistive elements which function to reduce turn-on surges and lower the operating temperature of the bulb filament. Also disclosed is a method of utilizing a printed circuit board to provide physical and electrical m...

An electronic strobe circuit for flash cameras or flash attachments in which a capacitive energy storage circuit is discharged into a flash tube to provide illumination in synchronism with the opening of the camera shutter. The strobe includes a charging circuit for gradually charging the storage circuit toward a predetermined charge level sufficient for illuminating the flash tube to a desired intensity upon opening of the shutter and a charge limiting circuit including a balanceable bridge cou...

This invention relates to a tachometer for detecting the velocity of movement of a moveable member by use of signals indicating passage of that member past predetermined points along the path of movement.

An electronic sensor with lever wherein a lever carrying a feeler is pivoted at the end of a casing, the movements of said feeler being transmitted to the movable element of an electronic transducer by means of a reversing mechanism having two levers whereof the first is fixed to the lever carrying the feeler and pivots about the same shaft as the latter, said mechanism being able to move, counter the action of at least one elastic member, the movable element of the transducer in a same directio...

A battery-sustained multiple level electronic counter is provided which includes an N-bit memory and an address counter and control for the memory. A single bank of a plurality of binary code decimal input switches are provided which are set for preset levels to be stored in the memory utilizing a much smaller number of address-select binary code decimal switches coupled to the address counter. The number of digits of the address-select switches corresponds to the number of preset levels desired...

In an electronic timepiece in which a piezoelectric oscillator acts as a time base and controls a display device through a frequency division chain, the scale of division in the chain is adjustable for regulating the timepiece. A digital comparator compares the logic state of a binary reference with that of specific stages of the division chain, the comparator being alternately blocked during a natural period of the division chain and unblocked during the ensuing period. That ensuing period is c...

There is disclosed herein an electronic photoflash circuit including means for rapidly and accurately terminating a light flash and/or blocking discharge of a photoflash energy storage capacitor. The circuit involves use of a switching device connected in series with a photoflash tube wherein the beginning of ionization of the photoflash tube affects turn on one of the series switching device. Additionally, the circuit includes means for activating a light sensing circuit, and there is disclosed...