Algebraic combination of the frequencies of two or more selected modes of piezoelectric crystal resonator vibrations yields a total frequency signal output which has a substantially zero temperature coefficient of frequency.

Dual crystal resonator apparatus

Method of and device for compensating the temperature variation in the oscillation frequency of an oscillator wherein an impedance element, for example, a capacitor coupled to the oscillator is switched between two levels of its value, whereby the temperature variation is compensated for on an average.

Temperature compensated oscillator using temperature controlled continual switching of frequency determining impedance

A miniature variable condenser for and coupled to a quartz crystal vibrator including sandwich type evaporated capacitor sections of a plurality of capacitance, means being provided for selectively varying the total capacitance in a step by step manner by selecting combinations of said capacitor sections.

Crystal oscillator with stepped variable capacitor

Temperature compensating trimmer capacitor for use in crystal oscillator circuits

A rapid pulsing, high intensity, incoherent light is produced by selectively energizing a plurality of discharge lamps with a triggering circuit. Each lamp is connected to a capacitor, and a power supply is electrically connected to all but one of the capacitors. This last named capacitor is electrically connected to a discharge lamp which is electrically connected to the triggering circuit.

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Kinji Fujita

Papers

Temperature compensating device for a crystal oscillator