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4139842 |
Audible alarm unit
The present invention is an audible alarm unit including a coil, a resistor, an NPN transistor, and a piezoelectric transducer having first and second electrodes and a feedback electrode. The...
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4132964 |
Non-linearity correction in wide range voltage controlled oscillators
A low-Q mechanical resonator is operated in its series resonance mode in a circuit that includes an amplifier and voltage variable phase shifter. As the phase shift is varied, the resonator will...
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4123725 |
Phase locked loop system
A phase locked loop system is described which controls and locks the frequency of a UHF transmitter to a desired frequency without the need for complex circuitry. A voltage controlled oscillator...
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4122404 |
Combination phase detector voltage doubler and low-pass filter for use on a phase-lock loop
A phase detector circuit for use in a phase-lock loop is illustrated wherein a voltage pump is incorporated in the phase detector circuit so as to eliminate the utilization of a comparatively high...
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4112670 |
Electronic timepiece
An electronic timepiece wherein the timekeeping circuitry is formed of bipolar transistors and C-MOS transistors integrated on a single integrated circuit chip substrate is provided. The electronic...
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4107625 |
Transistor crystal oscillator which may be paired for generating a beat frequency
An oscillator circuit comprising a transistor, a piezoelectric element and a D.C. source, such as a battery, said transistor being common collector mounted and said piezoelectric element being...
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4107629 |
Temperature compensator for a crystal oscillator
Crystal oscillators have been provided with a voltage sensitive capacitor or varactor which can be varied to improve the frequency stability of the oscillator over the desired range of temperature....
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4103184 |
Frequency divider with one-phase clock pulse generating circuit
A frequency divider wherein an output from a crystal oscillating circuit comprising a crystal oscillating element and an inverter connected in parallel therewith is sent forth as a one-phase...
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4101848 |
Oscillator
An oscillator for producing an output signal having a predetermined frequency for use in an electronic timepiece. The oscillator comprises a miniature crystal vibrator having a high resonant...
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4096445 |
Electromechanical vibration filter for radar master oscillators
A vibration noise filtering system for use in airborne radar master oscillator, RMO, systems is disclosed. Master and slave crystal oscillators are used, the slave oscillator being phase locked to...
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4096452 |
Temperature compensated crystal oscillator
A temperature-compensated crystal oscillator for correcting frequency variations caused by temperature changes by means of a differential amplifier which detects an unbalanced voltage in a bridge...
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4096496 |
Exposure control circuit for camera
In an exposure control circuit for a camera including a digital control circuit, a crystal oscillator is used as a pulse generator. Between the crystal oscillator and the power source is connected...
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4096444 |
Active integrated circuit
An active circuit is disclosed including an integrated circuit having at least one amplification stage comprising an FET. At least one negative feedback transistor is provided of the same...
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4096451 |
High signal-to-noise ratio negative resistance crystal oscillator
A high signal-to-noise crystal oscillator is provided, including a transistor and a crystal coupled across the input thereof. The oscillator further includes series connected capacitors coupled...
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4088968 |
Frequency linearization and sensitivity equalization of a frequency modulated crystal oscillator
A direct FM modulator includes an oscillator comprising a current conducting device providing amplification to sustain oscillations and a frequency determining circuit connected thereto for...
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4085364 |
Circuit for setting transmission and reception frequencies
A circuit for setting transmission and reception frequencies having a crystal-controlled oscillation circuit with a quartz oscillator, a plurality of capacitors different in capacity connected to...
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4081766 |
Crystal tuned voltage controlled oscillator
A voltage controlled oscillator that is responsive to a crystal which is resonant at a predetermined frequency is provided. A first amplifier having first and second differential outputs is coupled...
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4072912 |
Network for temperature compensation of an AT cut quartz crystal oscillator
A network for temperature compensation of a crystal oscillator over an extended temperature range encompassing two points of inflection of the drift characteristic of an AT cut crystal. The...
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4068461 |
Digital electronic alarm watch
A digital electronic wristwatch is provided with an alarm which includes a piezoelectric crystal mounted to vibrate a watch element. The piezoelectric crystal is supplied with a pair of signals,...
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4068847 |
Chroma and luminance signal generator for video games
Apparatus is described for generating simultaneously luminance and chroma signals in a video game for use with a standard NTSC television receiver. Game object color can be changed on the...
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4065728 |
Crystal oscillator including a pair of push-pull complementary transistor amplifiers
An improved integrated circuit oscillator adapted for crystal-controlled applications eliminates the need for capacitors and duty cycle control circuitry by using a cascaded pair of push-pull...
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4065727 |
Variable frequency oscillator having programmable digital frequency display
A high frequency variable oscillator has its frequency grossly set by a bandswitch and an uncalibrated coarse tuning control and finely tuned by an uncalibrated incremental control. The oscillator...
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4063194 |
Wide-band frequency-controlled crystal oscillator
An oscillator formed of an amplifier with a feedback loop containing two parallel connected crystals in series with a voltage variable capacitance. The two crystals have respective resonance...
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4054848 |
Ultrasonic oscillator
An ultrasonic oscillator, which can be mounted on a vehicle and which enables an oscillating element itself to generate a high ultrasonic energy, comprising a storage battery having one power line...
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4053717 |
Cordless telephone
A cordless telephone including a Touch-tone signal generator module including ten buttons for initiating the generation of telephone switching signals representing ten numeric characters and two...
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4051446 |
Temperature compensating circuit for use with a crystal oscillator
A temperature compensating circuit for use with a crystal oscillator has a first bridge circuit for generating a first DC voltage with a linear functional temperature characteristic, a second...
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4044297 |
Ultrasonic generator with combined oscillator and current regulator
An ultrasonic generator comprising an ultrasonic transducer having a natural frequency at which the dynamic admittance becomes maximum; a main circuit consisting of a switching circuit or first...
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4043109 |
Electronic timepiece
An electronic wristwatch having a quartz crystal vibrator serving as a time standard, a display, and an electronic divider circuit for dividing the high frequency signal supplied by the quartz...
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4044317 |
Crystal controlled square wave oscillator
A crystal controlled square wave oscillator requiring a minimum number of components, exhibiting high frequency stability, and operating at substantially a 50% duty cycle. A quartz crystal dual...
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4039972 |
Crystal controlled logic gate clock pulse generator
A self-triggered clock pulse generator for high frequencies comprising an oscillating quartz crystal which is included in a loop together with a capacitor and a single, non-inverting gate. An...
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4032864 |
Electronic circuit having a misfet as an amplifying element
In an electronic circuit such as MIS oscillation or amplifier circuit in which a MISFET or MISFET's is used as an amplifying element and a bias resistor is provided between input and output sides,...
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4028640 |
Piezo-electric tuning fork oscillation circuit
A piezo-electric tuning fork oscillation circuit including a piezo-electric tuning fork and amplifier units, such as ordinary audio frequency signal amplifier circuits employing transistors,...
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4028638 |
Stabilized crystal controlled oscillator
The invention relates to an oscillator having a positive feedback amplifier circuit the gain of which is controlled in direct opposite relationship to the amplitude of the oscillatory voltage...
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4020627 |
Liquid crystal display electronic watch
A liquid crystal display electronic watch comprises a metal substrate, whose upside and downside surfaces are insulated by a flexible print sheet. A liquid crystal cell and a time keeping decoder...
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4020500 |
Controlled oscillator
A controlled oscillator suitable for construction largely in integrated circuit form includes an oscillating amplifier stage and a regenerative feedback loop including a resonant frequency...
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4016508 |
Electronic timepiece having plural capacitors for selectively adjusting quartz crystal oscillator output frequency
An electronic timepiece has a quartz-crystal oscillator which generates a high frequency output signal and applies it to a divider which divides the signal into a lower frequency output signal...
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4013979 |
CMOS oscillator with first and second MOS transistors of opposed type integrated on the same substrate
CMOS oscillator in which the oscillator circuit comprises a first MOS transistor connected by its source to a first terminal of a voltage supply and biased by the current provided by a second MOS...
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4012700 |
Capacitive adjusting device for a quartz crystal oscillator
A capacitive adjusting device for a quartz crystal oscillator utilizing one of the metallization provided on the quartz crystal as a common electrode for a plurality of capacitors, the second...
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4012647 |
Ultrasonic motors and converters
The invention discloses various embodiments of an ultrasonic motor and converter adapted to be used in home or industrial ultrasonic devices. The ultrasonic motor is generally of a piezoelectric...
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4009451 |
Frequency range selectable oscillator for multichannel communication system
To provide the required multiple channels for an aircraft communications system, a crystal controlled reference oscillator includes a tunable circuit for changing the base reference frequency...
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4007582 |
Method and apparatus for synchronizing an electrodynamic clockwork drive
A circuit for synchronizing an electrodynamic clockwork drive including two inductors and two permanent magnet assemblies which are moved relative to a clockwork drive by a mechanical oscillation...
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4001724 |
Variable high frequency crystal oscillator
A Colpitts type oscillator having a tank circuit including a crystal, a voltage variable capacitor and split capacitors with a first inductance including a coil connected in series with the crystal...
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3999370 |
Temperature compensated electronic timepiece
An electronic timepiece has an oscillator whose frequency varies with temperature and whose output is fed through an adder to a time-count unit-signal former that divides this output and feeds it...
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3996530 |
Butler oscillator
An amplitude limiting amplifier followed by a filter network is interposed between the voltage amplification stage and the impedance matching stage in a Butler oscillator. This allows both the...
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3995233 |
Temperature compensated variable frequency crystal oscillator
A temperature compensated variable oscillator formed of at least two capacitors and a resonator, or vibrator, made of lithium tantalate, in which an inductance element whose inductance value can be...
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3989042 |
Oscillator-exciting system for ultrasonic liquid nebulizer
In an oscillator-exciting system for a ultrasonic liquid nebulizer, a piezo-oscillator element for nebulizing the liquid is electrically connected to a self-exciting oscillating circuit as a...
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3986145 |
Variable reactance circuit including differentially-connected transistor device providing a variable reactance input impedance
A variable reactance circuit is composed of a differential amplifier having first and second emitter-coupled transistors, a reactance element, such as a capacitor, connected between the collector...
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3983484 |
Multichannel signal transmitting and receiving apparatus
A multichannel signal transmitting and receiving apparatus comprises a single reference local oscillator, a phase locked loop including a phase comparator receiving as one input a signal resulting...
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3982210 |
Automatic gain control circuit for a crystal oscillator
A single bipolar transistor crystal oscillator with the bias on the base of the transistor fixed and a second transistor coupled in parallel with the transistor of the oscillator for providing an...
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3980906 |
Ultrasonic motor-converter systems
Ultrasonic systems for use in consumer, and other applications, having electromechanical motor systems providing bursts of ultrasonic mechanical vibration at an applicator repeated at a sonic...
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