Abstract: A resonant-circuit, high-frequency electrical power supply for a mass spectrometer has a transductor for magnetically retuning the power supply in response to tuning variations produced by operating variations in the mass spectrometer.

Abstract: A frequency generator module has a first generator circuit and a second generator circuit, the frequencies of these circuits being variable by a physical parameter, especially a distance or angular value, with two coils arranged coaxially at a mutual spacing on linear or curved, tubular coil holders, the inductance of these coils being variable by a core displaceable in the coil holder. The combined generator module is connected by a control circuit to a changeover switch which alternately switches the output of one of the two coils to the input of the frequency generator module. A short-circuit ring is arranged in an axially normal plane between the two coils, for the duration of a specific number of pulses of the generator circuit formed from the coil and the generator module.

Abstract: A position sensing element forms a reactance (inductive or capacitive) in the L/C tuning circuit of an oscillator. The reactance varies as a function of the position of the sensing element relative to a predetermined object. This causes the resonant frequency of the oscillator to vary as a function of the position of the sensing element. The output of the oscillator is squared to provide a square wave signal, the frequency of which is a direct function of the position of the sensing element relative to the predetermined object.

Abstract: A digital position transducer apparatus utilizing a moveable slug-tuned inductor to measure the displacement or movement of a mechanical component. The value of the inductor controls an oscillator's output frequency which is converted to a digital word proportional to the displacement of a mechanical component.

Abstract: The resistance-inductance element used to determine the frequency of the frequency generator in the prior art circuits is replaced by an inductance-capacitance combination. As in the prior art circuits the frequency determining circuit is connected between the output and the inverting input of an operational amplifier to whose direct input a reference voltage is applied. However in the present circuit an inductance is connected from the output to the inverting input of the operational amplifier and a capacitance-resistance circuit is connected in parallel with the inductance. A capacitance connects the inverting input of the operational amplifier to ground potential. Resistors connected from the inverting input to the positive voltage supply and to the output terminal from the inverting input and from the direct input are used to change the slope of the curve of frequency vs. inductance.

Abstract: A circuit arrangement for converting an inductance value into a specific frequency particularly for producing a pressure-dependent frequency fully compensated against variations in temperature for injection systems in internal combustion engines. The circuit arrangement comprises a comparator, the output of which is connected to a series circuit comprising at least one diode, a coil with variable inductance and a temperature-dependent resistor, all connected to a current supply line with the end of the coil opposite the comparator output coupled back to a first input of the comparator. The potential of the second input of the comparator can be affected by the output value of a voltage divider between the two current supply lines and a regenerative feedback line emanating from the output of the comparator. During the operation of the circuit arrangement, a pulse sequence is obtained, the frequency of which is determined by the inductance.

Abstract: This disclosure relates to a pulse generator for triggering successive energy discharges such as in automotive or other ignition systems and the like, which generator comprises a magnetic circuit a portion of which is interrupted by a conductive vane the position of which controls the production of the pulses and at least one winding encircling a portion of said magnetic circuit, means connecting said winding to the output of an amplifying means, said components connected to produce as negative feedback at the input of said amplifying means the total voltage across said winding; the magnetic circuit and electronic circuitry connected thereto being so arranged as to minimize the number of components which must be placed in close physical proximity to the rotating vane, generally in the distributor of the engine, and to also minimize the number of interconnecting leads from the vane location to the balance of the ignition system, thus producing a small, inexpensive and highly accurate pulse generator.

Abstract: The movable core member magnetically coupled to the inductance coil of a variable inductor element is adapted for operation by a monitored displaceable member. Circuitry is provided for effecting a series of inductance coil charge and discharge cycles at a rate determined by the inductance value of the inductance coil as established by the position of the movable core member. Included in this circuitry is a circuit element of the type having two operating conditions which, in one operating condition, is effective to control switching circuitry to establish an inductance coil charge cycle; is switched, when the inductance coil charge current has reached a predetermined level, to the other operating condition in which it is effective to control the switching circuitry to establish an inductance coil discharge cycle and is switched, when the inductance coil discharge current has reduced to a predetermined level, to the original operating condition to initiate another inductance coil charge cycle.

Abstract: The invention concerns a measuring instrument for measuring phase shifts in four terminal electrical networks, where the network whose phase shift is to be measured is connected into the feedback circuit of an R-C phase shifter oscillator, and where the generated frequency depends on the phase shift of the four terminal network and of the RC-phase shifter, and where the circuit is so dimensioned that the following oscillation conditions are satisfied:.phi.(.omega.) + .phi. = 0 (or integral multiples of 2 .pi.)(1).vertline.F (.omega.).vertline..multidot..vertline.H.vertline..multidot.A = 1 (2)where .phi. = phase shift of the network whose phase shift is to be measured.phi.(.omega.) = phase shift of the R-C phase shifterF (.omega.

Abstract: A self exited frequency generator including a parallel resonant circuit with the inductive portion of the resonant circuit comprising a high frequency current transformer in which, in order to match the load with the oscillator tube a slidable ferrite core is inserted into the interior of the primary coil of the high frequency current transformer thereby alleviating the need for adjustable taps on the primary coil.

Abstract: A digital tuning device for accurate selectable tuning of a resonant circuit. The inductive and capacitive elements of the resonant circuit are connected by a transformer device whose turns ratio is variable in accurate digital increments. Since the reflected reactance is related to the square of the turns ratio and since the resonant frequency varies as the inverse square root of the reactance, the resonant frequency of the circuit is directly related to the turns ratio.