A carburetor having a fuel metering restriction is provided with air bleed valving means for varying the pressure at one side of the metering restriction to thereby change the metering pressure differential across the metering restriction and consequently vary the fuel-air ratio of the combustible mixture discharged by the carburetor to reflect changes in engine operating parameters.

A feedback amplifier circuit includes a pair of push-pull amplifiers adapted for driving the deflection plates of a cathode ray tube, with each amplifier being provided with a negative feedback circuit including an active amplifying device. As a result of the employment of an amplifying device in each feedback circuit, the conductive loading of output stages is reduced, and therefore the standing current which must be supplied to the amplifier circuit is also reduced.

A biological feedback system which is particularly useful for the processing of EEG (electroencephalogram) signals. In such use the present system receives a signal from a subject organism and generates an electrical signal in response thereto. Provision is made for detecting the dominant periodicity of this electrical signal, preferably as the time average of zero crossings of the signal about its own average value. A first analog signal is developed having a DC magnitude which is proportional ...

This invention relates to an electrostatic voltmeter which provides accurate measurement of the electrostatic potential of a small surface area, without physical contact therewith. More particularly, it relates to the utilization of solid state elements to provide improved transient response, characterized by superior performance, stability, reliability and ease of maintenance of an electrostatic voltmeter.

System for accurately controlling the closure time of relays by storing the operating characteristics of the individual relays and using the data to determine the necessary activation time.

A velocity feedback circuit for a position servomechanism operative to control the position of a controlled object on the basis of the signal indicative of the difference between the position error and the velocity fed back to the input, wherein a velocity calculating circuit is provided to calculate the velocity to be fed back to the input of the position servomechanism on the basis of the relation between the time required for the controlled variable of the controlled object to make a predeter...

A feedback signal amplifier circuit having switchable closed loop gain in sponse to the output signal level of the amplifier for limiting the output signal level is presented. The feedback ratio of the circuit is switched by output signal level responsive diodes which derive signal level determining bias from both an unregulated power supply and the output terminal of the amplifier. A bias compensation network deriving bias from the unregulated power supply is connected to a bias sensitive input...

A multiple-feedback path bandpass/bandreject filter which exhibits a nearly constant Q over a predetermined frequency range, and which is tunable by means of a single variable impedance element is provided. A Thevenin equivalent voltage source is placed in series with the tuning element, wherein the Thevenin voltage is a predetermined constant fractional amplitude of the bandreject output voltage, or its equivalent.

This invention relates to filtering separators in particular pocket or tube filters, of the kind having a lower inlet for dirty, i.e. dust-or smoke-laden gas containing extremely adherent dust particles which is directed upwards towards the filter elements, the dust which settles when the filter surfaces are cleaned periodically being carried back to the filter surfaces by this dirty gas for agglomeration purposes and a proportion of the agglomerated dust which corresponds to the quantity of dus...

A multiple servo system including two or more servo mechanisms, each having a pressure feed back including two pistons exposed in respective chambers interconnected by a low-pass hydraulic filter, in which the area of the two feedback piston faces differ by up to 25%. This reduces the tendency of the respective actuators to act in opposition and thus increases the service life of the system.