A differential amplifier having very high common mode rejection is shown. In its simple form four transistors and three constant current sources are connected into a balanced configuration. Balance is automatic so that special component selection is not required.

Disclosed is a high performance logically hazard-free latch circuit compatible with TTL technology. The occurrence of both a clock and data signal provides an inverted data output signal at the output node which is fed back to the base electrode of a multi-emitter transistor. The output node then remains latched at the desired logic level until the occurrence of a subsequent clock signal. Also disclosed are techniques for improving the capabilities of the latch and for accepting additional clock…

A high performance golf tee comprises a stem, a cup-shaped ball receptacle on the top of the stem, and a projection extending outwardly from the ball receptacle a sufficient distance such that when a golf ball is placed on the tee and a golf club is swung at the ball, the golf club contacts the projection and imparts motion to the ball before the golf club makes direct contact with the surface of the golf ball. The contact between the golf club and the projection imparts an initial backspin on t…

Solid ramjet fuels made up of mixture comprising hydroxy terminated polybdiene or the like in combination with other hereinafter specified hydrocarbons are disclosed. When combusted, in the presence of air, the fuels of this invention exhibit combustion efficiencies similar to that of hydroxy terminated polybutadiene alone.

An electronic multi-mode vehicle performance control system selectively provides a digital display of odometer, tachometer, speedometer readings as well as other vehicle performance parameters while avoiding the disadvantages of mechanical systems which are subject to frequent breakdown. Provision is made to signal the operator of the vehicle when a preselected maximum vehicle velocity or engine rpm is being exceeded and furthermore to signal the operator when the engine rpm drops below a preset…

An automatic rhythm performance system is provided with a rhythm pattern changing circuit comprising a white noise source and a sample hold circuit which samples the output of the white noise source in response to a pulse signal occurring at the beginning of every measure of a rhythm to produce a sustained voltage of a sampled value which will be different for every measure. The sample hold circuit voltage is applied to a rhythm selecting circuit to modify the preselected pattern of the rhythm.

A performance learning system is described for a program such as a musical score, a play, or vocal performance. An ensemble rendition of a program is recorded on a first track of a magnetic tape with a particular performance, which normally is a part of the program, being omitted from the prerecorded ensemble rendition. A control track is provided, along side the ensemble rendition on the magnetic tape, with control signals representative of preselected stop locations separating learning segment…

Improved electrotherapeutic apparatus comprises A. an electromagnetic energy radiating head including primary and secondary coils and a capacitor electrically connected across the secondary coil, B. and an input circuit including a source of high frequency oscillations, a power amplifier and a control circuit for creating and transmitting to the head a sequence of pulses of high frequency electrical energy and for controlling the amplitude of the pulses and the intervals therebetween, the pulses…

A portable self-contained testing apparatus is provided for accurately determining the stopping time of a press after the initiating of a STOP signal. The apparatus includes a detector head, a stationary grid, a synchronizing touch switch, and a control box with a digital readout. The detector head is mounted on the press ram to be movable therewith while the stationary grid member is mounted proximate to the detector to allow the detector to scan the grid lines on the grid as the ram moves. The…

A first counter is driven by pulses from a signal generator. A second counter is driven by the output of the signal generator divider by a factor in accordance with the number of cylinders in the engine under test. The output of the second counter is shifted to a register in response to a pulse which is phase synchronized with a predetermined point in the rotation cycle of the engine. The output of the register and the output of the first counter are compared for coincidence, a coincidence signa…