In an electrical control system having equipment at different locations interconnected by a multi-wire cable including a common wire which links points of reference potential for the equipment, a compensating circuit samples current flowing in the common wire such that whenever a potential difference exists between the reference points a current is generated in a compensating wire which is extended to one of the points of reference potential to minimize the current flow in the common wire thereb...

Apparatus for monitoring thermocouples comprises a Wien Bridge Oscillator with the thermocouple connected as a part of the bridge. The oscillator parameters are chosen so that oscillations do not occur during normal operation of the thermocouple. The frequency of oscillations are determined by an RC-network. An indicating device is controlled by the output voltage of the oscillator.

A device for providing a precise calibrating voltage permitting of adjustt to high resolution and great linearity, in which to avoid their influence contact resistances only occur in circuits with current sources.

A combination electrical distribution and power supply unit for recreational vehicles utilizing both AC and DC circuits wherein distribution apparatus such as circuit breakers, fuses, relays and the like are housed within one chamber of the unit, while the major heat generating components, such as a power converter transformer, are housed in a separate chamber of the unit separately ventilated and cooled. The apparatus is manufactured, shipped and installed as a unit, and includes quick attachme...

A miniature switch utilizes a flexible diaphragm which seals the switch. The diaphragm is compressed sealably against a cover by a spring biased inverted cup which compresses the diaphragm outwardly against the cover. The switch is actuated by pressing the diaphragm to displace the cup against the biasing action of the spring. The cup is conductive and bridges across poles of the switch to complete a momentary switch operation.

An electric current control unit to be placed electrically between a current source and an electrically driven member to regulate energy flow from the source. The unit includes a piston head and cylinder of non-conductive material and, in the piston head, an annular ring of an electrically conductive material is carried. A plurality of axially spaced discrete electrically conductive segments are arranged in the cylinder wall. Circuit means connect the source and each of the segments through an i...

A double pole, double throw, lighted push button switch having a switch housing receiving a central support member. A light assembly is provided which can be either independently or dependently connected to an electrical circuit and is mounted on top of the support member. A switch blade assembly is connected to the circuit and mounted within the housing and is movable between a normal position and an unstable position whereby electricity is allowed to flow through a load in the circuit in one p...

A first electronic apparatus is provided with a relay energized at a low voltage, the relay having a contact connected in parallel with a power supply switch for the first electronic apparatus. The first electronic apparatus is further provided with a signal generator circuit for energizing a second electronic apparatus. An output signal generated from a third signal generator circuit of a third electronic apparatus is applied to the coil of the relay of the first electronic apparatus thereby to...

A shift control system is disclosed for use with a multi-stage transmission adapted to be disposed in a plurality of states in which various serial combinations of gears are disposed between an input and an output shaft. Two position solenoid valves are provided to control the engagement of each stage. A manually energized state selector for the transmission may take the form of either a shiftable lever or a plurality of push buttons, only one of which may be engaged at a single time. Pairs of s...

A sequence controller, employing digital techniques, employs clock pulses to energize and deenergize incremental loads sequentially at spaced intervals to correct the deviation of a sensed condition from a setpoint. The clock is inhibited from producing pulses when no deviation requiring correction exists. A feedback provides anticipation for the effect of the energization and deenergization of condition changing loads. Hunting is substantially eliminated.