switch detector

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• Detector bar — De*tect or bar (Railroads) A bar, connected with a switch, longer than the distance between any two consecutive wheels of a train (45 to 50 feet), laid inside a rail and operated by the wheels so that the switch cannot be thrown until all the… …   The Collaborative International Dictionary of English

• detector bar — noun : a device used to keep a railroad switch locked in position while a train is passing over it …   Useful english dictionary

• Threshold detector with hysteresis — The threshold detector with hysteresis, very similar to the zero crossing threshold detector, is an electronic circuit consisting of an operational amplifier and a series of resistors that provide hysteresis. Like other detectors, this device… …   Wikipedia

• Metal detector — A U.S. Army soldier uses a metal detector to search for weapons and ammunition in Iraq A metal detector is a device which responds to metal that may not be readily apparent. The simplest form of a metal detector consists of an oscillator… …   Wikipedia

• Smoke detector — A smoke detector is a device that detects smoke, typically as an indicator of fire. Commercial, industrial, and mass residential devices issue a signal to a fire alarm system, while household detectors, known as smoke alarms, generally issue a… …   Wikipedia

• Cat's-whisker detector — Galena cat s whisker detector Precision cat s whisker d …   Wikipedia

• Neutrino detector — The Sudbury Neutrino Observatory, a 12 meter sphere filled with heavy water surrounded by light detectors located 2000 meters below the ground in Sudbury, Ontario, Canada. A neutrino detector is a physics apparatus designed to study neutrinos.… …   Wikipedia

• Proximity detector — Proximity detectors are devices that use mutual capacitance between itself and a nearby human body in order to detect a person s presence. OverviewThe human body is a great capacitor (body capacitance), and the proximity detector s capacitance… …   Wikipedia

• Light switch — A light switch is a switch, most commonly used to operate electric lights, permanently connected equipment, or electrical outlets.In modern homes most lights are operated using switches set in walls, usually 6 10 inches (15 25 cm) away from a… …   Wikipedia

• Zero crossing threshold detector — A zero crossing threshold detector is an electronic circuit that consists of an operational amplifier with an input voltage at its positive input (see circuit diagram). Often used in conjunction with other circuit elements, it usually functions… …   Wikipedia

• Ice detector — An ice detector is an optical transducer probe available for aviation purposes. It has no moving parts, is completely solid and its principle of operation is entirely optical. Intrusive to the airstream and hermetically sealed, it uses un… …   Wikipedia