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A limit switch with a roller-lever operator; this is installed on a gate on a canal lock, and indicates the position of a gate to a control system A limit switch mounted on a moving part of a bridge In electrical engineering , a limit switch is a switch operated by the motion of a machine part or the presence of an object.
KN2 "Krytron" switch tube, made by EG&G (about 25 mm tall) [1] The krytron is a cold-cathode gas-filled tube intended for use as a very high-speed switch , somewhat similar to the thyratron . It consists of a sealed glass tube with four electrodes .
A noisy Schmitt Trigger input signal near one threshold can cause only one switch in output value, after which it would have to move beyond the other threshold in order to cause another switch. For example, an amplified infrared photodiode may generate an electric signal that switches frequently between its absolute lowest value and its ...
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A Single-Pole, Single-Throw (SPST) mercury switch on millimetre graph paper, device length approximately 1.5 cm Another mercury switch design. A mercury switch is an electrical switch that opens and closes a circuit when a small amount of the liquid metal mercury connects metal electrodes to close the circuit. There are several different basic ...
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