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Techniques Electric parts

=Introduction= In control theory, a bang–bang controller (2 step or on–off controller), is a feedback controller that switches abruptly between two states. These controllers may be realized in terms of any element that provides hysteresis. They are often used to control a plant that accepts a binary input, for example a furnace that is either completely on or completely off. Most common residential thermostats are bang–bang controllers.

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=References= * [https://en.wikipedia.org/wiki/Bang%E2%80%93bang_control Wikipedia: Bang-bang control]