What is a Schmitt Trigger? A Schmitt trigger is a comparator | Basic Electronics
What is a Schmitt Trigger?
A Schmitt trigger is a comparator (not exclusively) circuit that makes use of positive feedback (small changes in the input lead to large changes in the output in the same phase) to implement hysteresis (a fancy word for delayed action) and is used to remove noise from an analog signal while converting it to a digital one.
It was invented way back in 1937 by Otto H. Schmitt (whose legacy is somewhat understated) who called it a ‘thermionic trigger’.
