The most important feature of Schmitt triggers is the ability to shape slow-changing input signals into steep, rectangular pulses. At the same time, Schmitt triggers can also use their hysteresis voltage to improve the anti-interference ability of the circuit. It consists of a two-stage DC amplifier with the circuit shown.
The emitters of the two transistors are connected together. The circuit also has two stable states (ie, a bistable circuit), but it is triggered by a potential. Its two steady states are VT1 saturation, VT2 cutoff and VT2 saturation, and VT1 cutoff. The two steady-state mutual conversions depend on the magnitude of the input signal. When the input signal potential reaches the on-potential and remains above the on-potential, the circuit remains at a certain steady state; if the input signal potential drops to the off potential and Maintaining at less than the off potential, the circuit quickly flips and remains in another state, which is commonly used for potential discrimination, amplitude discrimination, and shaping of arbitrary waveforms.
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