Typical in-phase hysteresis comparator circuit diagram

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Photocoupler

Typical in-phase hysteresis comparator circuit

The figure is a typical in-phase hysteresis comparator circuit diagram. Each comparator has two inputs and one output. One of the two inputs is called the non-inverting input, which is represented by "+" and the other is called the inverting input, which is indicated by "-". When comparing two voltages, add a fixed voltage to the reference voltage at any input and add a signal voltage to be compared at the other end. When the voltage at the "+" terminal is higher than the "-" terminal, the output tube is turned off, which is equivalent to an open circuit at the output end. When the voltage at the "-" terminal is higher than the "+" terminal, the output tube is saturated, which is equivalent to the output terminal being connected to a low potential.