Basic Electronics: Basic Working of Schmitt Trigger Illustrated with Solved Examples

Sometimes your circuit incorporates noisy input signal which causes erratically disturbing behavior.

In such cases, you can use a Schmitt trigger to obtain a perfect wave.

What is Schmitt Trigger

A Schmitt trigger is actually a comparator circuit which uses the positive feedback to implement the hysteresis phenomenon. The feedback is provided to the noninverting input of the differential amplifier. The name trigger is given to the device because the output wave retains its state until a major sufficient change is applied to the input.

Let’s understand the working and details of Schmitt trigger.

How to Design a Schmitt trigger

There are three different ways to obtain a Schmitt trigger.

Integrated circuit: IC are available which can be directly mounted on board.

Bipolar Junction Transistors: Two transistors can be used to obtain a Schmitt trigger. The figure below displays the working and method to obtain it:

Op-Amp: The Op-amp can also be used to obtain ST.

Solved Examples

All About Electronics presents four different solve examples which help you grip the mathematical concepts.

Further Reading

Schmitt trigger Calculations and Formulas: A place where you can find various formulas and calculations as well as basic theory.

555 Timer IC as ST: Understand the use of 555 timers to design it.


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