The Schmitt trigger can be used as which of the following?

1. Square-wave generator

2. Comparator

3. Astable multivibrator

Select the correct answer using the code given below.

• The Schmitt trigger can be used as Square-wave generator, Comparator, Astable multivibrator.
• A Schmitt trigger is basically an inverting comparator circuit with positive feedback. The purpose of the Schmitt trigger is to convert any regular or irregular shaped input waveform into a square wave output voltage or pulse. Thus, it can also be called a squaring circuit and can be used as square wave generator.
• Astable multivibrator accomplished by fixing an RC network to the Schmitt trigger circuit in –ve feedback. As we will advance through the section, we will see that the circuit has no stable states and therefore, it also known as the astable multivibrator circuit.
• In electronics, a Schmitt trigger is a comparator circuit with hysteresis implemented by applying positive feedback to the noninverting input of a comparator or differential amplifier.

Hence option 4 is correct